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## org.springframework.beans.factory.support
Class AbstractBeanFactory

    java.lang.Object
      org.springframework.core.SimpleAliasRegistry
          org.springframework.beans.factory.support.DefaultSingletonBeanRegistry
              org.springframework.beans.factory.support.FactoryBeanRegistrySupport
                  org.springframework.beans.factory.support.AbstractBeanFactory

All Implemented Interfaces:
  BeanFactory, ConfigurableBeanFactory, SingletonBeanRegistry, HierarchicalBeanFactory, AliasRegistry

Direct Known Subclasses:
  AbstractAutowireCapableBeanFactory

    public abstract class AbstractBeanFactory

extends FactoryBeanRegistrySupport
implements ConfigurableBeanFactory

Abstract base class for `BeanFactory` implementations, providing the full capabilities of the `ConfigurableBeanFactory` SPI. Does not assume a listable bean factory: can therefore also be used as base class for bean factory implementations which obtain bean definitions from some backend resource (where bean definition access is an expensive operation).

This class provides a singleton cache (through its base class `DefaultSingletonBeanRegistry`, singleton/prototype determination, `FactoryBean` handling, aliases, bean definition merging for child bean definitions, and bean destruction (`DisposableBean` interface, custom destroy methods). Furthermore, it can manage a bean factory hierarchy (delegating to the parent in case of an unknown bean), through implementing the `HierarchicalBeanFactory` interface.

The main template methods to be implemented by subclasses are `getBeanDefinition(java.lang.String)` and `createBean(java.lang.String, org.springframework.beans.factory.support.RootBeanDefinition, java.lang.Object[])`, retrieving a bean definition for a given bean name and creating a bean instance for a given bean definition, respectively. Default implementations of those operations can be found in `DefaultListableBeanFactory` and `AbstractAutowireCapableBeanFactory`.

Since:
  15 April 2001
Author:
  Rod Johnson, Juergen Hoeller
See Also:
  `getBeanDefinition(java.lang.String)`, `createBean(java.lang.String, org.springframework.beans.factory.support.RootBeanDefinition, java.lang.Object[])`, `AbstractAutowireCapableBeanFactory.createBean(java.lang.Class)`, `DefaultListableBeanFactory.getBeanDefinition(java.lang.String)`

Field Summary

Fields inherited from class org.springframework.beans.factory.support.DefaultSingletonBeanRegistry
`logger, NULL_OBJECT`

Fields inherited from interface org.springframework.beans.factory.config.ConfigurableBeanFactory
`SCOPE_PROTOTYPE, SCOPE_SINGLETON`

Fields inherited from interface org.springframework.beans.factory.BeanFactory
`FACTORY_BEAN_PREFIX`

Constructor Summary
`AbstractBeanFactory()` Create a new AbstractBeanFactory.
`AbstractBeanFactory(BeanFactory parentBeanFactory)` Create a new AbstractBeanFactory with the given parent.

Method Summary
`void` | `addBeanPostProcessor(BeanPostProcessor beanPostProcessor)` Add a new BeanPostProcessor that will get applied to beans created by this factory.
`void` | `addPropertyEditorRegistrar(PropertyEditorRegistrar registrar)` Add a PropertyEditorRegistrar to be applied to all bean creation processes.
`protected void` | `afterPrototypeCreation(String beanName)` Callback after prototype creation.
`protected void` | `beforePrototypeCreation(String beanName)` Callback before prototype creation.
`protected void` | `checkMergedBeanDefinition(RootBeanDefinition mbd, String beanName, Object[] args)` Check the given merged bean definition, potentially throwing validation exceptions.
`protected void` | `clearMergedBeanDefinition(String beanName)` Remove the merged bean definition for the specified bean, recreating it on next access.
`boolean` | `containsBean(String name)` Does this bean factory contain a bean with the given name?
`protected abstract boolean` | `containsBeanDefinition(String beanName)` Check if this bean factory contains a bean definition with the given name.
`boolean` | `containsLocalBean(String name)` Return whether the local bean factory contains a bean of the given name, ignoring beans defined in ancestor contexts.
`void` | `copyConfigurationFrom(ConfigurableBeanFactory otherFactory)` Copy all relevant configuration from the given other factory.
`protected abstract Object` | `createBean(String beanName, RootBeanDefinition mbd, Object[] args)` Create a bean instance for the given bean definition.
`void` | `destroyBean(String beanName, Object beanInstance)` Destroy the given bean instance (usually a prototype instance obtained from this factory) according to its bean definition.
`protected void` | `destroyBean(String beanName, Object beanInstance, RootBeanDefinition mbd)` Destroy the given bean instance (usually a prototype instance obtained from this factory) according to the given bean definition.
`void` | `destroyScopedBean(String beanName)` Destroy the specified scoped bean in the current target scope, if any.
`protected Object` | `doGetBean(String name, Class requiredType, Object[] args, boolean typeCheckOnly)` Return an instance, which may be shared or independent, of the specified bean.
`String[]` | `getAliases(String name)` Return the aliases for the given name, if defined.
`Object` | `getBean(String name)` Return an instance, which may be shared or independent, of the specified bean.
`Object` | `getBean(String name, Class requiredType)` Return an instance, which may be shared or independent, of the specified bean.
`Object` | `getBean(String name, Class requiredType, Object[] args)` Return an instance, which may be shared or independent, of the specified bean.
`Object` | `getBean(String name, Object[] args)` Return an instance, which may be shared or independent, of the specified bean.
`ClassLoader` | `getBeanClassLoader()` Return this factory's class loader for loading bean classes.
`protected abstract BeanDefinition` | `getBeanDefinition(String beanName)` Return the bean definition for the given bean name.
`int` | `getBeanPostProcessorCount()` Return the current number of registered BeanPostProcessors, if any.
`List` | `getBeanPostProcessors()` Return the list of BeanPostProcessors that will get applied to beans created with this factory.
`Map` | `getCustomEditors()` Return the map of custom editors, with Classes as keys and PropertyEditor instances or PropertyEditor classes as values.
`protected TypeConverter` | `getCustomTypeConverter()` Return the custom TypeConverter to use, if any.
`BeanDefinition` | `getMergedBeanDefinition(String name)` Return a 'merged' BeanDefinition for the given bean name, merging a child bean definition with its parent if necessary.
`protected RootBeanDefinition` | `getMergedBeanDefinition(String beanName, BeanDefinition bd)` Return a RootBeanDefinition for the given top-level bean, by merging with the parent if the given bean's definition is a child bean definition.
`protected RootBeanDefinition` | `getMergedBeanDefinition(String beanName, BeanDefinition bd, BeanDefinition containingBd)` Return a RootBeanDefinition for the given bean, by merging with the parent if the given bean's definition is a child bean definition.
`protected RootBeanDefinition` | `getMergedLocalBeanDefinition(String beanName)` Return a merged RootBeanDefinition, traversing the parent bean definition if the specified bean corresponds to a child bean definition.
`protected Object` | `getObjectForBeanInstance(Object beanInstance, String name, String beanName, RootBeanDefinition mbd)` Get the object for the given bean instance, either the bean instance itself or its created object in case of a FactoryBean.
`BeanFactory` | `getParentBeanFactory()` Return the parent bean factory, or `null` if there is none.
`Set` | `getPropertyEditorRegistrars()` Return the set of PropertyEditorRegistrars.
`Scope` | `getRegisteredScope(String scopeName)` Return the Scope implementation for the given scope name, if any.
`String[]` | `getRegisteredScopeNames()` Return the names of all currently registered scopes.
`ClassLoader` | `getTempClassLoader()` Return the temporary ClassLoader to use for type matching purposes, if any.
`Class` | `getType(String name)` Determine the type of the bean with the given name.
`TypeConverter` | `getTypeConverter()` Obtain a type converter as used by this BeanFactory.
`protected Class` | `getTypeForFactoryBean(String beanName, RootBeanDefinition mbd)` Determine the bean type for the given FactoryBean definition, as far as possible.
`protected boolean` | `hasDestructionAwareBeanPostProcessors()` Return whether this factory holds a DestructionAwareBeanPostProcessor that will get applied to singleton beans on shutdown.
`protected boolean` | `hasInstantiationAwareBeanPostProcessors()` Return whether this factory holds a InstantiationAwareBeanPostProcessor that will get applied to singleton beans on shutdown.
`protected void` | `initBeanWrapper(BeanWrapper bw)` Initialize the given BeanWrapper with the custom editors registered with this factory.
`protected boolean` | `isBeanEligibleForMetadataCaching(String beanName)` Determine whether the specified bean is eligible for having its bean definition metadata cached.
`boolean` | `isBeanNameInUse(String beanName)` Determine whether the given bean name is already in use within this factory, i.e. whether there is a local bean or alias registered under this name or an inner bean created with this name.
`boolean` | `isCacheBeanMetadata()` Return whether to cache bean metadata such as given bean definitions (in merged fashion) and resolved bean classes.
`boolean` | `isCurrentlyInCreation(String beanName)` Determine whether the specified bean is currently in creation.
`boolean` | `isFactoryBean(String name)` Determine whether the bean with the given name is a FactoryBean.
`protected boolean` | `isFactoryBean(String beanName, RootBeanDefinition mbd)` Check whether the given bean is defined as a `FactoryBean`.
`boolean` | `isPrototype(String name)` Is this bean a prototype?
`protected boolean` | `isPrototypeCurrentlyInCreation(String beanName)` Return whether the specified prototype bean is currently in creation (within the current thread).
`boolean` | `isSingleton(String name)` Is this bean a shared singleton?
`boolean` | `isTypeMatch(String name, Class targetType)` Check whether the bean with the given name matches the specified type.
`protected void` | `markBeanAsCreated(String beanName)` Mark the specified bean as already created (or about to be created).
`protected String` | `originalBeanName(String name)` Determine the original bean name, resolving locally defined aliases to canonical names.
`protected Class` | `predictBeanType(String beanName, RootBeanDefinition mbd, Class[] typesToMatch)` Predict the eventual bean type (of the processed bean instance) for the specified bean.
`void` | `registerCustomEditor(Class requiredType, Class propertyEditorClass)` Register the given custom property editor for all properties of the given type.
`void` | `registerCustomEditor(Class requiredType, PropertyEditor propertyEditor)` Register the given custom property editor for all properties of the given type.
`protected void` | `registerCustomEditors(PropertyEditorRegistry registry)` Initialize the given PropertyEditorRegistry with the custom editors registered with this BeanFactory.
`protected void` | `registerDisposableBeanIfNecessary(String beanName, Object bean, RootBeanDefinition mbd)` Add the given bean to the list of disposable beans in this factory, registering its DisposableBean interface and/or the given destroy method to be called on factory shutdown (if applicable).
`void` | `registerScope(String scopeName, Scope scope)` Register the given scope, backed by the given Scope implementation.
`protected boolean` | `removeSingletonIfCreatedForTypeCheckOnly(String beanName)` Remove the singleton instance (if any) for the given bean name, but only if it hasn't been used for other purposes than type checking.
`protected boolean` | `requiresDestruction(Object bean, RootBeanDefinition mbd)` Determine whether the given bean requires destruction on shutdown.
`protected Class` | `resolveBeanClass(RootBeanDefinition mbd, String beanName)` Resolve the bean class for the specified bean definition, resolving a bean class name into a Class reference (if necessary) and storing the resolved Class in the bean definition for further use.
`protected Class` | `resolveBeanClass(RootBeanDefinition mbd, String beanName, Class[] typesToMatch)` Resolve the bean class for the specified bean definition, resolving a bean class name into a Class reference (if necessary) and storing the resolved Class in the bean definition for further use.
`void` | `setBeanClassLoader(ClassLoader beanClassLoader)` Set the class loader to use for loading bean classes.
`void` | `setCacheBeanMetadata(boolean cacheBeanMetadata)` Set whether to cache bean metadata such as given bean definitions (in merged fashion) and resolved bean classes.
`void` | `setParentBeanFactory(BeanFactory parentBeanFactory)` Set the parent of this bean factory.
`void` | `setTempClassLoader(ClassLoader tempClassLoader)` Specify a temporary ClassLoader to use for type matching purposes.
`void` | `setTypeConverter(TypeConverter typeConverter)` Set a custom type converter that this BeanFactory should use for converting bean property values, constructor argument values, etc.
`protected String` | `transformedBeanName(String name)` Return the bean name, stripping out the factory dereference prefix if necessary, and resolving aliases to canonical names.

Methods inherited from class org.springframework.beans.factory.support.FactoryBeanRegistrySupport
`getCachedObjectForFactoryBean, getFactoryBean, getObjectFromFactoryBean, getTypeForFactoryBean, postProcessObjectFromFactoryBean, removeSingleton`

Methods inherited from class org.springframework.beans.factory.support.DefaultSingletonBeanRegistry
`addSingleton, addSingletonFactory, afterSingletonCreation, beforeSingletonCreation, containsSingleton, destroyBean, destroySingleton, destroySingletons, getDependenciesForBean, getDependentBeans, getSingleton, getSingleton, getSingleton, getSingletonCount, getSingletonMutex, getSingletonNames, hasDependentBean, isSingletonCurrentlyInCreation, onSuppressedException, registerDependentBean, registerDisposableBean, registerSingleton`

Methods inherited from class org.springframework.core.SimpleAliasRegistry
`allowAliasOverriding, canonicalName, isAlias, registerAlias, removeAlias, resolveAliases`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.springframework.beans.factory.config.ConfigurableBeanFactory
`destroySingletons, getDependenciesForBean, getDependentBeans, registerAlias, registerDependentBean, resolveAliases`

Methods inherited from interface org.springframework.beans.factory.config.SingletonBeanRegistry
`containsSingleton, getSingleton, getSingletonCount, getSingletonNames, registerSingleton`

Constructor Detail

### AbstractBeanFactory

    public AbstractBeanFactory()

  Create a new AbstractBeanFactory.

### AbstractBeanFactory

    public AbstractBeanFactory(BeanFactory parentBeanFactory)

  Create a new AbstractBeanFactory with the given parent.

  Parameters:
    `parentBeanFactory` - parent bean factory, or `null` if none
  See Also:
    `getBean(java.lang.String)`

Method Detail

### getBean

    public Object getBean(String name)
                   throws BeansException

  Description copied from interface: `BeanFactory`
  Return an instance, which may be shared or independent, of the specified bean.

  This method allows a Spring BeanFactory to be used as a replacement for the Singleton or Prototype design pattern. Callers may retain references to returned objects in the case of Singleton beans.

  Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

  Specified by:
    `getBean` in interface `BeanFactory`
  Parameters:
    `name` - the name of the bean to retrieve
  Returns:
    an instance of the bean
  Throws:
    `NoSuchBeanDefinitionException` - if there is no bean definition with the specified name
    `BeansException` - if the bean could not be obtained

### getBean

    public Object getBean(String name,
                          Class requiredType)
                   throws BeansException

  Description copied from interface: `BeanFactory`
  Return an instance, which may be shared or independent, of the specified bean.

  Behaves the same as `BeanFactory.getBean(String)`, but provides a measure of type safety by throwing a BeanNotOfRequiredTypeException if the bean is not of the required type. This means that ClassCastException can't be thrown on casting the result correctly, as can happen with `BeanFactory.getBean(String)`.

  Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

  Specified by:
    `getBean` in interface `BeanFactory`
  Parameters:
    `name` - the name of the bean to retrieve
    `requiredType` - type the bean must match. Can be an interface or superclass of the actual class, or `null` for any match. For example, if the value is `Object.class`, this method will succeed whatever the class of the returned instance.
  Returns:
    an instance of the bean
  Throws:
    `NoSuchBeanDefinitionException` - if there's no such bean definition
    `BeanNotOfRequiredTypeException` - if the bean is not of the required type
    `BeansException` - if the bean could not be created

### getBean

    public Object getBean(String name,
                          Object[] args)
                   throws BeansException

  Description copied from interface: `BeanFactory`
  Return an instance, which may be shared or independent, of the specified bean.

  Allows for specifying explicit constructor arguments / factory method arguments, overriding the specified default arguments (if any) in the bean definition.

  Specified by:
    `getBean` in interface `BeanFactory`
  Parameters:
    `name` - the name of the bean to retrieve
    `args` - arguments to use if creating a prototype using explicit arguments to a static factory method. It is invalid to use a non-null args value in any other case.
  Returns:
    an instance of the bean
  Throws:
    `NoSuchBeanDefinitionException` - if there's no such bean definition
    `BeanDefinitionStoreException` - if arguments have been given but the affected bean isn't a prototype
    `BeansException` - if the bean could not be created

### getBean

    public Object getBean(String name,
                          Class requiredType,
                          Object[] args)
                   throws BeansException

  Return an instance, which may be shared or independent, of the specified bean.

  Parameters:
    `name` - the name of the bean to retrieve
    `requiredType` - the required type of the bean to retrieve
    `args` - arguments to use if creating a prototype using explicit arguments to a static factory method. It is invalid to use a non-null args value in any other case.
  Returns:
    an instance of the bean
  Throws:
    `BeansException` - if the bean could not be created

### doGetBean

    protected Object doGetBean(String name,
                               Class requiredType,
                               Object[] args,
                               boolean typeCheckOnly)
                        throws BeansException

  Return an instance, which may be shared or independent, of the specified bean.

  Parameters:
    `name` - the name of the bean to retrieve
    `requiredType` - the required type of the bean to retrieve
    `args` - arguments to use if creating a prototype using explicit arguments to a static factory method. It is invalid to use a non-null args value in any other case.
    `typeCheckOnly` - whether the instance is obtained for a type check, not for actual use
  Returns:
    an instance of the bean
  Throws:
    `BeansException` - if the bean could not be created

### containsBean

    public boolean containsBean(String name)

  Description copied from interface: `BeanFactory`
  Does this bean factory contain a bean with the given name? More specifically, is `BeanFactory.getBean(java.lang.String)` able to obtain a bean instance for the given name?

  Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

  Specified by:
    `containsBean` in interface `BeanFactory`
  Parameters:
    `name` - the name of the bean to query
  Returns:
    whether a bean with the given name is defined

### isSingleton

    public boolean isSingleton(String name)
                        throws NoSuchBeanDefinitionException

  Description copied from interface: `BeanFactory`
  Is this bean a shared singleton? That is, will `BeanFactory.getBean(java.lang.String)` always return the same instance?

  Note: This method returning `false` does not clearly indicate independent instances. It indicates non-singleton instances, which may correspond to a scoped bean as well. Use the `BeanFactory.isPrototype(java.lang.String)` operation to explicitly check for independent instances.

  Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

  Specified by:
    `isSingleton` in interface `BeanFactory`
  Parameters:
    `name` - the name of the bean to query
  Returns:
    whether this bean corresponds to a singleton instance
  Throws:
    `NoSuchBeanDefinitionException` - if there is no bean with the given name
  See Also:
    `BeanFactory.getBean(java.lang.String)`, `BeanFactory.isPrototype(java.lang.String)`

### isPrototype

    public boolean isPrototype(String name)
                        throws NoSuchBeanDefinitionException

  Description copied from interface: `BeanFactory`
  Is this bean a prototype? That is, will `BeanFactory.getBean(java.lang.String)` always return independent instances?

  Note: This method returning `false` does not clearly indicate a singleton object. It indicates non-independent instances, which may correspond to a scoped bean as well. Use the `BeanFactory.isSingleton(java.lang.String)` operation to explicitly check for a shared singleton instance.

  Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

  Specified by:
    `isPrototype` in interface `BeanFactory`
  Parameters:
    `name` - the name of the bean to query
  Returns:
    whether this bean will always deliver independent instances
  Throws:
    `NoSuchBeanDefinitionException` - if there is no bean with the given name
  See Also:
    `BeanFactory.getBean(java.lang.String)`, `BeanFactory.isSingleton(java.lang.String)`

### isTypeMatch

    public boolean isTypeMatch(String name,
                               Class targetType)
                        throws NoSuchBeanDefinitionException

  Description copied from interface: `BeanFactory`
  Check whether the bean with the given name matches the specified type. More specifically, check whether a `BeanFactory.getBean(java.lang.String)` call for the given name would return an object that is assignable to the specified target type.

  Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

  Specified by:
    `isTypeMatch` in interface `BeanFactory`
  Parameters:
    `name` - the name of the bean to query
    `targetType` - the type to match against
  Returns:
    `true` if the bean type matches, `false` if it doesn't match or cannot be determined yet
  Throws:
    `NoSuchBeanDefinitionException` - if there is no bean with the given name
  See Also:
    `BeanFactory.getBean(java.lang.String)`, `BeanFactory.getType(java.lang.String)`

### getType

    public Class getType(String name)
                  throws NoSuchBeanDefinitionException

  Description copied from interface: `BeanFactory`
  Determine the type of the bean with the given name. More specifically, determine the type of object that `BeanFactory.getBean(java.lang.String)` would return for the given name.

  For a `FactoryBean`, return the type of object that the FactoryBean creates, as exposed by `FactoryBean.getObjectType()`.

  Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

  Specified by:
    `getType` in interface `BeanFactory`
  Parameters:
    `name` - the name of the bean to query
  Returns:
    the type of the bean, or `null` if not determinable
  Throws:
    `NoSuchBeanDefinitionException` - if there is no bean with the given name
  See Also:
    `BeanFactory.getBean(java.lang.String)`, `BeanFactory.isTypeMatch(java.lang.String, java.lang.Class)`

### getAliases

    public String[] getAliases(String name)

  Description copied from interface: `AliasRegistry`
  Return the aliases for the given name, if defined.

  Specified by:
    `getAliases` in interface `BeanFactory`
  Specified by:
    `getAliases` in interface `AliasRegistry`
  Overrides:
    `getAliases` in class `SimpleAliasRegistry`
  Parameters:
    `name` - the name to check for aliases
  Returns:
    the aliases, or an empty array if none
  See Also:
    `BeanFactory.getBean(java.lang.String)`

### getParentBeanFactory

    public BeanFactory getParentBeanFactory()

  Description copied from interface: `HierarchicalBeanFactory`
  Return the parent bean factory, or `null` if there is none.

  Specified by:
    `getParentBeanFactory` in interface `HierarchicalBeanFactory`

### containsLocalBean

    public boolean containsLocalBean(String name)

  Description copied from interface: `HierarchicalBeanFactory`
  Return whether the local bean factory contains a bean of the given name, ignoring beans defined in ancestor contexts.

  This is an alternative to `containsBean`, ignoring a bean of the given name from an ancestor bean factory.

  Specified by:
    `containsLocalBean` in interface `HierarchicalBeanFactory`
  Parameters:
    `name` - the name of the bean to query
  Returns:
    whether a bean with the given name is defined in the local factory
  See Also:
    `BeanFactory.containsBean(java.lang.String)`

### setParentBeanFactory

    public void setParentBeanFactory(BeanFactory parentBeanFactory)

  Description copied from interface: `ConfigurableBeanFactory`
  Set the parent of this bean factory.

  Note that the parent cannot be changed: It should only be set outside a constructor if it isn't available at the time of factory instantiation.

  Specified by:
    `setParentBeanFactory` in interface `ConfigurableBeanFactory`
  Parameters:
    `parentBeanFactory` - the parent BeanFactory
  See Also:
    `HierarchicalBeanFactory.getParentBeanFactory()`

### setBeanClassLoader

    public void setBeanClassLoader(ClassLoader beanClassLoader)

  Description copied from interface: `ConfigurableBeanFactory`
  Set the class loader to use for loading bean classes. Default is the thread context class loader.

  Note that this class loader will only apply to bean definitions that do not carry a resolved bean class yet. This is the case as of Spring 2.0 by default: Bean definitions only carry bean class names, to be resolved once the factory processes the bean definition.

  Specified by:
    `setBeanClassLoader` in interface `ConfigurableBeanFactory`
  Parameters:
    `beanClassLoader` - the class loader to use, or `null` to suggest the default class loader

### getBeanClassLoader

    public ClassLoader getBeanClassLoader()

  Description copied from interface: `ConfigurableBeanFactory`
  Return this factory's class loader for loading bean classes.

  Specified by:
    `getBeanClassLoader` in interface `ConfigurableBeanFactory`

### setTempClassLoader

    public void setTempClassLoader(ClassLoader tempClassLoader)

  Description copied from interface: `ConfigurableBeanFactory`
  Specify a temporary ClassLoader to use for type matching purposes. Default is none, simply using the standard bean ClassLoader.

  A temporary ClassLoader is usually just specified if load-time weaving is involved, to make sure that actual bean classes are loaded as lazily as possible. The temporary loader is then removed once the BeanFactory completes its bootstrap phase.

  Specified by:
    `setTempClassLoader` in interface `ConfigurableBeanFactory`

### getTempClassLoader

    public ClassLoader getTempClassLoader()

  Description copied from interface: `ConfigurableBeanFactory`
  Return the temporary ClassLoader to use for type matching purposes, if any.

  Specified by:
    `getTempClassLoader` in interface `ConfigurableBeanFactory`

### setCacheBeanMetadata

    public void setCacheBeanMetadata(boolean cacheBeanMetadata)

  Description copied from interface: `ConfigurableBeanFactory`
  Set whether to cache bean metadata such as given bean definitions (in merged fashion) and resolved bean classes. Default is on.

  Turn this flag off to enable hot-refreshing of bean definition objects and in particular bean classes. If this flag is off, any creation of a bean instance will re-query the bean class loader for newly resolved classes.

  Specified by:
    `setCacheBeanMetadata` in interface `ConfigurableBeanFactory`

### isCacheBeanMetadata

    public boolean isCacheBeanMetadata()

  Description copied from interface: `ConfigurableBeanFactory`
  Return whether to cache bean metadata such as given bean definitions (in merged fashion) and resolved bean classes.

  Specified by:
    `isCacheBeanMetadata` in interface `ConfigurableBeanFactory`

### addPropertyEditorRegistrar

    public void addPropertyEditorRegistrar(PropertyEditorRegistrar registrar)

  Description copied from interface: `ConfigurableBeanFactory`
  Add a PropertyEditorRegistrar to be applied to all bean creation processes.

  Such a registrar creates new PropertyEditor instances and registers them on the given registry, fresh for each bean creation attempt. This avoids the need for synchronization on custom editors; hence, it is generally preferable to use this method instead of `ConfigurableBeanFactory.registerCustomEditor(java.lang.Class, java.lang.Class)`.

  Specified by:
    `addPropertyEditorRegistrar` in interface `ConfigurableBeanFactory`
  Parameters:
    `registrar` - the PropertyEditorRegistrar to register

### getPropertyEditorRegistrars

    public Set getPropertyEditorRegistrars()

  Return the set of PropertyEditorRegistrars.

### registerCustomEditor

    public void registerCustomEditor(Class requiredType,
                                     Class propertyEditorClass)

  Description copied from interface: `ConfigurableBeanFactory`
  Register the given custom property editor for all properties of the given type. To be invoked during factory configuration.

  Note that this method will register a shared custom editor instance; access to that instance will be synchronized for thread-safety. It is generally preferable to use `ConfigurableBeanFactory.addPropertyEditorRegistrar(org.springframework.beans.PropertyEditorRegistrar)` instead of this method, to avoid for the need for synchronization on custom editors.

  Specified by:
    `registerCustomEditor` in interface `ConfigurableBeanFactory`
  Parameters:
    `requiredType` - type of the property
    `propertyEditorClass` - the `PropertyEditor` class to register

### registerCustomEditor

    public void registerCustomEditor(Class requiredType,
                                     PropertyEditor propertyEditor)

  Description copied from interface: `ConfigurableBeanFactory`
  Register the given custom property editor for all properties of the given type. To be invoked during factory configuration.

  Note that this method will register a shared custom editor instance; access to that instance will be synchronized for thread-safety. It is generally preferable to use `ConfigurableBeanFactory.addPropertyEditorRegistrar(org.springframework.beans.PropertyEditorRegistrar)` instead of this method, to avoid for the need for synchronization on custom editors.

  Specified by:
    `registerCustomEditor` in interface `ConfigurableBeanFactory`
  Parameters:
    `requiredType` - type of the property
    `propertyEditor` - editor to register

### getCustomEditors

    public Map getCustomEditors()

  Return the map of custom editors, with Classes as keys and PropertyEditor instances or PropertyEditor classes as values.

### setTypeConverter

    public void setTypeConverter(TypeConverter typeConverter)

  Description copied from interface: `ConfigurableBeanFactory`
  Set a custom type converter that this BeanFactory should use for converting bean property values, constructor argument values, etc.

  This will override the default PropertyEditor mechanism and hence make any custom editors or custom editor registrars irrelevant.

  Specified by:
    `setTypeConverter` in interface `ConfigurableBeanFactory`
  See Also:
    `ConfigurableBeanFactory.addPropertyEditorRegistrar(org.springframework.beans.PropertyEditorRegistrar)`, `ConfigurableBeanFactory.registerCustomEditor(java.lang.Class, java.lang.Class)`

### getCustomTypeConverter

    protected TypeConverter getCustomTypeConverter()

  Return the custom TypeConverter to use, if any.

  Returns:
    the custom TypeConverter, or `null` if none specified

### getTypeConverter

    public TypeConverter getTypeConverter()

  Description copied from interface: `ConfigurableBeanFactory`
  Obtain a type converter as used by this BeanFactory. This may be a fresh instance for each call, since TypeConverters are usually not thread-safe.

  If the default PropertyEditor mechanism is active, the returned TypeConverter will be aware of all custom editors that have been registered.

  Specified by:
    `getTypeConverter` in interface `ConfigurableBeanFactory`

### addBeanPostProcessor

    public void addBeanPostProcessor(BeanPostProcessor beanPostProcessor)

  Description copied from interface: `ConfigurableBeanFactory`
  Add a new BeanPostProcessor that will get applied to beans created by this factory. To be invoked during factory configuration.

  Specified by:
    `addBeanPostProcessor` in interface `ConfigurableBeanFactory`
  Parameters:
    `beanPostProcessor` - the bean processor to register

### getBeanPostProcessorCount

    public int getBeanPostProcessorCount()

  Description copied from interface: `ConfigurableBeanFactory`
  Return the current number of registered BeanPostProcessors, if any.

  Specified by:
    `getBeanPostProcessorCount` in interface `ConfigurableBeanFactory`

### getBeanPostProcessors

    public List getBeanPostProcessors()

  Return the list of BeanPostProcessors that will get applied to beans created with this factory.

### hasInstantiationAwareBeanPostProcessors

    protected boolean hasInstantiationAwareBeanPostProcessors()

  Return whether this factory holds a InstantiationAwareBeanPostProcessor that will get applied to singleton beans on shutdown.

  See Also:
    `addBeanPostProcessor(org.springframework.beans.factory.config.BeanPostProcessor)`, `InstantiationAwareBeanPostProcessor`

### hasDestructionAwareBeanPostProcessors

    protected boolean hasDestructionAwareBeanPostProcessors()

  Return whether this factory holds a DestructionAwareBeanPostProcessor that will get applied to singleton beans on shutdown.

  See Also:
    `addBeanPostProcessor(org.springframework.beans.factory.config.BeanPostProcessor)`, `DestructionAwareBeanPostProcessor`

### registerScope

    public void registerScope(String scopeName,
                              Scope scope)

  Description copied from interface: `ConfigurableBeanFactory`
  Register the given scope, backed by the given Scope implementation.

  Specified by:
    `registerScope` in interface `ConfigurableBeanFactory`
  Parameters:
    `scopeName` - the scope identifier
    `scope` - the backing Scope implementation

### getRegisteredScopeNames

    public String[] getRegisteredScopeNames()

  Description copied from interface: `ConfigurableBeanFactory`
  Return the names of all currently registered scopes.

  This will only return the names of explicitly registered scopes. Built-in scopes such as "singleton" and "prototype" won't be exposed.

  Specified by:
    `getRegisteredScopeNames` in interface `ConfigurableBeanFactory`
  Returns:
    the array of scope names, or an empty array if none
  See Also:
    `ConfigurableBeanFactory.registerScope(java.lang.String, org.springframework.beans.factory.config.Scope)`

### getRegisteredScope

    public Scope getRegisteredScope(String scopeName)

  Description copied from interface: `ConfigurableBeanFactory`
  Return the Scope implementation for the given scope name, if any.

  This will only return explicitly registered scopes. Built-in scopes such as "singleton" and "prototype" won't be exposed.

  Specified by:
    `getRegisteredScope` in interface `ConfigurableBeanFactory`
  Parameters:
    `scopeName` - the name of the scope
  Returns:
    the registered Scope implementation, or `null` if none
  See Also:
    `ConfigurableBeanFactory.registerScope(java.lang.String, org.springframework.beans.factory.config.Scope)`

### copyConfigurationFrom

    public void copyConfigurationFrom(ConfigurableBeanFactory otherFactory)

  Description copied from interface: `ConfigurableBeanFactory`
  Copy all relevant configuration from the given other factory.

  Should include all standard configuration settings as well as BeanPostProcessors, Scopes, and factory-specific internal settings. Should not include any metadata of actual bean definitions, such as BeanDefinition objects and bean name aliases.

  Specified by:
    `copyConfigurationFrom` in interface `ConfigurableBeanFactory`
  Parameters:
    `otherFactory` - the other BeanFactory to copy from

### getMergedBeanDefinition

    public BeanDefinition getMergedBeanDefinition(String name)
                                           throws BeansException

  Return a 'merged' BeanDefinition for the given bean name, merging a child bean definition with its parent if necessary.

  This `getMergedBeanDefinition` considers bean definition in ancestors as well.

  Specified by:
    `getMergedBeanDefinition` in interface `ConfigurableBeanFactory`
  Parameters:
    `name` - the name of the bean to retrieve the merged definition for (may be an alias)
  Returns:
    a (potentially merged) RootBeanDefinition for the given bean
  Throws:
    `NoSuchBeanDefinitionException` - if there is no bean with the given name
    `BeanDefinitionStoreException` - in case of an invalid bean definition
    `BeansException`

### isFactoryBean

    public boolean isFactoryBean(String name)
                          throws NoSuchBeanDefinitionException

  Description copied from interface: `ConfigurableBeanFactory`
  Determine whether the bean with the given name is a FactoryBean.

  Specified by:
    `isFactoryBean` in interface `ConfigurableBeanFactory`
  Parameters:
    `name` - the name of the bean to check
  Returns:
    whether the bean is a FactoryBean (`false` means the bean exists but is not a FactoryBean)
  Throws:
    `NoSuchBeanDefinitionException` - if there is no bean with the given name

### beforePrototypeCreation

    protected void beforePrototypeCreation(String beanName)

  Callback before prototype creation.

  The default implementation register the prototype as currently in creation.

  Parameters:
    `beanName` - the name of the prototype about to be created
  See Also:
    `isPrototypeCurrentlyInCreation(java.lang.String)`

### afterPrototypeCreation

    protected void afterPrototypeCreation(String beanName)

  Callback after prototype creation.

  The default implementation marks the prototype as not in creation anymore.

  Parameters:
    `beanName` - the name of the prototype that has been created
  See Also:
    `isPrototypeCurrentlyInCreation(java.lang.String)`

### isPrototypeCurrentlyInCreation

    protected final boolean isPrototypeCurrentlyInCreation(String beanName)

  Return whether the specified prototype bean is currently in creation (within the current thread).

  Parameters:
    `beanName` - the name of the bean

### isCurrentlyInCreation

    public boolean isCurrentlyInCreation(String beanName)

  Description copied from interface: `ConfigurableBeanFactory`
  Determine whether the specified bean is currently in creation.

  Specified by:
    `isCurrentlyInCreation` in interface `ConfigurableBeanFactory`
  Parameters:
    `beanName` - the name of the bean
  Returns:
    whether the bean is currently in creation

### destroyBean

    public void destroyBean(String beanName,
                            Object beanInstance)

  Description copied from interface: `ConfigurableBeanFactory`
  Destroy the given bean instance (usually a prototype instance obtained from this factory) according to its bean definition.

  Any exception that arises during destruction should be caught and logged instead of propagated to the caller of this method.

  Specified by:
    `destroyBean` in interface `ConfigurableBeanFactory`
  Parameters:
    `beanName` - the name of the bean definition
    `beanInstance` - the bean instance to destroy

### destroyBean

    protected void destroyBean(String beanName,
                               Object beanInstance,
                               RootBeanDefinition mbd)

  Destroy the given bean instance (usually a prototype instance obtained from this factory) according to the given bean definition.

  Parameters:
    `beanName` - the name of the bean definition
    `beanInstance` - the bean instance to destroy
    `mbd` - the merged bean definition

### destroyScopedBean

    public void destroyScopedBean(String beanName)

  Description copied from interface: `ConfigurableBeanFactory`
  Destroy the specified scoped bean in the current target scope, if any.

  Any exception that arises during destruction should be caught and logged instead of propagated to the caller of this method.

  Specified by:
    `destroyScopedBean` in interface `ConfigurableBeanFactory`
  Parameters:
    `beanName` - the name of the scoped bean

### transformedBeanName

    protected String transformedBeanName(String name)

  Return the bean name, stripping out the factory dereference prefix if necessary, and resolving aliases to canonical names.

  Parameters:
    `name` - the user-specified name
  Returns:
    the transformed bean name

### originalBeanName

    protected String originalBeanName(String name)

  Determine the original bean name, resolving locally defined aliases to canonical names.

  Parameters:
    `name` - the user-specified name
  Returns:
    the original bean name

### initBeanWrapper

    protected void initBeanWrapper(BeanWrapper bw)

  Initialize the given BeanWrapper with the custom editors registered with this factory. To be called for BeanWrappers that will create and populate bean instances.

  The default implementation delegates to `registerCustomEditors`. Can be overridden in subclasses.

  Parameters:
    `bw` - the BeanWrapper to initialize
  See Also:
    `registerCustomEditors(org.springframework.beans.PropertyEditorRegistry)`

### registerCustomEditors

    protected void registerCustomEditors(PropertyEditorRegistry registry)

  Initialize the given PropertyEditorRegistry with the custom editors registered with this BeanFactory.

  To be called for BeanWrappers that will create and populate bean instances, and for SimpleTypeConverter used for constructor argument and factory method type conversion.

  Parameters:
    `registry` - the PropertyEditorRegistry to initialize

### getMergedLocalBeanDefinition

    protected RootBeanDefinition getMergedLocalBeanDefinition(String beanName)
                                                       throws BeansException

  Return a merged RootBeanDefinition, traversing the parent bean definition if the specified bean corresponds to a child bean definition.

  Parameters:
    `beanName` - the name of the bean to retrieve the merged definition for
  Returns:
    a (potentially merged) RootBeanDefinition for the given bean
  Throws:
    `NoSuchBeanDefinitionException` - if there is no bean with the given name
    `BeanDefinitionStoreException` - in case of an invalid bean definition
    `BeansException`

### getMergedBeanDefinition

    protected RootBeanDefinition getMergedBeanDefinition(String beanName,
                                                         BeanDefinition bd)
                                                  throws BeanDefinitionStoreException

  Return a RootBeanDefinition for the given top-level bean, by merging with the parent if the given bean's definition is a child bean definition.

  Parameters:
    `beanName` - the name of the bean definition
    `bd` - the original bean definition (Root/ChildBeanDefinition)
  Returns:
    a (potentially merged) RootBeanDefinition for the given bean
  Throws:
    `BeanDefinitionStoreException` - in case of an invalid bean definition

### getMergedBeanDefinition

    protected RootBeanDefinition getMergedBeanDefinition(String beanName,
                                                         BeanDefinition bd,
                                                         BeanDefinition containingBd)
                                                  throws BeanDefinitionStoreException

  Return a RootBeanDefinition for the given bean, by merging with the parent if the given bean's definition is a child bean definition.

  Parameters:
    `beanName` - the name of the bean definition
    `bd` - the original bean definition (Root/ChildBeanDefinition)
    `containingBd` - the containing bean definition in case of inner bean, or `null` in case of a top-level bean
  Returns:
    a (potentially merged) RootBeanDefinition for the given bean
  Throws:
    `BeanDefinitionStoreException` - in case of an invalid bean definition

### checkMergedBeanDefinition

    protected void checkMergedBeanDefinition(RootBeanDefinition mbd,
                                             String beanName,
                                             Object[] args)
                                      throws BeanDefinitionStoreException

  Check the given merged bean definition, potentially throwing validation exceptions.

  Parameters:
    `mbd` - the merged bean definition to check
    `beanName` - the name of the bean
    `args` - the arguments for bean creation, if any
  Throws:
    `BeanDefinitionStoreException` - in case of validation failure

### clearMergedBeanDefinition

    protected void clearMergedBeanDefinition(String beanName)

  Remove the merged bean definition for the specified bean, recreating it on next access.

  Parameters:
    `beanName` - the bean name to clear the merged definition for

### resolveBeanClass

    protected Class resolveBeanClass(RootBeanDefinition mbd,
                                     String beanName)

  Resolve the bean class for the specified bean definition, resolving a bean class name into a Class reference (if necessary) and storing the resolved Class in the bean definition for further use.

  Parameters:
    `mbd` - the merged bean definition to determine the class for
    `beanName` - the name of the bean (for error handling purposes)
  Returns:
    the resolved bean class (or `null` if none)
  Throws:
    `CannotLoadBeanClassException` - if we failed to load the class

### resolveBeanClass

    protected Class resolveBeanClass(RootBeanDefinition mbd,
                                     String beanName,
                                     Class[] typesToMatch)
                              throws CannotLoadBeanClassException

  Resolve the bean class for the specified bean definition, resolving a bean class name into a Class reference (if necessary) and storing the resolved Class in the bean definition for further use.

  Parameters:
    `mbd` - the merged bean definition to determine the class for
    `beanName` - the name of the bean (for error handling purposes)
    `typesToMatch` - the types to match in case of internal type matching purposes (also signals that the returned `Class` will never be exposed to application code)
  Returns:
    the resolved bean class (or `null` if none)
  Throws:
    `CannotLoadBeanClassException` - if we failed to load the class

### predictBeanType

    protected Class predictBeanType(String beanName,
                                    RootBeanDefinition mbd,
                                    Class[] typesToMatch)

  Predict the eventual bean type (of the processed bean instance) for the specified bean. Called by `getType(java.lang.String)` and `isTypeMatch(java.lang.String, java.lang.Class)`. Does not need to handle FactoryBeans specifically, since it is only supposed to operate on the raw bean type.

  This implementation is simplistic in that it is not able to handle factory methods and InstantiationAwareBeanPostProcessors. It only predicts the bean type correctly for a standard bean. To be overridden in subclasses, applying more sophisticated type detection.

  Parameters:
    `beanName` - the name of the bean
    `mbd` - the merged bean definition to determine the type for
    `typesToMatch` - the types to match in case of internal type matching purposes (also signals that the returned `Class` will never be exposed to application code)
  Returns:
    the type of the bean, or `null` if not predictable

### isFactoryBean

    protected boolean isFactoryBean(String beanName,
                                    RootBeanDefinition mbd)

  Check whether the given bean is defined as a `FactoryBean`.

  Parameters:
    `beanName` - the name of the bean
    `mbd` - the corresponding bean definition

### getTypeForFactoryBean

    protected Class getTypeForFactoryBean(String beanName,
                                          RootBeanDefinition mbd)

  Determine the bean type for the given FactoryBean definition, as far as possible. Only called if there is no singleton instance registered for the target bean already.

  The default implementation creates the FactoryBean via `getBean` to call its `getObjectType` method. Subclasses are encouraged to optimize this, typically by just instantiating the FactoryBean but not populating it yet, trying whether its `getObjectType` method already returns a type. If no type found, a full FactoryBean creation as performed by this implementation should be used as fallback.

  Parameters:
    `beanName` - the name of the bean
    `mbd` - the merged bean definition for the bean
  Returns:
    the type for the bean if determinable, or `null` else
  See Also:
    `FactoryBean.getObjectType()`, `getBean(String)`

### markBeanAsCreated

    protected void markBeanAsCreated(String beanName)

  Mark the specified bean as already created (or about to be created).

  This allows the bean factory to optimize its caching for repeated creation of the specified bean.

  Parameters:
    `beanName` - the name of the bean

### isBeanEligibleForMetadataCaching

    protected boolean isBeanEligibleForMetadataCaching(String beanName)

  Determine whether the specified bean is eligible for having its bean definition metadata cached.

  Parameters:
    `beanName` - the name of the bean
  Returns:
    `true` if the bean's metadata may be cached at this point already

### removeSingletonIfCreatedForTypeCheckOnly

    protected boolean removeSingletonIfCreatedForTypeCheckOnly(String beanName)

  Remove the singleton instance (if any) for the given bean name, but only if it hasn't been used for other purposes than type checking.

  Parameters:
    `beanName` - the name of the bean
  Returns:
    `true` if actually removed, `false` otherwise

### getObjectForBeanInstance

    protected Object getObjectForBeanInstance(Object beanInstance,
                                              String name,
                                              String beanName,
                                              RootBeanDefinition mbd)

  Get the object for the given bean instance, either the bean instance itself or its created object in case of a FactoryBean.

  Parameters:
    `beanInstance` - the shared bean instance
    `name` - name that may include factory dereference prefix
    `beanName` - the canonical bean name
    `mbd` - the merged bean definition
  Returns:
    the object to expose for the bean

### isBeanNameInUse

    public boolean isBeanNameInUse(String beanName)

  Determine whether the given bean name is already in use within this factory, i.e. whether there is a local bean or alias registered under this name or an inner bean created with this name.

  Parameters:
    `beanName` - the name to check

### requiresDestruction

    protected boolean requiresDestruction(Object bean,
                                          RootBeanDefinition mbd)

  Determine whether the given bean requires destruction on shutdown.

  The default implementation checks the DisposableBean interface as well as a specified destroy method and registered DestructionAwareBeanPostProcessors.

  Parameters:
    `bean` - the bean instance to check
    `mbd` - the corresponding bean definition
  See Also:
    `DisposableBean`, `AbstractBeanDefinition.getDestroyMethodName()`, `DestructionAwareBeanPostProcessor`

### registerDisposableBeanIfNecessary

    protected void registerDisposableBeanIfNecessary(String beanName,
                                                     Object bean,
                                                     RootBeanDefinition mbd)

  Add the given bean to the list of disposable beans in this factory, registering its DisposableBean interface and/or the given destroy method to be called on factory shutdown (if applicable). Only applies to singletons.

  Parameters:
    `beanName` - the name of the bean
    `bean` - the bean instance
    `mbd` - the bean definition for the bean
  See Also:
    `AbstractBeanDefinition.isSingleton()`, `AbstractBeanDefinition.getDependsOn()`, `DefaultSingletonBeanRegistry.registerDisposableBean(java.lang.String, org.springframework.beans.factory.DisposableBean)`, `DefaultSingletonBeanRegistry.registerDependentBean(java.lang.String, java.lang.String)`

### containsBeanDefinition

    protected abstract boolean containsBeanDefinition(String beanName)

  Check if this bean factory contains a bean definition with the given name. Does not consider any hierarchy this factory may participate in. Invoked by `containsBean` when no cached singleton instance is found.

  Depending on the nature of the concrete bean factory implementation, this operation might be expensive (for example, because of directory lookups in external registries). However, for listable bean factories, this usually just amounts to a local hash lookup: The operation is therefore part of the public interface there. The same implementation can serve for both this template method and the public interface method in that case.

  Parameters:
    `beanName` - the name of the bean to look for
  Returns:
    if this bean factory contains a bean definition with the given name
  See Also:
    `containsBean(java.lang.String)`, `ListableBeanFactory.containsBeanDefinition(java.lang.String)`

### getBeanDefinition

    protected abstract BeanDefinition getBeanDefinition(String beanName)
                                                 throws BeansException

  Return the bean definition for the given bean name. Subclasses should normally implement caching, as this method is invoked by this class every time bean definition metadata is needed.

  Depending on the nature of the concrete bean factory implementation, this operation might be expensive (for example, because of directory lookups in external registries). However, for listable bean factories, this usually just amounts to a local hash lookup: The operation is therefore part of the public interface there. The same implementation can serve for both this template method and the public interface method in that case.

  Parameters:
    `beanName` - the name of the bean to find a definition for
  Returns:
    the BeanDefinition for this prototype name (never `null`)
  Throws:
    `NoSuchBeanDefinitionException` - if the bean definition cannot be resolved
    `BeansException` - in case of errors
  See Also:
    `RootBeanDefinition`, `ChildBeanDefinition`, `ConfigurableListableBeanFactory.getBeanDefinition(java.lang.String)`

### createBean

    protected abstract Object createBean(String beanName,
                                         RootBeanDefinition mbd,
                                         Object[] args)
                                  throws BeanCreationException

  Create a bean instance for the given bean definition. The bean definition will already have been merged with the parent definition in case of a child definition.

  All the other methods in this class invoke this method, although beans may be cached after being instantiated by this method. All bean instantiation within this class is performed by this method.

  Parameters:
    `beanName` - the name of the bean
    `mbd` - the merged bean definition for the bean
    `args` - arguments to use if creating a prototype using explicit arguments to a static factory method. This parameter must be `null` except in this case.
  Returns:
    a new instance of the bean
  Throws:
    `BeanCreationException` - if the bean could not be created

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