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## org.springframework.beans
Class BeanUtils

    java.lang.Object
      org.springframework.beans.BeanUtils

    public abstract class BeanUtils

extends Object

Static convenience methods for JavaBeans: for instantiating beans, checking bean property types, copying bean properties, etc.

Mainly for use within the framework, but to some degree also useful for application classes.

Author:
  Rod Johnson, Juergen Hoeller, Rob Harrop

Constructor Summary
`BeanUtils()`

Method Summary
`static void` | `copyProperties(Object source, Object target)` Copy the property values of the given source bean into the target bean.
`static void` | `copyProperties(Object source, Object target, Class editable)` Copy the property values of the given source bean into the given target bean, only setting properties defined in the given "editable" class (or interface).
`static void` | `copyProperties(Object source, Object target, String[] ignoreProperties)` Copy the property values of the given source bean into the given target bean, ignoring the given "ignoreProperties".
`static Method` | `findDeclaredMethod(Class clazz, String methodName, Class[] paramTypes)` Find a method with the given method name and the given parameter types, declared on the given class or one of its superclasses.
`static Method` | `findDeclaredMethodWithMinimalParameters(Class clazz, String methodName)` Find a method with the given method name and minimal parameters (best case: none), declared on the given class or one of its superclasses.
`static Method` | `findMethod(Class clazz, String methodName, Class[] paramTypes)` Find a method with the given method name and the given parameter types, declared on the given class or one of its superclasses.
`static Method` | `findMethodWithMinimalParameters(Class clazz, String methodName)` Find a method with the given method name and minimal parameters (best case: none), declared on the given class or one of its superclasses.
`static PropertyDescriptor` | `findPropertyForMethod(Method method)` Find a JavaBeans `PropertyDescriptor` for the given method, with the method either being the read method or the write method for that bean property.
`static Class` | `findPropertyType(String propertyName, Class[] beanClasses)` Determine the bean property type for the given property from the given classes/interfaces, if possible.
`static PropertyDescriptor` | `getPropertyDescriptor(Class clazz, String propertyName)` Retrieve the JavaBeans `PropertyDescriptors` for the given property.
`static PropertyDescriptor[]` | `getPropertyDescriptors(Class clazz)` Retrieve the JavaBeans `PropertyDescriptor`s of a given class.
`static Object` | `instantiateClass(Class clazz)` Convenience method to instantiate a class using its no-arg constructor.
`static Object` | `instantiateClass(Constructor ctor, Object[] args)` Convenience method to instantiate a class using the given constructor.
`static boolean` | `isAssignable(Class targetType, Class valueType)` Deprecated. as of Spring 2.0, in favor of `ClassUtils.isAssignable`
`static boolean` | `isAssignable(Class type, Object value)` Deprecated. as of Spring 2.0, in favor of `ClassUtils.isAssignableValue`
`static boolean` | `isSimpleProperty(Class clazz)` Check if the given type represents a "simple" property: a primitive, a String, a Class, or a corresponding array.
`static Method` | `resolveSignature(String signature, Class clazz)` Parse a method signature in the form `methodName[([arg_list])]`, where `arg_list` is an optional, comma-separated list of fully-qualified type names, and attempts to resolve that signature against the supplied `Class`.

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

Constructor Detail

### BeanUtils

    public BeanUtils()

Method Detail

### instantiateClass

    public static Object instantiateClass(Class clazz)
                                   throws BeanInstantiationException

  Convenience method to instantiate a class using its no-arg constructor. As this method doesn't try to load classes by name, it should avoid class-loading issues.

  Note that this method tries to set the constructor accessible if given a non-accessible (that is, non-public) constructor.

  Parameters:
    `clazz` - class to instantiate
  Returns:
    the new instance
  Throws:
    `BeanInstantiationException` - if the bean cannot be instantiated

### instantiateClass

    public static Object instantiateClass(Constructor ctor,
                                          Object[] args)
                                   throws BeanInstantiationException

  Convenience method to instantiate a class using the given constructor. As this method doesn't try to load classes by name, it should avoid class-loading issues.

  Note that this method tries to set the constructor accessible if given a non-accessible (that is, non-public) constructor.

  Parameters:
    `ctor` - the constructor to instantiate
    `args` - the constructor arguments to apply
  Returns:
    the new instance
  Throws:
    `BeanInstantiationException` - if the bean cannot be instantiated

### findMethod

    public static Method findMethod(Class clazz,
                                    String methodName,
                                    Class[] paramTypes)

  Find a method with the given method name and the given parameter types, declared on the given class or one of its superclasses. Prefers public methods, but will return a protected, package access, or private method too.

  Checks `Class.getMethod` first, falling back to `findDeclaredMethod`. This allows to find public methods without issues even in environments with restricted Java security settings.

  Parameters:
    `clazz` - the class to check
    `methodName` - the name of the method to find
    `paramTypes` - the parameter types of the method to find
  Returns:
    the Method object, or `null` if not found
  See Also:
    `Class.getMethod(java.lang.String, java.lang.Class...)`, `findDeclaredMethod(java.lang.Class, java.lang.String, java.lang.Class[])`

### findDeclaredMethod

    public static Method findDeclaredMethod(Class clazz,
                                            String methodName,
                                            Class[] paramTypes)

  Find a method with the given method name and the given parameter types, declared on the given class or one of its superclasses. Will return a public, protected, package access, or private method.

  Checks `Class.getDeclaredMethod`, cascading upwards to all superclasses.

  Parameters:
    `clazz` - the class to check
    `methodName` - the name of the method to find
    `paramTypes` - the parameter types of the method to find
  Returns:
    the Method object, or `null` if not found
  See Also:
    `Class.getDeclaredMethod(java.lang.String, java.lang.Class...)`

### findMethodWithMinimalParameters

    public static Method findMethodWithMinimalParameters(Class clazz,
                                                         String methodName)
                                                  throws IllegalArgumentException

  Find a method with the given method name and minimal parameters (best case: none), declared on the given class or one of its superclasses. Prefers public methods, but will return a protected, package access, or private method too.

  Checks `Class.getMethods` first, falling back to `findDeclaredMethodWithMinimalParameters`. This allows to find public methods without issues even in environments with restricted Java security settings.

  Parameters:
    `clazz` - the class to check
    `methodName` - the name of the method to find
  Returns:
    the Method object, or `null` if not found
  Throws:
    `IllegalArgumentException` - if methods of the given name were found but could not be resolved to a unique method with minimal parameters
  See Also:
    `Class.getMethods()`, `findDeclaredMethodWithMinimalParameters(java.lang.Class, java.lang.String)`

### findDeclaredMethodWithMinimalParameters

    public static Method findDeclaredMethodWithMinimalParameters(Class clazz,
                                                                 String methodName)
                                                          throws IllegalArgumentException

  Find a method with the given method name and minimal parameters (best case: none), declared on the given class or one of its superclasses. Will return a public, protected, package access, or private method.

  Checks `Class.getDeclaredMethods`, cascading upwards to all superclasses.

  Parameters:
    `clazz` - the class to check
    `methodName` - the name of the method to find
  Returns:
    the Method object, or `null` if not found
  Throws:
    `IllegalArgumentException` - if methods of the given name were found but could not be resolved to a unique method with minimal parameters
  See Also:
    `Class.getDeclaredMethods()`

### resolveSignature

    public static Method resolveSignature(String signature,
                                          Class clazz)

  Parse a method signature in the form `methodName[([arg_list])]`, where `arg_list` is an optional, comma-separated list of fully-qualified type names, and attempts to resolve that signature against the supplied `Class`.

  When not supplying an argument list (`methodName`) the method whose name matches and has the least number of parameters will be returned. When supplying an argument type list, only the method whose name and argument types match will be returned.

  Note then that `methodName` and `methodName()` are not resolved in the same way. The signature `methodName` means the method called `methodName` with the least number of arguments, whereas `methodName()` means the method called `methodName` with exactly 0 arguments.

  If no method can be found, then `null` is returned.

  Parameters:
    `signature` - the method signature as String representation
    `clazz` - the class to resolve the method signature against
  Returns:
    the resolved Method
  See Also:
    `findMethod(java.lang.Class, java.lang.String, java.lang.Class[])`, `findMethodWithMinimalParameters(java.lang.Class, java.lang.String)`

### getPropertyDescriptors

    public static PropertyDescriptor[] getPropertyDescriptors(Class clazz)
                                                       throws BeansException

  Retrieve the JavaBeans `PropertyDescriptor`s of a given class.

  Parameters:
    `clazz` - the Class to retrieve the PropertyDescriptors for
  Returns:
    an array of `PropertyDescriptors` for the given class
  Throws:
    `BeansException` - if PropertyDescriptor look fails

### getPropertyDescriptor

    public static PropertyDescriptor getPropertyDescriptor(Class clazz,
                                                           String propertyName)
                                                    throws BeansException

  Retrieve the JavaBeans `PropertyDescriptors` for the given property.

  Parameters:
    `clazz` - the Class to retrieve the PropertyDescriptor for
    `propertyName` - the name of the property
  Returns:
    the corresponding PropertyDescriptor, or `null` if none
  Throws:
    `BeansException` - if PropertyDescriptor lookup fails

### findPropertyForMethod

    public static PropertyDescriptor findPropertyForMethod(Method method)
                                                    throws BeansException

  Find a JavaBeans `PropertyDescriptor` for the given method, with the method either being the read method or the write method for that bean property.

  Parameters:
    `method` - the method to find a corresponding PropertyDescriptor for
  Returns:
    the corresponding PropertyDescriptor, or `null` if none
  Throws:
    `BeansException` - if PropertyDescriptor lookup fails

### findPropertyType

    public static Class findPropertyType(String propertyName,
                                         Class[] beanClasses)

  Determine the bean property type for the given property from the given classes/interfaces, if possible.

  Parameters:
    `propertyName` - the name of the bean property
    `beanClasses` - the classes to check against
  Returns:
    the property type, or `Object.class` as fallback

### isSimpleProperty

    public static boolean isSimpleProperty(Class clazz)

  Check if the given type represents a "simple" property: a primitive, a String, a Class, or a corresponding array.

  Used to determine properties to check for a "simple" dependency-check.

  Parameters:
    `clazz` - the type to check
  Returns:
    whether the given type represent a "simple" property
  See Also:
    `AbstractBeanDefinition.DEPENDENCY_CHECK_SIMPLE`, `AbstractAutowireCapableBeanFactory.checkDependencies(java.lang.String, org.springframework.beans.factory.support.RootBeanDefinition, java.beans.PropertyDescriptor[], org.springframework.beans.PropertyValues)`

### isAssignable

    public static boolean isAssignable(Class targetType,
                                       Class valueType)

  Deprecated. as of Spring 2.0, in favor of `ClassUtils.isAssignable`

  Determine if the given target type is assignable from the given value type, assuming setting by reflection. Considers primitive wrapper classes as assignable to the corresponding primitive types.

  Parameters:
    `targetType` - the target type
    `valueType` - the value type that should be assigned to the target type
  Returns:
    if the target type is assignable from the value type
  See Also:
    `ClassUtils.isAssignable(Class, Class)`

### isAssignable

    public static boolean isAssignable(Class type,
                                       Object value)

  Deprecated. as of Spring 2.0, in favor of `ClassUtils.isAssignableValue`

  Determine if the given type is assignable from the given value, assuming setting by reflection. Considers primitive wrapper classes as assignable to the corresponding primitive types.

  Parameters:
    `type` - the target type
    `value` - the value that should be assigned to the type
  Returns:
    if the type is assignable from the value
  See Also:
    `ClassUtils.isAssignableValue(Class, Object)`

### copyProperties

    public static void copyProperties(Object source,
                                      Object target)
                               throws BeansException

  Copy the property values of the given source bean into the target bean.

  Note: The source and target classes do not have to match or even be derived from each other, as long as the properties match. Any bean properties that the source bean exposes but the target bean does not will silently be ignored.

  This is just a convenience method. For more complex transfer needs, consider using a full BeanWrapper.

  Parameters:
    `source` - the source bean
    `target` - the target bean
  Throws:
    `BeansException` - if the copying failed
  See Also:
    `BeanWrapper`

### copyProperties

    public static void copyProperties(Object source,
                                      Object target,
                                      Class editable)
                               throws BeansException

  Copy the property values of the given source bean into the given target bean, only setting properties defined in the given "editable" class (or interface).

  Note: The source and target classes do not have to match or even be derived from each other, as long as the properties match. Any bean properties that the source bean exposes but the target bean does not will silently be ignored.

  This is just a convenience method. For more complex transfer needs, consider using a full BeanWrapper.

  Parameters:
    `source` - the source bean
    `target` - the target bean
    `editable` - the class (or interface) to restrict property setting to
  Throws:
    `BeansException` - if the copying failed
  See Also:
    `BeanWrapper`

### copyProperties

    public static void copyProperties(Object source,
                                      Object target,
                                      String[] ignoreProperties)
                               throws BeansException

  Copy the property values of the given source bean into the given target bean, ignoring the given "ignoreProperties".

  Note: The source and target classes do not have to match or even be derived from each other, as long as the properties match. Any bean properties that the source bean exposes but the target bean does not will silently be ignored.

  This is just a convenience method. For more complex transfer needs, consider using a full BeanWrapper.

  Parameters:
    `source` - the source bean
    `target` - the target bean
    `ignoreProperties` - array of property names to ignore
  Throws:
    `BeansException` - if the copying failed
  See Also:
    `BeanWrapper`

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