org.springframework.test.util

Class ReflectionTestUtils

java.lang.Object

org.springframework.test.util.ReflectionTestUtils

public class ReflectionTestUtils
extends Object

ReflectionTestUtils is a collection of reflection-based utility methods for use in unit and integration testing scenarios.

There are often times when it would be beneficial to be able to set a non-public field, invoke a non-public setter method, or invoke a non-public configuration or lifecycle callback method when testing code involving, for example:

• ORM frameworks such as JPA and Hibernate which condone the usage of private or protected field access as opposed to public setter methods for properties in a domain entity.
• Spring's support for annotations such as @Autowired and @Resource which provides dependency injection for private or protected fields, setter methods, and configuration methods.
• Use of annotations such as @PostConstruct and @PreDestroy for lifecycle callback methods.

Since:

2.5

Author:

Sam Brannen, Juergen Hoeller

See Also:

ReflectionUtils

Constructor Summary

Constructors

Constructor and Description
ReflectionTestUtils()

Method Summary

Modifier and Type	Method and Description
static Object	getField(Object target, String name) Get the field with the given name from the provided target object.
static Object	invokeGetterMethod(Object target, String name) Invoke the getter method with the given name on the supplied target object with the supplied value.
static <T> T	invokeMethod(Object target, String name, Object... args) Invoke the method with the given name on the supplied target object with the supplied arguments.
static void	invokeSetterMethod(Object target, String name, Object value) Invoke the setter method with the given name on the supplied target object with the supplied value.
static void	invokeSetterMethod(Object target, String name, Object value, Class<?> type) Invoke the setter method with the given name on the supplied target object with the supplied value.
static void	setField(Object target, String name, Object value) Set the field with the given name on the provided target object to the supplied value.
static void	setField(Object target, String name, Object value, Class<?> type) Set the field with the given name on the provided target object to the supplied value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReflectionTestUtils

public ReflectionTestUtils()

Method Detail

setField

public static void setField(Object target,
                            String name,
                            Object value)

Set the field with the given name on the provided target object to the supplied value.

This method traverses the class hierarchy in search of the desired field. In addition, an attempt will be made to make non-public fields accessible, thus allowing one to set protected, private, and package-private fields.

Parameters:

target - the target object on which to set the field

name - the name of the field to set

value - the value to set

See Also:

ReflectionUtils.findField(Class, String, Class), ReflectionUtils.makeAccessible(Field), ReflectionUtils.setField(Field, Object, Object)

setField

public static void setField(Object target,
                            String name,
                            Object value,
                            Class<?> type)

Set the field with the given name on the provided target object to the supplied value.

This method traverses the class hierarchy in search of the desired field. In addition, an attempt will be made to make non-public fields accessible, thus allowing one to set protected, private, and package-private fields.

Parameters:

target - the target object on which to set the field

name - the name of the field to set

value - the value to set

type - the type of the field (may be null)

See Also:

ReflectionUtils.findField(Class, String, Class), ReflectionUtils.makeAccessible(Field), ReflectionUtils.setField(Field, Object, Object)

getField

public static Object getField(Object target,
                              String name)

Get the field with the given name from the provided target object.

This method traverses the class hierarchy in search of the desired field. In addition, an attempt will be made to make non-public fields accessible, thus allowing one to get protected, private, and package-private fields.

Parameters:

target - the target object on which to set the field

name - the name of the field to get

Returns:

the field's current value

See Also:

ReflectionUtils.findField(Class, String, Class), ReflectionUtils.makeAccessible(Field), ReflectionUtils.setField(Field, Object, Object)

invokeSetterMethod

public static void invokeSetterMethod(Object target,
                                      String name,
                                      Object value)

Invoke the setter method with the given name on the supplied target object with the supplied value.

This method traverses the class hierarchy in search of the desired method. In addition, an attempt will be made to make non-public methods accessible, thus allowing one to invoke protected, private, and package-private setter methods.

In addition, this method supports JavaBean-style property names. For example, if you wish to set the name property on the target object, you may pass either "name" or "setName" as the method name.

Parameters:

target - the target object on which to invoke the specified setter method

name - the name of the setter method to invoke or the corresponding property name

value - the value to provide to the setter method

See Also:

ReflectionUtils.findMethod(Class, String, Class[]), ReflectionUtils.makeAccessible(Method), ReflectionUtils.invokeMethod(Method, Object, Object[])

invokeSetterMethod

public static void invokeSetterMethod(Object target,
                                      String name,
                                      Object value,
                                      Class<?> type)

Invoke the setter method with the given name on the supplied target object with the supplied value.

This method traverses the class hierarchy in search of the desired method. In addition, an attempt will be made to make non-public methods accessible, thus allowing one to invoke protected, private, and package-private setter methods.

In addition, this method supports JavaBean-style property names. For example, if you wish to set the name property on the target object, you may pass either "name" or "setName" as the method name.

Parameters:

target - the target object on which to invoke the specified setter method

name - the name of the setter method to invoke or the corresponding property name

value - the value to provide to the setter method

type - the formal parameter type declared by the setter method

See Also:

ReflectionUtils.findMethod(Class, String, Class[]), ReflectionUtils.makeAccessible(Method), ReflectionUtils.invokeMethod(Method, Object, Object[])

invokeGetterMethod

public static Object invokeGetterMethod(Object target,
                                        String name)

Invoke the getter method with the given name on the supplied target object with the supplied value.

This method traverses the class hierarchy in search of the desired method. In addition, an attempt will be made to make non-public methods accessible, thus allowing one to invoke protected, private, and package-private getter methods.

In addition, this method supports JavaBean-style property names. For example, if you wish to get the name property on the target object, you may pass either "name" or "getName" as the method name.

Parameters:

target - the target object on which to invoke the specified getter method

name - the name of the getter method to invoke or the corresponding property name

Returns:

the value returned from the invocation

See Also:

ReflectionUtils.findMethod(Class, String, Class[]), ReflectionUtils.makeAccessible(Method), ReflectionUtils.invokeMethod(Method, Object, Object[])

invokeMethod

public static <T> T invokeMethod(Object target,
                                 String name,
                                 Object... args)

Invoke the method with the given name on the supplied target object with the supplied arguments.

This method traverses the class hierarchy in search of the desired method. In addition, an attempt will be made to make non-public methods accessible, thus allowing one to invoke protected, private, and package-private methods.

Parameters:

target - the target object on which to invoke the specified method

name - the name of the method to invoke

args - the arguments to provide to the method

Returns:

the invocation result, if any

See Also:

MethodInvoker, ReflectionUtils.makeAccessible(Method), ReflectionUtils.invokeMethod(Method, Object, Object[]), ReflectionUtils.handleReflectionException(Exception)