Examples of org.powermock.classloading.ClassloaderExecutor

org.powermock.classloading.ClassloaderExecutor
A ClassLoaderExecutor can run any code in any classloader. E.g. assume you have a classloader called myClassloader and you want to execute a (void) method called myMethod in myObject using this CL:
```
 ClassloaderExecutor cle = new ClassloaderExecutor(myClassloader); cle.execute(new Runnable() { public void run() { myObject.myMethod(); } }); 
```
What happens is that the entire object graph of myObject is deep-cloned into the myClassloader classloader and then the myObject.myMethod() is executed.
You can also execute methods that return something:
```
 ClassloaderExecutor cle = new ClassloaderExecutor(myClassloader); MyResult result = cle.execute(new Callable() { public MyResult call() throws Exception { return myObject.myMethod(); } }); 
```
Here we imagine that myObject.myMethod() returns an object of type MyResult. Again the entire state will be deep-cloned to myClassloader and then the myObject.myMethod() is executed. The result of the method call is deep-cloned back into the original classloader (the one that made the call to cle.execute(..)) and is ready for use.

Note that the ClassloaderExecutor requires a deep cloner implementing the {@link DeepClonerSPI} present in the class-path.

  public void loadsObjectGraphInSpecifiedClassloaderAndReturnsResultInOriginalClassloader() throws Exception {
    MockClassLoader classloader = createClassloader();
    final MyReturnValue expectedConstructorValue = new MyReturnValue(new MyArgument("first value"));
    final MyClass myClass = new MyClass(expectedConstructorValue);
    final MyArgument expected = new MyArgument("A value");
    MyReturnValue[] actual = new ClassloaderExecutor(classloader).execute(new Callable<MyReturnValue[]>() {
      public MyReturnValue[] call() throws Exception {
        assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass().getName());
        return myClass.myMethod(expected);
      }
    });

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  public void loadsObjectGraphThatIncludesPrimitiveValuesInSpecifiedClassloaderAndReturnsResultInOriginalClassloader()
      throws Exception {
    MockClassLoader classloader = createClassloader();
    final Integer expected = 42;
    final MyIntegerHolder myClass = new MyIntegerHolder(expected);
    Integer actual = new ClassloaderExecutor(classloader).execute(new Callable<Integer>() {
      public Integer call() throws Exception {
        assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass().getName());
        final int myInteger = myClass.getMyInteger();
        assertEquals((int) expected, myInteger);
        return myInteger;

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  public void loadsObjectGraphThatIncludesEnumsInSpecifiedClassloaderAndReturnsResultInOriginalClassloader()
      throws Exception {
    MockClassLoader classloader = createClassloader();
    final MyEnum expected = MyEnum.MyEnum1;
    final MyEnumHolder myClass = new MyEnumHolder(expected);
    MyEnum actual = new ClassloaderExecutor(classloader).execute(new Callable<MyEnum>() {
      public MyEnum call() throws Exception {
        assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass().getName());
        MyEnum myEnum = myClass.getMyEnum();
        assertEquals(expected, myEnum);
        return myEnum;

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  @Test
  public void clonesStaticFinalObjectFields() throws Exception {
    MockClassLoader classloader = createClassloader();
    final MyStaticFinalArgumentHolder expected = new MyStaticFinalArgumentHolder();
    MyStaticFinalArgumentHolder actual = new ClassloaderExecutor(classloader)
        .execute(new Callable<MyStaticFinalArgumentHolder>() {
          public MyStaticFinalArgumentHolder call() throws Exception {
            assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass()
                .getName());
            MyStaticFinalArgumentHolder actual = new MyStaticFinalArgumentHolder();

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  @Test
  public void clonesStaticFinalPrimitiveFields() throws Exception {
    MockClassLoader classloader = createClassloader();
    final MyStaticFinalPrimitiveHolder expected = new MyStaticFinalPrimitiveHolder();
    MyStaticFinalPrimitiveHolder actual = new ClassloaderExecutor(classloader)
        .execute(new Callable<MyStaticFinalPrimitiveHolder>() {
          public MyStaticFinalPrimitiveHolder call() throws Exception {
            assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass()
                .getName());
            MyStaticFinalPrimitiveHolder actual = new MyStaticFinalPrimitiveHolder();

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  @Test
  public void clonesStaticFinalNumberFields() throws Exception {
    MockClassLoader classloader = createClassloader();
    final MyStaticFinalNumberHolder expected = new MyStaticFinalNumberHolder();
    MyStaticFinalNumberHolder actual = new ClassloaderExecutor(classloader)
        .execute(new Callable<MyStaticFinalNumberHolder>() {
          public MyStaticFinalNumberHolder call() throws Exception {
            assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass()
                .getName());
            MyStaticFinalNumberHolder actual = new MyStaticFinalNumberHolder();

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  public void loadsObjectGraphThatIncludesPrimitiveArraysInSpecifiedClassloaderAndReturnsResultInOriginalClassloader()
      throws Exception {
    MockClassLoader classloader = createClassloader();
    final int[] expected = new int[] { 1, 2 };
    final MyPrimitiveArrayHolder myClass = new MyPrimitiveArrayHolder(expected);
    int[] actual = new ClassloaderExecutor(classloader).execute(new Callable<int[]>() {
      public int[] call() throws Exception {
        assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass().getName());
        int[] myArray = myClass.getMyArray();
        assertArrayEquals(expected, myArray);
        return myArray;

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    final MockClassLoader classloader = createClassloader();
    final Collection<MyReturnValue> expected = new LinkedList<MyReturnValue>();
    expected.add(new MyReturnValue(new MyArgument("one")));
    expected.add(new MyReturnValue(new MyArgument("two")));
    final MyCollectionHolder myClass = new MyCollectionHolder(expected);
    Collection<?> actual = new ClassloaderExecutor(classloader).execute(new Callable<Collection<?>>() {
      public Collection<?> call() throws Exception {
        assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass().getName());
        Collection<?> myCollection = myClass.getMyCollection();
        for (Object object : myCollection) {
          assertEquals(MockClassLoader.class.getName(), object.getClass().getClassLoader().getClass()

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  public void usesReferenceCloningWhenTwoFieldsPointToSameInstance() throws Exception {
    final MockClassLoader classloader = createClassloader();
    final MyReferenceFieldHolder tested = new MyReferenceFieldHolder();
    assertSame(tested.getMyArgument1(), tested.getMyArgument2());
    assertSame(tested.getMyArgument1(), MyReferenceFieldHolder.MY_ARGUMENT);
    new ClassloaderExecutor(classloader).execute(new Runnable() {
      public void run() {
        assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass().getName());
        assertEquals(tested.getMyArgument1(), tested.getMyArgument2());
        assertEquals(tested.getMyArgument1(), MyReferenceFieldHolder.MY_ARGUMENT);
        assertSame(tested.getMyArgument1(), tested.getMyArgument2());

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  public void worksWithObjectHierarchy() throws Exception {
    final MockClassLoader classloader = createClassloader();
    final MyHierarchicalFieldHolder tested = new MyHierarchicalFieldHolder();
    assertSame(tested.getMyArgument1(), tested.getMyArgument2());
    assertEquals(tested.getMyArgument3(), tested.getMyArgument2());
    new ClassloaderExecutor(classloader).execute(new Runnable() {
      public void run() {
        assertEquals(MockClassLoader.class.getName(), this.getClass().getClassLoader().getClass().getName());
        assertSame(tested.getMyArgument1(), tested.getMyArgument2());
        assertEquals(tested.getMyArgument3(), tested.getMyArgument2());
      }

View Full Code Here

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