How to use

getField

method

in

org.powermock.reflect.Whitebox

/**
 * Get a field from a class.
 * <p>
 * The method will first try to look for a declared field in the same class.
 * If the method is not declared in this class it will look for the field in
 * the super class. This will continue throughout the whole class hierarchy.
 * If the field is not found an {@link IllegalArgumentException} is thrown.
 * 
 * @param declaringClass
 *            The declaringClass of the class where the method is located.
 * @param fieldName
 *            The method names.
 * @return A <code>java.lang.reflect.Field</code>.
 * @throws FieldNotFoundException
 *             If a field cannot be found in the hierarchy.
 */
public static Field field(Class<?> declaringClass, String fieldName) {
  return Whitebox.getField(declaringClass, fieldName);
}

/**
 * Get a field from a class.
 * <p>
 * The method will first try to look for a declared field in the same class.
 * If the method is not declared in this class it will look for the field in
 * the super class. This will continue throughout the whole class hierarchy.
 * If the field is not found an {@link IllegalArgumentException} is thrown.
 * 
 * @param declaringClass
 *            The declaringClass of the class where the method is located.
 * @param fieldName
 *            The method names.
 * @return A {@code java.lang.reflect.Field}.
 * @throws FieldNotFoundException
 *             If a field cannot be found in the hierarchy.
 */
public static Field field(Class<?> declaringClass, String fieldName) {
  return Whitebox.getField(declaringClass, fieldName);
}

final Field declaredField = Whitebox.getField(getType(source), field.getName());
declaredField.setAccessible(true);
final Object object = declaredField.get(source);

final Field declaredField = Whitebox.getField(getType(source), field.getName());
declaredField.setAccessible(true);
final Object object = declaredField.get(source);

@Test
void testClassLoader() throws Exception {
  MockTransformerService mockTransformerService = new MockTransformerService() {
    @Nonnull
    @Override
    public List<ITransformer> transformers() {
      return Stream.of(classNodeTransformer).collect(Collectors.toList());
    }
  };
  TransformStore transformStore = new TransformStore();
  LaunchPluginHandler lph = new LaunchPluginHandler();
  TransformationServiceDecorator sd = Whitebox.invokeConstructor(TransformationServiceDecorator.class, mockTransformerService);
  sd.gatherTransformers(transformStore);
  final Constructor<TransformingClassLoader> constructor = Whitebox.getConstructor(TransformingClassLoader.class, transformStore.getClass(), lph.getClass(), Path[].class);
  TransformingClassLoader tcl = constructor.newInstance(transformStore, lph, new Path[] {FileSystems.getDefault().getPath(".")});
  final Class<?> aClass = Class.forName("cheese.Puffs", true, tcl);
  assertEquals(Whitebox.getField(aClass, "testfield").getType(), String.class);
  assertEquals(Whitebox.getField(aClass, "testfield").get(null), "CHEESE!");
}