@Test
  public void shouldUseExtendedBeanInfoWhenApplicable()
      throws NoSuchMethodException, SecurityException {
    // given a class with a non-void returning setter method
    @SuppressWarnings("unused")
    class C {
      public Object setFoo(String s) {
        return this;
      }

      public String getFoo() {
        return null;
      }
    }

    // CachedIntrospectionResults should delegate to ExtendedBeanInfo
    CachedIntrospectionResults results = CachedIntrospectionResults.forClass(C.class);
    BeanInfo info = results.getBeanInfo();
    PropertyDescriptor pd = null;
    for (PropertyDescriptor candidate : info.getPropertyDescriptors()) {
      if (candidate.getName().equals("foo")) {
        pd = candidate;
      }
    }

    // resulting in a property descriptor including the non-standard setFoo method
    assertThat(pd, notNullValue());
    assertThat(pd.getReadMethod(), equalTo(C.class.getMethod("getFoo")));
    assertThat(
        "No write method found for non-void returning 'setFoo' method. "
            + "Check to see if CachedIntrospectionResults is delegating to "
            + "ExtendedBeanInfo as expected",
        pd.getWriteMethod(),
        equalTo(C.class.getMethod("setFoo", String.class)));
  }
 @Test
 public void clearClassLoaderForSystemClassLoader() throws Exception {
   BeanUtils.getPropertyDescriptors(ArrayList.class);
   assertTrue(CachedIntrospectionResults.strongClassCache.containsKey(ArrayList.class));
   CachedIntrospectionResults.clearClassLoader(ArrayList.class.getClassLoader());
   assertFalse(CachedIntrospectionResults.strongClassCache.containsKey(ArrayList.class));
 }
  @Test
  public void acceptAndClearClassLoader() throws Exception {
    BeanWrapper bw = new BeanWrapperImpl(TestBean.class);
    assertTrue(bw.isWritableProperty("name"));
    assertTrue(bw.isWritableProperty("age"));
    assertTrue(CachedIntrospectionResults.strongClassCache.containsKey(TestBean.class));

    ClassLoader child = new OverridingClassLoader(getClass().getClassLoader());
    Class<?> tbClass = child.loadClass("org.springframework.tests.sample.beans.TestBean");
    assertFalse(CachedIntrospectionResults.strongClassCache.containsKey(tbClass));
    CachedIntrospectionResults.acceptClassLoader(child);
    bw = new BeanWrapperImpl(tbClass);
    assertTrue(bw.isWritableProperty("name"));
    assertTrue(bw.isWritableProperty("age"));
    assertTrue(CachedIntrospectionResults.strongClassCache.containsKey(tbClass));
    CachedIntrospectionResults.clearClassLoader(child);
    assertFalse(CachedIntrospectionResults.strongClassCache.containsKey(tbClass));

    assertTrue(CachedIntrospectionResults.strongClassCache.containsKey(TestBean.class));
  }