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From "Richard O'Sullivan (JIRA)" <>
Subject [jira] Commented: (BEANUTILS-357) PropertyUtilsTestCase.testGetReadMethod* fail for abstract properties.
Date Mon, 24 Aug 2009 14:25:59 GMT


Richard O'Sullivan commented on BEANUTILS-357:

Niall, I found the issue while using BeanUtils 1.8.0 but ran the unit tests using truck (1.9-SNAPSHOT).
Since my initial posting, I narrowed the issue down to the following test case. 

The test below fails due to 'expected:<class org.apache.commons.beanutils.TestBean$InnerClass>
but was:<class org.apache.commons.beanutils.AbstractTestBean$InnerClass>'. My expectation
is that the PropertyDescriptor for the "innerClassProperty" should be the subclass's type
instead of the super's type; but, the test indicates the opposite is occurring.

Background: I encountered this issue while using Wicket Web Beans (WWB) to auto-generate forms.
WWB calls PropertyUtils.getPropertyDescriptors() on a bean to reflectively generate a web
form. In my case, the resulting form did not include my equivalent of 'TestBean.InnerClass'
because, I believe, PropertyUtils returned AbstractTestBean$InnerClass instead of TestBean$InnerClass.

1) Add this to AbstractTestBean:

	public abstract static class InnerClass
		// Subclass implements properties here.
		private String firstName;
		public String getInnerName() { return firstName; }
		public void setInnerName(String firstName) { this.firstName = firstName; };
	public abstract AbstractTestBean.InnerClass getInnerClassProperty();

2) Add implementation to TestBean:

	public static class InnerClass extends AbstractTestBean.InnerClass
		private String lastName;
		public String getLastName() { return lastName;	}
		public void setLastName(String lastName) { this.lastName = lastName; }
	private TestBean.InnerClass innerClassProperty;
	public TestBean.InnerClass getInnerClassProperty()
		return innerClassProperty;
	public void setInnerClassProperty(TestBean.InnerClass innerClassProperty)
		this.innerClassProperty = innerClassProperty;

3) Add test case to PropertyUtilsTestCase:

     * Positive getPropertyDescriptor on property <code>innerClassProperty</code>.
    public void testGetDescriptorInnerClass() {
    	String propName = "innerClassProperty";
        try {
            PropertyDescriptor pd =
                    PropertyUtils.getPropertyDescriptor(bean, propName);
            assertEquals(TestBean.InnerClass.class, pd.getPropertyType());
        } catch (IllegalAccessException e) {
		} catch (InvocationTargetException e) {
		} catch (NoSuchMethodException e) {
        testGetDescriptorBase(propName, "getInnerClassProperty",

> PropertyUtilsTestCase.testGetReadMethod* fail for abstract properties.
> ----------------------------------------------------------------------
>                 Key: BEANUTILS-357
>                 URL:
>             Project: Commons BeanUtils
>          Issue Type: Bug
>          Components: Bean / Property Utils
>         Environment: Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
> Linux 2.6.24-22-generic #1 SMP Mon Nov 24 18:32:42 UTC 2008 i686 GNU/Linux
>            Reporter: Richard O'Sullivan
>         Attachments:, BEANUTILS-357-AbstractTestBean.patch
> Create org.apache.commons.beanutils.AbstractTestBean with abstract methods for properties
in TestBean and change TestBean to extend AbstractTestBean. Run PropertyUtilsTestCase, the
testGetReadMethod* methods fail because "Correct declaring class for X expected:<...Abstract...>
but was:<......>".

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