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From "Alexei Zakharov" <alexei.zakha...@gmail.com>
Subject [classlib][beans] RI inconsistency in EventHandler
Date Tue, 10 Oct 2006 17:27:06 GMT
Hi all,

Let me disturb you with another boring "RI inconsistency in beans"
–type of message. :) It seems I found a bug in RI.  In
java.beans.EventHandler. I think RI incorrectly determines properties
here. According to spec, common sense and even the RI's implementation
of java.beans.Introspector the following bean should not contain any

    public static class MyBean {
        public void setProp1() {}

because "setProp1()" is not a valid setter method – it does not
contain a new value to set.
However, the following test fails on RI:

import java.beans.*;

public class TestBeanInfo1 {
    public static class MyBean {
        public void setProp1() {}

    public static void main(String argv[]) throws Exception {
        MyBean bean = new MyBean();
        // "prop1" is neither the name of writeable property nor the
name of any public method
        Object proxy = EventHandler.create(
                PropertyChangeListener.class, bean, "prop1");

        // just to show that Introspector doesn't see the property
with name "prop1"
        PropertyDescriptor[] pds = Introspector.getBeanInfo(MyBean.class,
        for (int i = 0; i < pds.length; i++) {
            System.out.println("Property found: " + pds[i].getName());

        // should throw exception
        try {
            ((PropertyChangeListener) proxy).propertyChange(
                    new PropertyChangeEvent(bean, "prop1", "1", "2"));
        } catch (Throwable t) {

So it determines "prop1" as a valid property. IMHO this behavior is
inconsistent and we should not follow RI. But I like to hear opinions
from the rest of the community.


Alexei Zakharov,
Intel Middleware Product Division

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