Can not getReadMethod a jdk 1.5 bug?

Question

import junit.framework.TestCase;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import org.apache.taglibs.standard.lang.jstl.BeanInfoManager;
import org.apache.taglibs.standard.lang.jstl.BeanInfoProperty;
import org.apache.taglibs.standard.lang.jstl.ELException;
import org.apache.taglibs.standard.lang.jstl.Logger;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.PrintStream;
public class BeanInfoPropertyTest extends TestCase {
public Integer[] getPro1() {
return null;
public Integer[] getPro1(String n) {
return null;
public Integer[] getPro2() {
return null;
public Integer[] getPro2(int n) {
return null;
// public void testPro1() throws ELException {
// BeanInfoProperty property = BeanInfoManager.getBeanInfoProperty(BeanInfoPropertyTest.class,
// "pro1", new Logger(new PrintStream(System.out)));
// System.out.println(ToStringBuilder.reflectionToString(property,
// ToStringStyle.MULTI_LINE_STYLE, true));
// assertNotNull(property.getReadMethod());
// public void testPro2() throws ELException {
// BeanInfoProperty property = BeanInfoManager.getBeanInfoProperty(BeanInfoPropertyTest.class,
// "pro2", new Logger(new PrintStream(System.out)));
// System.out.println(ToStringBuilder.reflectionToString(property,
// ToStringStyle.MULTI_LINE_STYLE, true));
// assertNotNull(property.getReadMethod());
public void testC() {
     Class c=BeanInfoPropertyTest.class;
try {
BeanInfo tagClassInfo = Introspector.getBeanInfo(c);
PropertyDescriptor[] pd = tagClassInfo.getPropertyDescriptors();
for (int i = 0; i < pd.length; i++) {
String name = pd.getName();
System.err.println(name + " displayName = " +
pd[i].getDisplayName());
System.err.println(name + " propertyType = " +
pd[i].getPropertyType());
System.err.println(name + " readMethod = " +
pd[i].getReadMethod());
System.err.println(name + " writeMethod = " +
pd[i].getWriteMethod());
} catch (Throwable v) {
v.printStackTrace();
result test with jdk1.4.2_05
class displayName = class
class propertyType = class java.lang.Class
class readMethod = public final native java.lang.Class java.lang.Object.getClass()
class writeMethod = null
name displayName = name
name propertyType = class java.lang.String
name readMethod = public java.lang.String junit.framework.TestCase.getName()
name writeMethod = public void junit.framework.TestCase.setName(java.lang.String)
pro1 displayName = pro1
pro1 propertyType = class [Ljava.lang.Integer;
pro1 readMethod = public java.lang.Integer[] com.alibaba.waf.tag.BeanInfoPropertyTest.getPro1()
pro1 writeMethod = null
pro2 displayName = pro2
pro2 propertyType = class [Ljava.lang.Integer;
pro2 readMethod = public java.lang.Integer[] com.alibaba.waf.tag.BeanInfoPropertyTest.getPro2()
pro2 writeMethod = null
result test with jdk1.5.0_6
class displayName = class
class propertyType = class java.lang.Class
class readMethod = public final native java.lang.Class java.lang.Object.getClass()
class writeMethod = null
name displayName = name
name propertyType = class java.lang.String
name readMethod = public java.lang.String junit.framework.TestCase.getName()
name writeMethod = public void junit.framework.TestCase.setName(java.lang.String)
pro1 displayName = pro1
pro1 propertyType = class [Ljava.lang.Integer;
pro1 readMethod = public java.lang.Integer[] com.alibaba.waf.tag.BeanInfoPropertyTest.getPro1()
pro1 writeMethod = null
pro2 displayName = pro2
pro2 propertyType = null
pro2 readMethod = null
pro2 writeMethod = null
Why pro2 readMethod is null ,can anyone explain it

Answer 1

i change the code ,but the result not change
What?
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Kaj