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From "Svetlana Samoilenko (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-402) java.beans.Beans.InstanceOf(Object bean,Class targetType) method works incorrectly
Date Mon, 24 Apr 2006 12:37:06 GMT
java.beans.Beans.InstanceOf(Object bean,Class targetType) method works incorrectly
----------------------------------------------------------------------------------

         Key: HARMONY-402
         URL: http://issues.apache.org/jira/browse/HARMONY-402
     Project: Harmony
        Type: Bug

  Components: Classlib  
    Reporter: Svetlana Samoilenko


Accodring to java 1.4.2 and 1.5 specifications  java.beans.Beans.InstanceOf(Object bean,Class
targetType) method returns "true" if the given bean supports the given targetType.
As a result  isInstanceOf(Object bean, null) should return false.
Harmony throws NPE in this case and returns false for correct non-null targetType.
 
Code for reproduce: 
Put ObjectBean class in the same directory as the test.

import java.beans.Beans; 
import java.io.*; 
 
public class test { 
    public static void main(String[] args) { 
             ObjectBean bean = new ObjectBean();
 
             try {
                 Class targetType = Externalizable.class;
                 //correct non-null targetType
                 System.out.println("***"+Beans.isInstanceOf(bean, targetType));         
          
             } catch (Exception e) {
                 e.printStackTrace();   
             }
             
             try {
                 Class targetType = null;
                 // null targetType
                 System.out.println("***"+Beans.isInstanceOf(bean, targetType));
             } catch (Exception e) {
                 e.printStackTrace();   
             } 
       } 
} 
 
class ObjectBean implements Externalizable {
    public void writeExternal(ObjectOutput out) {}; 
    public void readExternal(ObjectInput in){};
}

Harmony output: 
***false
java.lang.NullPointerException
        at java.lang.Class.isAssignableFrom(Native Method)
        at java.beans.Beans.isInstanceOf(Beans.java:147)
        at test.main(test.java:18)

BEA optput: 
***true
***false
 


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