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From "Oumar Aziz OUATTARA (JIRA)" <axis-...@ws.apache.org>
Subject [jira] Created: (AXIS-2775) ClassCastException in org.apache.axis.Message.setup()
Date Wed, 04 Feb 2009 09:23:59 GMT
ClassCastException in org.apache.axis.Message.setup()
-----------------------------------------------------

                 Key: AXIS-2775
                 URL: https://issues.apache.org/jira/browse/AXIS-2775
             Project: Axis
          Issue Type: Bug
          Components: Basic Architecture
    Affects Versions: 1.2
         Environment: Windows, Weblogic Server 10.0 MP1
            Reporter: Oumar Aziz OUATTARA


There is a class cast exception in this Class of Axis when casting to "Attachments". 

java.lang.ClassCastException: org.apache.axis.attachments.AttachmentsImpl
at org.apache.axis.Message.setup(Message.java:344)
at org.apache.axis.Message.(Message.java:246)
at org.apache.axis.soap.MessageFactoryImpl.createMessage(MessageFactoryImpl.java:54)
at test.TestBean.testingMethod(TestBean.java:38)

In fact the bug has been noticed on an old axis but it's still on the svn trunk :

<quotes>
attachImpl = ClassUtils.forName(attachImpName);
....
Constructor attachImplConstr = attachImpl.getConstructors()[0];
            try {
                mAttachments = (Attachments) attachImplConstr.newInstance(
                        new Object[] { initialContents,
                                       contentType, contentLocation});
....
</quotes>

The ClassUtils class is using dynamic classloading. and implements it well. The problem is,
using this mechanism, you can retrieve a Class object that doesn't come from the current class
loader. Then casting to Attachments, will try to cast to a Class from a different class loader.


To handle such a case, the JDK included a class called Proxy ( http://java.sun.com/j2se/1.5.0/docs/api/java/lang/reflect/Proxy.html
). Using this class should easily solve the issue.

Best Regards
wattazoum

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