IncompatibleClassChangeError when deploying Axis 1.2-RC3 on WebSphere 5.1 with
PARENT_FIRST classloading
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Key: AXIS-1903
URL: http://issues.apache.org/jira/browse/AXIS-1903
Project: Axis
Type: Bug
Components: SAAJ
Versions: 1.2RC3
Environment: WebSphere 5.1.x on Linux (2.4.x kernel).
Reporter: David Tompkins
I am deploying Axis 1.2RC3 in a war that resides within an ear. The axis jars
are in the war/WEB-INF/lib dir. For various reasons related to the other
contents of my ear, I must use PARENT_FIRST classloading. As many have
reported, if you have PARENT_FIRST classloading on WebSphere 5.1 with Axis
1.2RC3, then there is a conflict between the version of saaj (1.1) that ships
with WebSphere, and the version of saaj (1.2) that Axis 1.2RC3 expects, and you
get the following exception:
java.lang.IncompatibleClassChangeError: class org.apache.axis.SOAPPart does not
implement interface org.w3c.dom.Document
This issue can be resolved with PARENT_LAST classloading and a manifest which
specifies the classpath...but for those of use who can't use PARENT_LAST
classloading, there is another option.
It appears that a single source code change to Axis will eliminate the issue
altogether. The offending code is in
org.apache.axis.message.MessageElement.addTextNode(), and can be patched as
follows:
OLD CODE:
public SOAPElement addTextNode(String s) throws SOAPException {
try {
Text text = getOwnerDocument().createTextNode(s);
((org.apache.axis.message.Text)text).setParentElement(this);
return this;
} catch (ClassCastException e) {
throw new SOAPException(e);
}
}
PATCHED CODE:
public SOAPElement addTextNode(String s) throws SOAPException {
try {
Text text = new org.apache.axis.message.Text(s);
this.appendChild(text);
return this;
} catch (ClassCastException e) {
throw new SOAPException(e);
}
After making this change, Axis 1.2RC3 will run on WebSphere 5.1 with
PARENT_FIRST classloading, and no exceptions will be thrown.
-DT
---------------------------------
David Tompkins
Sr. Computer Scientist
Adobe Systems, Inc.
tompkins _AT_ adobe _DOT_ com
http://www.dt.org/
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