Jdom 1.0 && (Jboss 4.01 || Jboss 4.0) incompatibility

[dhinojosa]

I have this situation where I receieve the following error:

java.lang.VerifyError: (class: com/xyzcorp/project/Application, method: toXML signature: ()Lorg/jdom/Element;) Incompatible argument to function

This comes from a standard java bean that I have called Application. In this application I have a toXML method that returns a org.jdom.Element element.

The version I am working with is JBoss 4.0.1 with JDK1.5.0. The OS with this problem is an unknown distro of linux. The JDOM version I am working with is 1.0.

This problem occurs in a standalone war file. In other words, this war is not encapsulated in an ear file. The jdom.jar file is located in the WEB-INF/lib directory of the war file.

I have attempted the following things:
* Removed the info.xml from the jdom.jar
* Installed a jdom.jar in the <server-root>/lib directory

None of these worked. I hope that someone in jboss land can help.

Thanks,
Danno

[dhinojosa]

What I found out is that if you have a war that uses specific jars like jdom.jar then you need to deploy that first. After you deploy all the wars, then deploy all the ear files. Though I have not researched it better, I think there there is a different class loading mechanism for ears than for wars.