I'm having a problem and I am ripping my hair out trying to resolve! We have an application that uses JSXB to marshall XML objects. We're using "jaxb-rt-1.0-ea.jar" and we include the JAR file in the application and in the CLASSPATH. Works perfectly in 4.0.4. I'm trying to get the application up in 4.2.2GA, and I get the following error: java.lang.NoSuchFieldError: INITIAL_COLOR javax.xml.bind.ValidatableObject.(ValidatableObject.java:32) javax.xml.bind.MarshallableObject.(MarshallableObject.java:54) javax.xml.bind.MarshallableRootElement.(MarshallableRootElement.java:97) This type of thing almost always happens when there is a mismatch between the classes it is compiled against as opposed to run against. However, I checked, and these classes exist only in "jaxb-rt-1.0-ea.jar" and nowhere else within JBoss. "jaxb-rt-1.0-ea.jar" is still inthe application, and in the CLASSPATH. Anybody have any idea what might be happening? Hopefully, it's just something dumb I'm doing. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4168806#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...