We get an exception if we try to remote execute a method of an EAR from another EAR if the method, we want to execute, expects a parameter which type is in both ear lib folders and the JBoss modules folder.

Example:
If we have the joda-time.jar in our ear lib folder and want to execute a method like

public void setTimeZone( DateTimeZone zone );

in another ear we get the following exception

java.lang.IllegalArgumentException: object is not an instance of declaring class.

We tried to exclude the joda-time module in the deployment-structure.xml but that did not work. Only solution is to remove the joda-time.jar from both ear lib folders but that is not practicable for us.

Some further information and a test project top reproduce the problem are in the linked thread.