GWT - occasional com.google.gwt.user.client.rpc.SerializationException

Question

we are haunted by occasional occurences of exceptions such as:

com.google.gwt.user.client.rpc.SerializationException: Type \'xxx\' was not assignable

Answer 1

If you are running on JBoss, this might be due to the fact that the previously deployed application is not deleted when undeployed. To fix this, you must modify the following file in JBoss: ${JBOSS_HOME}/server/default/deployers/jbossweb.deployer/META-INF/war-deployers-jboss-beans.xml and set the following attribute to true: deleteWorkDirOnContextDestroy

When the previously deployed application is not cleaned up, GWT can be confused about which RPC file it needs to load and you end up with those SerializationException