I have this problem in my aplication when I try to generate a List from my database. Caused by: java.io.InvalidClassException: org.hibernate.collection.PersistentSet ; local class incompatible: stream classdesc serialVersionUID = 3994781329260376 240, local class serialVersionUID = 7442467225843903080 at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:546) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:155 1) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1465) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1 698) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:19 17) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1841) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1 718) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349) at org.hibernate.util.SerializationHelper.deserialize(SerializationHelpe r.java:210) but, when this code public static void main(String[] args) { ClassLoader tcl = Thread.currentThread().getContextClassLoader(); try { Class srp = tcl.loadClass("org.hibernate.collection.PersistentSet"); System.out.println(srp.getProtectionDomain().getCodeSource()); ObjectStreamClass osc = ObjectStreamClass.lookup(srp); System.out.println("getSerialVersionUID: "+osc.getSerialVersionUID()); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } I have this answer in my console (file:/C:/Arquivos%20de%20programas/jboss-4.0.4.GA/server/default/lib/hibernate3.jar <no signer certificates>) getSerialVersionUID: 7442467225843903080 I don´t have any trouble with teh same .ear in other jboss Someone can Help? thanKs View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4000515#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...