Hello, I have an application which was based on Jboss 4.0.3 SP1 configured with HTTPS connector. With that we have a rich client, downloadable via Java web start. Today we are migrating to Jboss 4.2.3. We have upgrade our Jboss and hibernate (3.1.3 -> 3.2.4 SP1) libraries. My problem is that my rich client does't start anymore : java.lang.NoClassDefFoundError: org/hibernate/proxy/pojo/javassist/JavassistLazyInitializer | at org.hibernate.proxy.pojo.javassist.SerializableProxy.readResolve(SerializableProxy.java:54) | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) | at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) | at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) | at java.lang.reflect.Method.invoke(Unknown Source) | at java.io.ObjectStreamClass.invokeReadResolve(Unknown Source) | at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) | at java.io.ObjectInputStream.readObject0(Unknown Source) | at java.io.ObjectInputStream.defaultReadFields(Unknown Source) | at java.io.ObjectInputStream.readSerialData(Unknown Source) | at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) | at java.io.ObjectInputStream.readObject0(Unknown Source) | at java.io.ObjectInputStream.readObject(Unknown Source) | at java.util.HashMap.readObject(Unknown Source) | at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source) | at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) | ... | at java.rmi.MarshalledObject.get(Unknown Source) | at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:134) | at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:365) | at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:197) | at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:61) | at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:70) | at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:112) | at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:100) | at $Proxy34.getFormationsForMonitoringBySystemUserAndFleet(Unknown Source) | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) | at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) | at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) | at java.lang.reflect.Method.invoke(Unknown Source) | at org.springframework.remoting.rmi.RmiClientInterceptorUtils.doInvoke(RmiClientInterceptorUtils.ja | va:106) | at org.springframework.ejb.access.SimpleRemoteSlsbInvokerInterceptor.doInvoke(SimpleRemoteSlsbInvok | erInterceptor.java:75) | at org.springframework.ejb.access.AbstractRemoteSlsbInvokerInterceptor.invoke(AbstractRemoteSlsbInv | okerInterceptor.java:114) | at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation. | java:169) | at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:169) | ... | I'v already check my classpath. The class which is not found, is contained in jbossallclient.jar and hibernate3.jar which is embedded with the rich client. And more : we can start the rich client from our eclipse project. I check that javassist.jar is added to the path. I'm wondering if this problem is not linked with secure container or something like that. But not; If I setup m yapplication for http, i get the same error. Thanks by advance for your help. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4175526#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...