Hello, I am using JBoss 4.0.4GA with EJB3.0 RC 8 I want to deploy an application split into multiple components. The aim is to be able to redeploy one component without touching the others (of course only for unchanged interfaces). The components communicate using Stateless Session Beans. With the JBoss flat class-loading model this is not possible, because of class-loader errors after redeploying one component. So I decided to use isolated EARs for each component. Following the tips at http://wiki.jboss.org/wiki/Wiki.jsp?page=CommonHurdlesAndDifficultiesYouM... I adjusted "conf/jboss-service.xml" and "deploy/ear-deployer.xml" to use isolation and CallByValue. Each EAR has its own loader-repository defined in "META-INF/jboss-app.xml" I got thinks working as long as the parameters are of simple type (like String). Even complex types work as long as they are defined outside of the EAR, e.g. "HashMap". I use an simple type defined inside the EAR, like public class MyType implements Serializable { public String data; } void f(String) -> works | void f(HashMap) -> works | void f(MyType) -> works component (which means different EARs and different loader-repositories): void f(String) -> works | void f(HashMap) -> works | void f(MyType) -> fails the following exception is thrown when proxy.f(myType) is called via the local interface: Caused by: java.lang.IllegalArgumentException: Wrong target. class pkg.MyBean for public java.lang.String pkg.MyBean.f(pkg.MyType) | at org.jboss.aop.joinpoint.MethodInvocation.handleErrors(MethodInvocation.java:141) | at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:116) | at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166) | at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63) | at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54) | at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47) | at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126) | ... 55 more using the remote interface yields: Caused by: java.lang.NoClassDefFoundError | at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:57) | at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102) | at $Proxy138.processDto(Unknown Source) | at pkg.MyBean.f(MyBean.java:97) | ... The same problem was mentioned at http://jboss.com/index.html?module=bb&op=viewtopic&p=3950618 So my final question is: ======================== "Is it possible to call SLSBs from other SLSBs in isolated EARs with user defined Types?" Best regards, feri View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3969466#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...