Hello All, I have following ear application structure: sample-app.ear | | META-INF | application.xml (cited in the end of this post) | MANIFEST.MF (containing: Class-Path: sample-logic-api.jar sample-model.jar sample-logic-.jar | | sample-model.jar | net.bzdyl.sample.model.Customer (simple entity with @Entity) | | sample-logic-api.jar | net.bzdyl.sample.logic.CustomerManager (simple interface with create/update/delete/query methods, no annotations) | | sample-logic-impl.jar | META-INF | persistence.xml (cited in the end of this post) | MANIFEST.MF (containig: Class-Path: sample-logic-api-.jar sample-model.jar | net.bzdyl.sample.logic.CustomerManagerBean (with @Remote(CustomerManager.class) @Stateless annotations) | When I am deploying it on JBoss 4.0.5.GA (with EARDeployer configured with Isolated=true) it is working fine. But when I am installing it on JBoss 5.0.0.Beta1 (default configuration) I am getting 21:24:37,891 ERROR [EJBRegistrationDeployer] Error during deployment: jar:file:/ C:/dev/java/jboss-5.0.0.Beta1/server/default/deploy/sample-app.ear!/ sample-logic-impl.jar java.lang.NoClassDefFoundError: net/bzdyl/sample/logic/CustomerManager during deployment process. Why? Thanks, Piotrek application.xml <?xml version="1.0" encoding="UTF-8"?> | <application xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/application_5.xsd" version="5"> | <description>Sample application</description> | <display-name>sample-ear</display-name> | <module> | <ejb>sample-logic-impl-.jar</ejb> | </module> | </application> | persistence.xml <persistence> | <persistence-unit name="SamplePU"> | <jta-data-source>java:/DefaultDS</jta-data-source> | <properties> | <property name="hibernate.hbm2ddl.auto" value="create-drop"/> | <property name="hibernate.show_sql" value="true"/> | </properties> | <class>net.bzdyl.sample.model.Customer</class> | </persistence-unit> | </persistence> | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4019018#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...