Some updates: I created a new jar file from the old one but added the NoResultException. In this way I got rid of the ClassNotFoundExceptions but I'm getting some other strange errors now. This is the coding I'm using to start the embedded server: EJB3StandaloneBootstrap.boot(null); | EJB3StandaloneDeployer deployer = new EJB3StandaloneDeployer(); deployer.getArchivesByResource().add("META-INF/persistence.xml"); | // need to set the InitialContext properties that deployer will use | // to initial EJB containers | deployer.setJndiProperties(getInitialContextProperties()); | | deployer.create(); | deployer.start(); An error then occurs at deployer.create(). The warnings and exceptions looks like this: [testng] WARN 18-12 19:55:31,321 (JBossEntityResolver.java:getLocalEntityName:201) -Entity is not registered, publicId=null systemId=file:/C:/dev/project/ejb/embedded_jboss_alpha/conf/bean-deployer_1_0.xsd | [testng] WARN 18-12 19:55:31,337 (SaxJBossXBParser.java:warning:226) -schema_reference.4: Failed to read schema document 'bean-deployer_1_0.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. @ file:/C:/dev/project/ejb/embedded_jboss_alpha/conf/embedded-jboss-beans.xml[5,45] | [testng] WARN 18-12 19:55:32,399 (JBossEntityResolver.java:getLocalEntityName:201) -Entity is not registered, publicId=null systemId=http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd | [testng] WARN 18-12 19:55:33,978 (JBossEntityResolver.java:getLocalEntityName:201) -Entity is not registered, publicId=null systemId=http://java.sun.com/xml/ns/javaee/javaee_5.xsd | [testng] WARN 18-12 19:55:34,446 (JBossEntityResolver.java:getLocalEntityName:201) -Entity is not registered, publicId=null systemId=http://java.sun.com/xml/ns/javaee/javaee_web_services_client_1_2... | [testng] FAILED: startEjbServer | [testng] java.lang.NullPointerException | [testng] at org.jboss.ejb3.Ejb3DescriptorHandler.isEjb(Ejb3DescriptorHandler.java:129) | [testng] at org.jboss.ejb3.Ejb3Deployment.deployElement(Ejb3Deployment.java:310) | [testng] at org.jboss.ejb3.Ejb3Deployment.deployElement(Ejb3Deployment.java:300) | [testng] at org.jboss.ejb3.Ejb3Deployment.deployUrl(Ejb3Deployment.java:282) | [testng] at org.jboss.ejb3.Ejb3Deployment.deploy(Ejb3Deployment.java:253) | [testng] at org.jboss.ejb3.Ejb3Deployment.create(Ejb3Deployment.java:240) | [testng] at org.jboss.ejb3.embedded.EJB3StandaloneDeployer.create(EJB3StandaloneDeployer.java:390) | [testng] at test.EJBLifeCycle.startEjbServer(Unknown Source) I used the jboss embeddable alpha_5 before and there everything worked perfect and I had no problems like this. The problem with alpha_5 was that the @EntityResult annotation wasn't updated to the spec. Does anyone have an idea about what could be wrong? The application is, by the way, working when I deploy it in JBoss AS. Thanks in advance /klejs View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3994771#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...