AbstractClassFactory runs into NullPointerException

Caused by: java.lang.NullPointerException
          at org.jboss.invocation.proxy.AbstractClassFactory.defineClass(AbstractClassFactory.java:150)
          at org.jboss.invocation.proxy.AbstractProxyFactory.getCachedMethods(AbstractProxyFactory.java:118)
          at org.jboss.as.ejb3.component.stateless.StatelessComponentDescription$2.configure(StatelessComponentDescription.java:121)
          at org.jboss.as.ee.component.ComponentDescription$DefaultFirstConfigurator.configure(ComponentDescription.java:778)
          at org.jboss.as.ee.component.EEModuleConfigurationProcessor.deploy(EEModuleConfigurationProcessor.java:65)
          at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:115)
          ... 5 more