Local Interface inherited by extending abstract class: canno
Hello,
I just stumbled upon a strange behaviour regarding a stateless session bean. I'm using Jboss 4.0.5 GA, JDK 5.0 and have an enterprise application with a Stateless Session Bean structered like this:
@Local
interface Logic {
void foo();
}
abstract class AbstractLogic implements Logic {
void foo() {
bar();
}
abstract void bar();
}
@Stateless
class LogicBean extends AbstractLogic {
void bar();
}
When I deploy my application, I get the following error during compile time:
java.lang.RuntimeException: bean class has no local, webservice, or remote interfaces defined and does not implement at least one business interface at org.jboss.ejb3.ProxyFactoryHelper.getLocalInterfaces(ProxyFactoryHelper.java:107) at org.jboss.ejb3.ProxyDeployer.initializeLocalBindingMetadata(ProxyDeployer.java:115) at org.jboss.ejb3.SessionContainer.instantiated(SessionContainer.java:110) at org.jboss.ejb3.Ejb3Deployment.deployElement(Ejb3Deployment.java:415) at org.jboss.ejb3.Ejb3Deployment.deployElement(Ejb3Deployment.java:397) at org.jboss.ejb3.Ejb3Deployment.deployUrl(Ejb3Deployment.java:378) at org.jboss.ejb3.Ejb3Deployment.deploy(Ejb3Deployment.java:350) at org.jboss.ejb3.Ejb3Deployment.create(Ejb3Deployment.java:305) at org.jboss.ejb3.Ejb3Module.createService(Ejb3Module.java:77) at org.jboss.system.ServiceMBeanSupport.jbossInternalCreate(ServiceMBeanSupport.java:260) at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:243) at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.server.Invocation.invoke(Invocation.java:86) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978) at $Proxy0.create(Unknown Source) at org.jboss.system.ServiceController.create(ServiceController.java:330) at org.jboss.system.ServiceController.create(ServiceController.java:273) at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.server.Invocation.invoke(Invocation.java:86) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210) at $Proxy29.create(Unknown Source) at org.jboss.ejb3.EJB3Deployer.create(EJB3Deployer.java:429) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142) at org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:97) at org.jboss.system.InterceptorServiceMBeanSupport.invokeNext(InterceptorServiceMBeanSupport.java:238) at org.jboss.ws.integration.jboss.DeployerInterceptor.create(DeployerInterceptor.java:74) at org.jboss.ws.integration.jboss.DeployerInterceptorEJB.create(DeployerInterceptorEJB.java:44) at org.jboss.deployment.SubDeployerInterceptorSupport$XMBeanInterceptor.create(SubDeployerInterceptorSupport.java:180) at org.jboss.deployment.SubDeployerInterceptor.invoke(SubDeployerInterceptor.java:91) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210) at $Proxy30.create(Unknown Source) at org.jboss.deployment.MainDeployer.create(MainDeployer.java:969) at org.jboss.deployment.MainDeployer.create(MainDeployer.java:959) at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:818) at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782) at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210) at $Proxy8.deploy(Unknown Source) at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:421) at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:634) at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:263) at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loop(AbstractDeploymentScanner.java:274) at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run(AbstractDeploymentScanner.java:225)
When I change the definition of the bean like this (adding just an expliciz implements Logic):
class LogicBean extends AbstractLogic implements Logic {
}everything deploys just fine.
Now I wonder how that could be? Doesn't LogicBean already implement Logic indirectly by extending AbstractLogic? You sure could write something like this, and it would certainly compile:
Logic l = new LogicBean();
I would consider this a bug in Jboss' interface detection, or is there some rarely seen rule in the Java language specification I never heard of (I'm sure there are quite some of them)?
