7:22 p.m.
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)?
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