[jboss-dev-forums] [JBoss AS7 Development] - Re: META-INF/services for module extensions - question/issue

[Dan Sirbu]

Dan Sirbu [http://community.jboss.org/people/lmcdasi] created the discussion

"Re: META-INF/services for module extensions - question/issue"

To view the discussion, visit: http://community.jboss.org/message/626976#626976

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Brian,

   Unfortunately it looks like I have to come back:

(a) When I do remote debugging on the TCCL Service load I start to have the following exception. I recall being able to debug that until I am getting this behaviour. If I disable the remote debugging the startup is ok. 

16:22:50,138 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-10) MSC00001: Failed to start service jboss.as.test.singleton: org.jboss.msc.service.StartException in service jboss.as.test.singleton: Failed to start service
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1780) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_26]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_26]
        at java.lang.Thread.run(Thread.java:662) [:1.6.0_26]
Caused by: java.util.NoSuchElementException
        at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:340) [:1.6.0_26]
        at java.util.ServiceLoader$1.next(ServiceLoader.java:421) [:1.6.0_26]
        at com.moduleext.jboss.extension.services.TCCLSingletonService.start(TCCLSingletonService.java:91)
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
        ... 3 more

(b) Beside M1, I do have M2. Both implement the same interface for the ServiceLoader. The first kickstarts ok but the second fails with CastException tough I am sure I did not mess around with the class type definition.

16:28:42,273 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-15) MSC00001: Failed to start service jboss.as.modext.singleton: org.jboss.msc.service.StartException in service jboss.as.modext.singleton: Failed to start service
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1780) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_26]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_26]
        at java.lang.Thread.run(Thread.java:662) [:1.6.0_26]
Caused by: java.util.ServiceConfigurationError: com.test.jboss.module.ifc.TestModuleIfc: Provider com.test.jboss.test.impl.TestModuleTwoImpl could not be instantiated: java.lang.ClassCastException
        at java.util.ServiceLoader.fail(ServiceLoader.java:207) [:1.6.0_26]
        at java.util.ServiceLoader.access$100(ServiceLoader.java:164) [:1.6.0_26]
        at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:353) [:1.6.0_26]
        at java.util.ServiceLoader$1.next(ServiceLoader.java:421) [:1.6.0_26]
        at com.ericsson.modext.jboss.extension.services.TCCLSingletonService.start(TCCLSingletonService.java:91)
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
        ... 3 more
Caused by: java.lang.ClassCastException
        at java.lang.Class.cast(Class.java:2990) [:1.6.0_26]
        at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:345) [:1.6.0_26]
        ... 7 more

The code snipet:

List<MyModule> myList = this.getModules();
Iterator<MyModule> myIter = myList.iterator();
while(myIter.hasNext()) {
       MyModule mmodule = myIter.next();
       ModuleIdentifier moduleIdentifier = mmodule.getIdentifier();

       log.info("TCCLSingletonService -- > starting module: " + moduleIdentifier.getName());

       try {
                  Module module = Module.getCallerModuleLoader().loadModule(moduleIdentifier);
                  ServiceLoader<?> serviceLoader = module.loadService(TestModuleIfc.class);
                  Iterator<?> serviceIter = serviceLoader.iterator();
                  while(serviceIter.hasNext()) {
                           ((TestModuleIfc) serviceIter.next()).start(context);
                  }
      } catch () {
                  ...................
      }
}
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