2 Replies Latest reply on Sep 7, 2015 8:06 AM by sebek64

    Incompatibility of java 8u60, CDI observer method and lambda expressions

    sebek64
    sebek64 Sep 4, 2015 12:20 PM

      Hi.

       

      It seems that java release 8u60 breaks the following scenario. Create an CDI observer method, write a lambda expression inside it, and use the observed parameter inside the lambda.

       

      Here is a short example:

       

      public void handle(@Observes SomeEvent event) {

              someMethod(optional.ifPresent(param -> {

                      switch (event.getType()) {

                              case A:

                                      param.A();

                                      break;

                      }

              });

      }

       

      The resulting error may differ, but basically I got the following two types of error during deployment:

       

      Caused by: org.jboss.weld.exceptions.DefinitionException: WELD-000088: Observer method must be static or local business method:  [EnhancedAnnotatedMethodImpl] private Handler.lambda$handle$150(@Observes SomeEvent, Param) on [EnhancedAnnotatedTypeImpl] public @Singleton @ConcurrencyManagement class Handler

              at org.jboss.weld.bean.SessionBean.checkObserverMethods(SessionBean.java:205)

              at org.jboss.weld.bean.SessionBean.internalInitialize(SessionBean.java:100)

              at org.jboss.weld.bean.RIBean.initialize(RIBean.java:69)

              at org.jboss.weld.bootstrap.ConcurrentBeanDeployer$5.doWork(ConcurrentBeanDeployer.java:121)

              at org.jboss.weld.bootstrap.ConcurrentBeanDeployer$5.doWork(ConcurrentBeanDeployer.java:118)

              at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:60)

              at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:53)

              at java.util.concurrent.FutureTask.run(FutureTask.java:266) [rt.jar:1.8.0_60]

              ... 3 more

       

       

      Caused by: org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied dependencies for type Param with qualifiers @Default

        at injection point [BackedAnnotatedParameter] Parameter 3 of [BackedAnnotatedMethod] private static Handler.lambda$handle$210(@Observes SomeEvent, Param)

        at Handler.lambda$handle$210(Handler.java:0)

      WELD-001475: The following beans match by type, but none have matching qualifiers:

        - Session bean [class SomeParam with qualifiers [@Provider @Any]; local interfaces are [Param]

       

              at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(Validator.java:359)

              at org.jboss.weld.bootstrap.ConcurrentValidator$4.doWork(ConcurrentValidator.java:108)

              at org.jboss.weld.bootstrap.ConcurrentValidator$4.doWork(ConcurrentValidator.java:103)

              at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:60)

              at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:53)

              at java.util.concurrent.FutureTask.run(FutureTask.java:266) [rt.jar:1.8.0_60]

              ... 3 more

       

      The type of error depends on the fact whether the bean of type @Default Param is available or not.

       

      I guess that this regression might be related to one of those fixes, but there are several other fixes related to lambdas:

      http://bugs.java.com/view_bug.do?bug_id=8037546

      http://bugs.java.com/view_bug.do?bug_id=8058227

       

      I use gradle for compilation, and '-parameters' parameter is not passed to javac. I run on wildfly 9.0.1.

       

      This may be a bug both in weld or in javac, I cannot decide. Any suggestions where to report this bug are welcome.