Hi y'all!

I just stumbled upon the following problem and I'm not sure whether it's according to the specification (just getting started with weld) or whether it's a bug.

When a bean includes a method where within a lambda expression an anonymous inner class is created, the initalization of the weld container fails.

Here's a simple demonstration:

Create a class containing the anonymous inner class:

import java.util.function.Supplier;

public class Demo {
        // a random method - it doesn't have to be called
    public Supplier<Object> getSupplier() {
        // probably any lambda will do - using supplier as simple example  
        final Supplier<Object> s = () -> {
                        // this causes the problem - the anonymous new object
            return new Object(){                              
                public String toString() {
                    return "";
                };
            };
        };              
        return s;
    }  
}

Then try to initialize weld in a different class:

import org.jboss.weld.environment.se.Weld;
import org.jboss.weld.environment.se.WeldContainer;

public class Application {
    public static void main(String[] args) {
        final Weld weld = new Weld();
        try(final WeldContainer c = weld.initialize()){          
        };
    }
}

As a result you should (hopefully) get this error:

Exception in thread "main" org.jboss.weld.exceptions.DeploymentException: Enclosing method not found
    at org.jboss.weld.executor.AbstractExecutorServices.checkForExceptions(AbstractExecutorServices.java:66)
    at org.jboss.weld.executor.AbstractExecutorServices.invokeAllAndCheckForExceptions(AbstractExecutorServices.java:43)
    at org.jboss.weld.executor.AbstractExecutorServices.invokeAllAndCheckForExceptions(AbstractExecutorServices.java:51)
    at org.jboss.weld.bootstrap.ConcurrentBeanDeployer.createClassBeans(ConcurrentBeanDeployer.java:75)
    at org.jboss.weld.bootstrap.BeanDeployment.createBeans(BeanDeployment.java:256)
    at org.jboss.weld.bootstrap.WeldStartup.deployBeans(WeldStartup.java:396)
    at org.jboss.weld.bootstrap.WeldBootstrap.deployBeans(WeldBootstrap.java:83)
    at org.jboss.weld.environment.se.Weld.initialize(Weld.java:584)
    at anonymous_inner_class_weld.Application.main(Application.java:10)
Caused by: java.lang.InternalError: Enclosing method not found
    at java.lang.Class.getEnclosingMethod(Unknown Source)
    at org.jboss.weld.util.reflection.Reflections.isStaticNestedClass(Reflections.java:402)
    at org.jboss.weld.util.reflection.Reflections.isTopLevelOrStaticNestedClass(Reflections.java:422)
    at org.jboss.weld.util.Beans.isTypeManagedBeanOrDecoratorOrInterceptor(Beans.java:506)
    at org.jboss.weld.bootstrap.BeanDeployer.createClassBean(BeanDeployer.java:213)
    at org.jboss.weld.bootstrap.ConcurrentBeanDeployer$2.doWork(ConcurrentBeanDeployer.java:78)
    at org.jboss.weld.bootstrap.ConcurrentBeanDeployer$2.doWork(ConcurrentBeanDeployer.java:75)
    at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:63)
    at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:56)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

A work-around is moving the creation of the anonymous class into another method:

import java.util.function.Supplier;

public class Demo {
    public Supplier<Object> getSupplier() {          
        final Supplier<Object> s = this::getNewObject;          
        return s;
    }  
  
    public Object getNewObject(){
        return new Object(){
            public String toString() {
                return "";
            };
        };
    }
}

I'd appreciate any insight into the nature of the problem!

Thank you!

P.S.:

I'm using jdk1.8.0_91.