In our code the lookup for the bean manager isn't directly the first call using the lambda expression within the parallel stream. It is being called in a class that is also used by other methods in other threads. I don't want to share the bean manager within the for/join-pool threads but because the code structure the lookup is necessary at a specific point.

Maybe follow code snippet and the error trace will show what I mean:

Code
_queryDocResults.parallelStream().forEach(r -> createDocumentEntry(r.getXdsObjectObjId(), r.getXdsObjectUUID(), r.getHome()));

Stack Trace
java.lang.RuntimeException: Couldn't get BeanManager through JNDI Lookup
at marabu.common.tools.CDIHelper.getCDIInstance(CDIHelper.java:31)
at marabu.pegasos.server.ihe.xds_b.tools.XDSInfosetHelper.createPatientIdExternalIdentifier(XDSInfosetHelper.java:721)
at marabu.pegasos.server.ihe.xds_b.core.spi.metadata.XDSDocumentEntry.<init>(XDSDocumentEntry.java:280)
at marabu.pegasos.server.ihe.xds_b.core.service.helper.query.registry.AbstractQuery.createDocumentEntry(AbstractQuery.java:637)
at marabu.pegasos.server.ihe.xds_b.core.service.helper.query.registry.AbstractQuery.lambda$buildQueryResponseObjects$4(AbstractQuery.java:572)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.ForEachOps$ForEachTask.compute(ForEachOps.java:291)
at java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:731)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Caused by: javax.naming.NameNotFoundException: java:comp/BeanManager
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at javax.naming.InitialContext.doLookup(InitialContext.java:290)
at marabu.common.tools.CDIHelper.getCDIInstance(CDIHelper.java:28)
... 13 more

Within the method XDSInfosetHelper.createPatientIdExternalIdentifier() the lookup for the bean manager is needed because the XDSInfosetHelper is not a managed bean instance. In the class CDIHelper the lookup is done. I use this helper class when I don't have a managed bean as source but I want to access a managed bean.
The error is the same as I would write follow:

_Thread th = new Thread() {

public void run()

};_

As described in the weld documentation the Bean Manager is only available in a managed environment. When I would use a managed thread this the lookup would work. But I can't create a Managed Thread when using the ForkJoinPool.