CDI and WELD suck

A @Stateless bean could not be injected because not found by WELD

org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied dependencies for type PersistenceService with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private com.pippo.pluto.paperino.rest.MafaldaController.persistenceService
  at com.pippo.pluto.paperino.rest.MafaldaController.persistenceService(MafaldaController.java:0)

 at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(Validator.java:362)
 at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:284)
 at org.jboss.weld.bootstrap.Validator.validateGeneralBean(Validator.java:137)
 at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:158)
 at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:501)
 at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(ConcurrentValidator.java:61)
 at org.jboss.weld.bootstrap.ConcurrentValidator$1.doWork(ConcurrentValidator.java:59)
 at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:62)
 at org.jboss.weld.executor.IterativeWorkerTaskFactory$1.call(IterativeWorkerTaskFactory.java:55)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)
 at org.jboss.threads.JBossThread.run(JBossThread.java:320)

https://docs.jboss.org/author/display/WFLY10/CDI+Reference

Even if the bean is a session bean, the archive (.jar) is not an “explicit bean archives (basically any archive containing the beans.xml file)“ because it doesn’t contain a beans.xml file (only the war file has a beans.xml file).

Since CDI 1.1 an archive can be implicit : “An implicit bean archive is any archive that contains one or more classes annotated with a bean defining annotation (scope annotation) or one or more session beans.”. Implicit archives don’t need a beans.xml.

But by default “implicit” is disabled! To enable it, you can either do the jboss-all.xml trick or do the “subsystem=weld:write-attribute(name=require-bean-descriptor,value=true)” trick. See again https://docs.jboss.org/author/display/WFLY10/CDI+Reference for more details. Or, you can simply add a beans.xml to the JAR.


If all this sounds to you like complete chaos and needless complication, it’s because it is!