Thanks Daniel. Long responses like these are hard for me to do on a mobile phone in a crowded Dutch train… 
Hello Ronald, hello Daniel,
thanks for your support. Due to Ronalds suggestion i tried to get it working, i tried the following things:
with the following producer:
But i get the following results:
when using activiti:class="…SimpleServiceTask", activiti:delegateExpression="${simpleServiceTask}" or activiti:expression="${simpleServiceTask.execute(execution)}" nothing is injected into the simpleServiceTask. emfJEE and emJEE which uses @Persistence* annotations remain null. Only emCDI references a bean which seems to be a delegate or proxy (org.jboss.weldx.persistence.EntityManager$-1697665317$Proxy$_$$_Weld$Proxy$), but using the reference with .persist() results in a null pointer exception:
And finally, looking up the entity manager using JNDI does not work either
On the JSF side i can use CDI without problems, with @Produces, @Resource, @Inject in all combinations.
Which leaves me with the big question mark above my head…
thanks for your support. Due to Ronalds suggestion i tried to get it working, i tried the following things:
public abstract class AbstractServiceTask implements JavaDelegate {
public AbstractServiceTask() { super(); }
protected EntityManager getEntityManager() {
EntityManager em = null;
try {
Context ic = new InitialContext();
em = (EntityManager) ic.lookup("java:comp/env/persistence/em");
} catch (NamingException e) {
// TODO
}
return em;
}
}
@Named
public class SimpleServiceTask extends AbstractServiceTask {
@Inject
@ErpEntityManager
private EntityManager emCDI;
@PersistenceUnit
private EntityManagerFactory emfJEE;
@PersistenceContext
private EntityManager emJEE;
public void execute(DelegateExecution execution) throws Exception {
TestEntity entity = new TestEntity();
entity.setCol((String)execution.getVariable("col"));
emCDI.persist(entity);
// emJEE.persist(entity);
// getEntityManager().persist(entity);
}
}
with the following producer:
@Qualifier
@Retention(RUNTIME)
@Target({METHOD, FIELD, PARAMETER, TYPE})
public @interface ErpEntityManager {
}
@Singleton
public class ErpEntityManagerProducer {
@Produces
@PersistenceContext
@ErpEntityManager
private EntityManager em;
}
But i get the following results:
when using activiti:class="…SimpleServiceTask", activiti:delegateExpression="${simpleServiceTask}" or activiti:expression="${simpleServiceTask.execute(execution)}" nothing is injected into the simpleServiceTask. emfJEE and emJEE which uses @Persistence* annotations remain null. Only emCDI references a bean which seems to be a delegate or proxy (org.jboss.weldx.persistence.EntityManager$-1697665317$Proxy$_$$_Weld$Proxy$), but using the reference with .persist() results in a null pointer exception:
org.jboss.weld.exceptions.NullInstanceException: WELD-000044 Unable to obtain instance from null
at org.jboss.weld.bean.builtin.CallableMethodHandler.invoke(CallableMethodHandler.java:48)
at org.jboss.weld.bean.proxy.EnterpriseTargetBeanInstance.invoke(EnterpriseTargetBeanInstance.java:56)
at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:105)
at org.jboss.weldx.persistence.EntityManager$-1697665317$Proxy$_$$_Weld$Proxy$.persist(EntityManager$-1697665317$Proxy$_$$_Weld$Proxy$.java)
at erp.domain.activiti.tasks.service.SimpleServiceTask.execute(SimpleServiceTask.java:46)
at org.activiti.engine.impl.delegate.JavaDelegateInvocation.invoke(JavaDelegateInvocation.java:34)
at org.activiti.engine.impl.delegate.DelegateInvocation.proceed(DelegateInvocation.java:37)
at org.activiti.cdi.impl.CdiProcessVariableFlushingDelegateInterceptor.handleInvocation(CdiProcessVariableFlushingDelegateInterceptor.java:36)
at org.activiti.engine.impl.bpmn.behavior.ServiceTaskDelegateExpressionActivityBehavior.execute(ServiceTaskDelegateExpressionActivityBehavior.java:61)
at org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:44)
at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:77)
at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:530)
at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:525)
And finally, looking up the entity manager using JNDI does not work either
On the JSF side i can use CDI without problems, with @Produces, @Resource, @Inject in all combinations.
Which leaves me with the big question mark above my head…
