Context lost when using StreamingOutput

[kafeukleu]

Hello,

I would like to stream a Response using StreamingOutput but the context seems to be lost when doing so. In a @Stateless class with a logic @ApplicationScoped injected.

So, in my case, this would work (simplified) :

public String noStream(Filter filter) { 
     ... 
     logic.getById(filter)); 
     ... 
}

And this would fail when calling the logic:

public StreamingOutput stream(Filter filter) { 
     return new StreamingOutput() {  
          @Override public void write(OutputStream os) throws IOException, WebApplicationException { 
               ... 
               logic.getById(filter)); 
               ... 
          } 
     }; 
}

Error message :

WELD-001303: No active contexts for scope type javax.transaction.TransactionScoped

Obvioulsy, "logic" triggers plenty subcalls but is there something I can do on this level to keep the context somehow ?

Thanks in advance.

[mkouba]

Hi Tino,

the problem is that normal scopes (such as @TransactionScoped) are associated with the current thread and usually don't propagate. In your case, it's JTA impl which provides the CDI context. So I would probably start with finding out when  StreamingOutput#write() is invoked and read the JTA spec to find details about when the transaction context is active (and whether it propagates, i.e. if it can be associated with more threads).