Hi Jon,
Not easy to create a working example but hopefully this will help explain:
@Stateless
public class myEJb() {
@Inject
private UserContext userContext;
// Gets called from a JAX-RS context
public void go(AsyncResponse asyncResponse) {
CompletionStage<Foo> cs1 = userContext.doSomething();
cs1.thenAccept((Foo foo) -> {
... this is now on a different thread to the previous threads
CompletionStage<Bar> cs2 = userContext.doSomethingElse(foo) ...
this gets IllegalStateException
cs2.thenAccept((Bar bar) -> {
asyncResponse.resume(bar);
});
});
}
}
@RequestScoped
public class UserContext {
@Context
private HttpServletRequest httpRequest;
private Object someVal;
public CompletionStage<Foo> doSomething() {
...
...
Use httpRequest ... all OK
someVal = httpRequest.getAttribute("someVal");
...
}
public CompletionStage<Bar> doSomethingElse(Foo foo) {
...
...
if (someVal == null) {
// will go in here as someVal is null
someVal = httpRequest.getAttribute("someVal"); ...
java.lang.IllegalStateException: No CXF message usable for JAX-RS @Context
injections in that thread so can't use interface
javax.servlet.http.HttpServletRequest
}
...
}
}
Paul Carter-Brown
Director
Jini Guru
m: +27 (0) 83 442 7179 <+27834427179>
a: 1st Floor, Golf House, Design Quarter, Cnr. William Nicol and Leslie
Johannesburg, South Africa
w: jini.guru e: p...@jini.guru
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On Mon, Oct 7, 2019 at 2:29 PM Jonathan Gallimore <
jonathan.gallim...@gmail.com> wrote:
> Hi Paul
>
> You able to create an as small as possible sample, maybe based on
> https://github.com/apache/tomee/tree/master/examples/async-servlet? I'm
> struggling a little to picture the code in my head. It sounds likely
> related to the two different threads. I'm sure we can at least help figure
> out a workaround.
>
> Jon
>
> On Mon, Oct 7, 2019 at 1:01 PM Paul Carter-Brown
> <paul.carter-br...@jini.guru> wrote:
>
> > Hi,
> >
> > I have a scenario as follows:
> >
> > 1) JAX-RS request comes into TomEE 8.0.0 and hits a stateless EJB of mine
> > 2) The EJB has an object called UserContext injected which is
> > @RequestScoped
> > 3) userContext in turn injects HttpServletRequest with @Context
> > 4) I use userContext fine. All is good and it can access the
> > HttpServletRequest
> > 5) My EJB does a rest call to another system. This rest call uses
> asynhttp
> > with reactive programming and returns a CompletionStage.
> > 6) my EJB code does a .thenAccept on the completionstage and in this code
> > we try and use the injected UserContext. Here we get an error when
> > UserCOntext tries to use HttpServletRequest.
> >
> > java.lang.IllegalStateException: No CXF message usable for JAX-RS
> > @Context injections in that thread so can't use interface
> > javax.servlet.http.HttpServletRequest
> >
> >
> > I believe this is due to the completionstage being executed on a
> different
> > thread. E.g.. steps 1-5 use TomEE-Exec-1 while step 6 uses
> async-http-3-3.
> >
> > To resolve this I got UserContext to eagerly load the data it needs
> > from HttpServletRequest
> > in step 3 so that at step 6 no calls to HttpServletRequest are needed. It
> > seems though that the userContext is proxied by webbeans and I get a
> > different instance on the different thread and this new instance has none
> > of my eagerly loaded data in it.
> >
> > Does anyone know how to resolve this issue. Basically I want to somehow
> get
> > step 6 to use the exact instance of UserContext as step 2 even though
> they
> > are on different threads.
> >
> > Paul Carter-Brown
> > Director
> > Jini Guru
> > m: +27 (0) 83 442 7179 <+27834427179>
> > a: 1st Floor, Golf House, Design Quarter, Cnr. William Nicol and Leslie
> > Johannesburg, South Africa
> > w: jini.guru e: p...@jini.guru
> >
> > Disclaimer: This message and/or attachment(s) may contain
> > privileged, confidential and/or personal information. If you are not the
> > intended recipient you may not disclose or distribute any of
> > the information contained within this message. In such case you must
> > destroy this message and inform the sender of the error. Jini Guru may
> not
> > accept liability for any errors, omissions, information and viruses
> > contained in the transmission of this message. Any opinions, conclusions
> > and other information contained within this message not related to Jini
> > Guru official business is deemed to be that of the individual only and is
> > not endorsed by Jini Guru.
> >
>
