3 Replies Latest reply on Oct 14, 2013 8:24 PM by csa

NPE in JAX-RS marshaling with Errail 2.4.1

hr.stoyanov Oct 14, 2013 5:01 AM

Hello,

I am getting the following NPE during JAX-RS marshaling the response from the server. I ma basically returning an array list of portable objects. I can see clearly in dev console of Chrome the reponse coming Ok with all the data.

Any clue? Thanks in advance.

======================================================================================

00:00:56.874 [ERROR] Uncaught exception escaped

java.lang.NullPointerException: null

at org.jboss.errai.marshalling.client.marshallers.ListMarshaller.doDemarshall(ListMarshaller.java:47)

at org.jboss.errai.marshalling.client.marshallers.ListMarshaller.doDemarshall(ListMarshaller.java:1)

at org.jboss.errai.marshalling.client.marshallers.AbstractCollectionMarshaller.doDemarshall(AbstractCollectionMarshaller.java:48)

at org.jboss.errai.marshalling.client.marshallers.AbstractCollectionMarshaller.doDemarshall(AbstractCollectionMarshaller.java:1)

at org.jboss.errai.marshalling.client.marshallers.AbstractBackReferencingMarshaller.demarshall(AbstractBackReferencingMarshaller.java:76)

at org.jboss.errai.marshalling.client.Marshalling.fromJSON(Marshalling.java:167)

at org.jboss.errai.enterprise.client.jaxrs.MarshallingWrapper.fromJSON(MarshallingWrapper.java:67)

at org.jboss.errai.enterprise.client.jaxrs.JaxrsProxyLoaderImpl$1com_peruncs_s4g_web_gwt_shared_ScreensManagerImpl$2.demarshallResponse(JaxrsProxyLoaderImpl.java:93)

at org.jboss.errai.enterprise.client.jaxrs.AbstractJaxrsProxy$1.onResponseReceived(AbstractJaxrsProxy.java:129)

at com.google.gwt.http.client.Request.fireOnRespo

1. Re: NPE in JAX-RS marshaling with Errail 2.4.1

csa Oct 14, 2013 11:17 AM (in response to hr.stoyanov)

Hi Hristo,

Do you have the errai-jaxrs-provider.jar deployed to your server (it's a jaxrs provider that ensures your server is producing Errai's JSON format)?

If you prefer to use a Jackson generated JSON format then you don't need to deploy the errai-jaxrs-provider but you need to configure the client to expect the Jackson format:
http://docs.jboss.org/errai/2.4.1.Final/errai/reference/html_single/#sid-19398997_ErraiJAX-RS-EnablingJacksonmarshalling

Cheers,
Christian
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2. Re: NPE in JAX-RS marshaling with Errail 2.4.1

hr.stoyanov Oct 14, 2013 12:58 PM (in response to csa)

Thanks Christian!
We just figured out this to be the issue. We previous had:
a. erraiJaxRsJacksonMarshallingActive=true
b. we included errai-jaxrs-provider-2.4.1.Final.jar

The only thing that worked was when we removed a. and included b. in the WAR.
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3. Re: NPE in JAX-RS marshaling with Errail 2.4.1

csa Oct 14, 2013 8:24 PM (in response to hr.stoyanov)

OK, great! In order for a) to work (if you ever wanted to) you will need to make sure your server is returning JSON generated by Jackson. When using RestEasy you need to deploy the resteasy-jackson-provider. By default it will use Jettison to generate JSON.

Cheers,
Christian
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