[Resteasy-users] RESTEasy Client in OSGi Environment

[Rohrberg, T. <tim...@vi...>]

Hello everybody,

I am currently trying to use the RESTEasy client framework within an OSGi environment (Eclipse Equinox). To provide the required dependencies, I created a separate Eclipse Plug-In containing the required JAR libraries and exporting the contained packages to downstream bundles. Then, I am using the RESTEasy client framework as follows within my main bundle which includes the before mentioned bundle as required bundle:

ResteasyClient client = new ResteasyClientBuilder().build();
ResteasyWebTarget target = client
.target( "http://192.168.100.181:5952/RXT_RESTWebService-2.1/jobtemplates/Vitaphone 300 BT/386340" );
RxtDevice device = target.request().get( RxtDevice.class );
System.out.println( device.getId() );

Unfortunately, I always get the following error:

javax.ws.rs.client.ResponseProcessingException: javax.ws.rs.ProcessingException: Unable to find a MessageBodyReader of content-type application/xml and type class com.vitasystems.remosxt.rest.client.model.RxtDevice
      at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.extractResult(ClientInvocation.java:140)
      at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.invoke(ClientInvocation.java:444)
      at org.jboss.resteasy.client.jaxrs.internal.ClientInvocationBuilder.get(ClientInvocationBuilder.java:165)
      at de.vitasystems.example.resteasy.client.Activator.start(Activator.java:25)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
      at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
      at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:390)
      at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1176)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:559)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:544)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:457)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:438)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:1)
      at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
      at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
Caused by: javax.ws.rs.ProcessingException: Unable to find a MessageBodyReader of content-type application/xml and type class com.vitasystems.remosxt.rest.client.model.RxtDevice
      at org.jboss.resteasy.core.interception.ClientReaderInterceptorContext.throwReaderNotFound(ClientReaderInterceptorContext.java:39)
      at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.getReader(AbstractReaderInterceptorContext.java:73)
      at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:50)
      at org.jboss.resteasy.plugins.interceptors.encoding.GZIPDecodingInterceptor.aroundReadFrom(GZIPDecodingInterceptor.java:59)
      at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:53)
      at org.jboss.resteasy.client.jaxrs.internal.ClientResponse.readFrom(ClientResponse.java:245)
      at org.jboss.resteasy.client.jaxrs.internal.ClientResponse.readEntity(ClientResponse.java:179)
      at org.jboss.resteasy.specimpl.BuiltResponse.readEntity(BuiltResponse.java:211)
      at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.extractResult(ClientInvocation.java:104)
      ... 18 more

By debugging the included libraries, I tracked the problem down to the following location:

ResteasyProviderFactory.java

protected <T> MessageBodyReader<T> resolveMessageBodyReader(Class<T> type, Type genericType, Annotation[] annotations, MediaType mediaType, MediaTypeMap<SortedKey<MessageBodyReader>> availableReaders)
{
List<SortedKey<MessageBodyReader>> readers = availableReaders.getPossible(mediaType, type);

//logger.info("******** getMessageBodyReader *******");
for (SortedKey<MessageBodyReader> reader : readers)
{
//logger.info("     matching reader: " + reader.getClass().getName());
if (reader.obj.isReadable(type, genericType, annotations, mediaType))
{
return (MessageBodyReader<T>) reader.obj;
}
}
return null;
}

The problem is a little weired: The readers list of MessageBodyReader instances contains the org.jboss.resteasy.plugins.providers.jaxb.JAXBXmlRootElementProvider, but the reader.obj.isReadable() method returns false for that reader.

In another setup as a plain Maven project outside of the OSGi world, the the referred method reader.obj.isReadable() returns true and the same piece of code works.

I am at the end of my knowledge... Do you guys have any hints?

Best regards,
Timo Rohrberg

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