Re: Rest ws: how to return an empty List avoiding java.lang.IndexOutOfBoundsException

Fri, 17 May 2013 03:35:59 -0700 

Hi
Please see comments below,
On 17/05/13 11:04, eanbiso wrote:

Hi all,
I have a problem with rest endPoint that return an empty list.
I have a ws interface like this:

     @GET
     @Produces("multipart/form-data;type=text/xml")
     @Path("/GetNetworkIDsManagedBy/{controller}")
     public List<Integer> GetNetworkIDsManagedBy(
                        @PathParam("controller") int controller);

If in the implementor I return an empty list:

     @Override
     public List<Integer> GetNetworkIDsManagedBy(int controller) {
         List<Integer> temp = new ArrayList<Integer>();
         return temp;
     }


this exception occurs:

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.RangeCheck(Unknown Source)
        at java.util.ArrayList.get(Unknown Source)
        at
org.apache.cxf.jaxrs.ext.MessageContextImpl.convertToAttachments(MessageContextImpl.java:185)
        at
org.apache.cxf.jaxrs.ext.MessageContextImpl.put(MessageContextImpl.java:159)
        at
org.apache.cxf.jaxrs.impl.tl.ThreadLocalMessageContext.put(ThreadLocalMessageContext.java:83)
        at
org.apache.cxf.jaxrs.provider.MultipartProvider.writeTo(MultipartProvider.java:245)
        at
org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor.serializeMessage(JAXRSOutInterceptor.java:257)
        at
org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor.processResponse(JAXRSOutInterceptor.java:144)
        at
org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor.handleMessage(JAXRSOutInterceptor.java:83)
        at
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)
        at
org.apache.cxf.interceptor.OutgoingChainInterceptor.handleMessage(OutgoingChainInterceptor.java:77)
        at
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)
        at
org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:123)
        at
org.apache.cxf.transport.http_jetty.JettyHTTPDestination.serviceRequest(JettyHTTPDestination.java:323)
        at
org.apache.cxf.transport.http_jetty.JettyHTTPDestination.doService(JettyHTTPDestination.java:289)
        at
org.apache.cxf.transport.http_jetty.JettyHTTPHandler.handle(JettyHTTPHandler.java:72)
        at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:942)
        at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:878)
        at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
        at
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
        at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
        at org.eclipse.jetty.server.Server.handle(Server.java:349)
        at
org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441)
        at
org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:919)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:582)
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:218)
        at
org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:52)
        at
org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:586)
        at
org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:44)
        at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598)
        at
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)
        at java.lang.Thread.run(Unknown Source)


However, if I return null instead of the empty list, no exception occurs and
the client receive the response.
In this case it has to be an empty body and HTTP status 204 - is what the client is seeing when you return null. 


I'd like to get the same behavior, returning an empty list.
Is it possible and how?
Do I use wrong annotations?


What exactly do you expect when you return an empty List<Integer> ?
Empty body & 204 ? Or actually a proper multipart/form-data payload response with the root part containing some XML ?
FYI, JAXB provider will not handle List<Integer>, you will need to wrap it into a bean or if you prefer returning List - then wrap Integer into a bean 

Cheers, Sergey



Thanks a lot,

Andrea




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