Hi devs, I got the following exception when I make a GET to a simple REST service which I tested before and worked fine for me.
Aug 12, 2011 11:51:58 AM org.apache.wink.server.internal.RequestProcessor handleRequest SEVERE: An unhandled exception occurred which will be propagated to the container. java.lang.NullPointerException at org.apache.wink.common.internal.http.Accept.valueOf(Accept.java:139) at org.apache.wink.server.internal.contexts.HttpHeadersImpl.getAcceptHeader(HttpHeadersImpl.java:151) at org.apache.wink.server.internal.contexts.HttpHeadersImpl.getAcceptableMediaTypes(HttpHeadersImpl.java:105) at org.apache.wink.server.internal.registry.ResourceRegistry.filterByProduces(ResourceRegistry.java:558) at org.apache.wink.server.internal.registry.ResourceRegistry.filterDispatchMethods(ResourceRegistry.java:482) at org.apache.wink.server.internal.registry.ResourceRegistry.findSubResourceMethod(ResourceRegistry.java:391) at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleSubResourceMethod(FindResourceMethodHandler.java:169) at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleRequest(FindResourceMethodHandler.java:110) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.handlers.FindRootResourceHandler.handleRequest(FindRootResourceHandler.java:95) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.handlers.HeadMethodHandler.handleRequest(HeadMethodHandler.java:53) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.handlers.OptionsMethodHandler.handleRequest(OptionsMethodHandler.java:46) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.handlers.SearchResultHandler.handleRequest(SearchResultHandler.java:33) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.log.ResourceInvocation.handleRequest(ResourceInvocation.java:92) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.log.Requests.handleRequest(Requests.java:76) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.handlers.AbstractHandlersChain.run(AbstractHandlersChain.java:48) at org.apache.wink.server.internal.RequestProcessor.handleRequestWithoutFaultBarrier(RequestProcessor.java:207) at org.apache.wink.server.internal.RequestProcessor.handleRequest(RequestProcessor.java:154) at org.apache.wink.server.internal.servlet.RestServlet.service(RestServlet.java:119) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:389) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.apache.tuscany.sca.core.work.impl.Work.run(Work.java:63) at org.apache.tuscany.sca.core.work.impl.ThreadPoolWorkManager$DecoratingWork.run(ThreadPoolWorkManager.java:214) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) Aug 12, 2011 11:51:58 AM org.apache.tuscany.sca.http.jetty.JettyLogger warn WARNING: /HelloWorldComponent/HelloWorld/sayHello java.lang.NullPointerException at org.apache.wink.common.internal.http.Accept.valueOf(Accept.java:139) at org.apache.wink.server.internal.contexts.HttpHeadersImpl.getAcceptHeader(HttpHeadersImpl.java:151) at org.apache.wink.server.internal.contexts.HttpHeadersImpl.getAcceptableMediaTypes(HttpHeadersImpl.java:105) at org.apache.wink.server.internal.registry.ResourceRegistry.filterByProduces(ResourceRegistry.java:558) at org.apache.wink.server.internal.registry.ResourceRegistry.filterDispatchMethods(ResourceRegistry.java:482) at org.apache.wink.server.internal.registry.ResourceRegistry.findSubResourceMethod(ResourceRegistry.java:391) at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleSubResourceMethod(FindResourceMethodHandler.java:169) at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleRequest(FindResourceMethodHandler.java:110) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.handlers.FindRootResourceHandler.handleRequest(FindRootResourceHandler.java:95) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.handlers.HeadMethodHandler.handleRequest(HeadMethodHandler.java:53) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.handlers.OptionsMethodHandler.handleRequest(OptionsMethodHandler.java:46) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.handlers.SearchResultHandler.handleRequest(SearchResultHandler.java:33) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.log.ResourceInvocation.handleRequest(ResourceInvocation.java:92) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.internal.log.Requests.handleRequest(Requests.java:76) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26) at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22) at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63) at org.apache.wink.server.handlers.AbstractHandlersChain.run(AbstractHandlersChain.java:48) at org.apache.wink.server.internal.RequestProcessor.handleRequestWithoutFaultBarrier(RequestProcessor.java:207) at org.apache.wink.server.internal.RequestProcessor.handleRequest(RequestProcessor.java:154) at org.apache.wink.server.internal.servlet.RestServlet.service(RestServlet.java:119) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:389) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.apache.tuscany.sca.core.work.impl.Work.run(Work.java:63) at org.apache.tuscany.sca.core.work.impl.ThreadPoolWorkManager$DecoratingWork.run(ThreadPoolWorkManager.java:214) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) What can be the reason for this? thanks