[infinispan-dev] NPE in MapReduceTask running in cluster

NPE ocures while running CapeDwarf cluster tests, see stack below. Null comes from MapReduceTask.invokeEverywhere 13:36:51,053 INFO [org.jboss.as.clustering.infinispan] (http-/192.168.30.248:8080-1) JBAS010281: Started search_capedwarf-test cache from capedwarf container 13:36:51,058 DEBUG [org.infinispan.distexec.mapreduce.MapReduceTask] (http-/192.168.30.248:8080-1) Invoking MapCombineCommand [keys=[], taskId=14c75f18-3861-4a06-8a4a-b1592d542d14] across entire cluster *13:36:51,065 DEBUG [org.infinispan.distexec.mapreduce.MapReduceTask] (http-/192.168.30.248:8080-1) Invoked MapCombineCommand [keys=[], taskId=14c75f18-3861-4a06-8a4a-b1592d542d14] across entire cluster, results are {node-b/capedwarf=null}* 13:36:51,067 DEBUG [org.infinispan.distexec.mapreduce.MapReduceTask] (http-/192.168.30.248:8080-1) Invoking MapCombineCommand [keys=[], taskId=14c75f18-3861-4a06-8a4a-b1592d542d14] locally 13:36:51,069 DEBUG [org.infinispan.distexec.mapreduce.MapReduceTask] (http-/192.168.30.248:8080-1) Invoked MapCombineCommand [keys=[], taskId=14c75f18-3861-4a06-8a4a-b1592d542d14] locally Any idea ? Thanks, Matej. java.lang.NullPointerException at org.infinispan.distexec.mapreduce.MapReduceTask.mergeResponse(MapReduceTask.java:530) at org.infinispan.distexec.mapreduce.MapReduceTask.executeMapPhaseWithLocalReduction(MapReduceTask.java:439) at org.infinispan.distexec.mapreduce.MapReduceTask.execute(MapReduceTask.java:328) at org.infinispan.distexec.mapreduce.MapReduceTask.execute(MapReduceTask.java:692) at org.jboss.capedwarf.search.CapedwarfSearchService.listIndexes(CapedwarfSearchService.java:94) at org.jboss.test.capedwarf.cluster.SearchTestCase.clear(SearchTestCase.java:360) at org.jboss.test.capedwarf.cluster.SearchTestCase.cleanpOnStart(SearchTestCase.java:51) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.jboss.arquillian.junit.Arquillian$6$1.invoke(Arquillian.java:270) at org.jboss.arquillian.container.test.impl.execution.LocalTestExecuter.execute(LocalTestExecuter.java:60) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:135) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:115) at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:67) at org.jboss.arquillian.container.test.impl.execution.ContainerTestExecuter.execute(ContainerTestExecuter.java:38) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) at org.jboss.arquillian.test.impl.TestContextHandler.createTestContext(TestContextHandler.java:89) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createClassContext(TestContextHandler.java:75) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:60) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:135) at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:111) at org.jboss.arquillian.junit.Arquillian$6.evaluate(Arquillian.java:263) at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:226) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314) at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46) at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:240) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:185) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314) at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46) at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:199) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:147) at org.junit.runner.JUnitCore.run(JUnitCore.java:157) at org.junit.runner.JUnitCore.run(JUnitCore.java:136) at org.jboss.arquillian.junit.container.JUnitTestRunner.execute(JUnitTestRunner.java:65) at org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.executeTest(ServletTestRunner.java:160) at org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.execute(ServletTestRunner.java:126) at org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.doGet(ServletTestRunner.java:90) at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) at org.jboss.capedwarf.appidentity.GAEFilter.doFilter(GAEFilter.java:57) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) at org.jboss.modcluster.container.jbossweb.JBossWebContext$RequestListenerValve.event(JBossWebContext.java:67) at org.jboss.modcluster.container.jbossweb.JBossWebContext$RequestListenerValve.invoke(JBossWebContext.java:48) at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:165) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:372) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:679) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:931) at java.lang.Thread.run(Thread.java:722)