MapReduceTaskLifecycleService shouldn't keep the list of found lifecycle implementations ---------------------------------------------------------------------------------------- Key: ISPN-4334 URL: https://issues.jboss.org/browse/ISPN-4334 Project: Infinispan Issue Type: Bug Components: Distributed Execution and Map/Reduce, Remote Querying Reporter: Jakub Markos The issue is that this class https://github.com/infinispan/infinispan/blob/master/core/src/main/java/o... searches for the lifecycle classes using current threads classloader, and then caches the result, so the returned list of implementations depends only on the 1st thread creating the singleton instance of the service. You can replicate the bug from this branch: https://github.com/jmarkos/infinispan/tree/queries running {code} mvn clean verify -Dmaven.test.failure.ignore=true -DfailIfNoTests=false -U -Psuite.others -Dtest=RemoteQueryKeySetTest,ManualIndexingTest {code} from the server/integration/testsuite directory, results in an exception: {code}javax.management.MBeanException at org.infinispan.jmx.ResourceDMBean.invoke(ResourceDMBean.java:271) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:791) at org.jboss.as.jmx.PluggableMBeanServerImpl$TcclMBeanServer.invoke(PluggableMBeanServerImpl.java:527) at org.jboss.as.jmx.PluggableMBeanServerImpl.invoke(PluggableMBeanServerImpl.java:263) at org.jboss.remotingjmx.protocol.v2.ServerProxy$InvokeHandler.handle(ServerProxy.java:915) at org.jboss.remotingjmx.protocol.v2.ServerCommon$MessageReciever$1.run(ServerCommon.java:152) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722) Caused by: java.lang.reflect.InvocationTargetException 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.infinispan.jmx.ResourceDMBean.invoke(ResourceDMBean.java:269) ... 9 more Caused by: org.infinispan.commons.CacheException: java.util.concurrent.ExecutionException: java.lang.NullPointerException at org.infinispan.distexec.mapreduce.MapReduceTask.executeHelper(MapReduceTask.java:517) at org.infinispan.distexec.mapreduce.MapReduceTask.execute(MapReduceTask.java:427) at org.infinispan.query.impl.massindex.MapReduceMassIndexer.start(MapReduceMassIndexer.java:25) ... 14 more Caused by: java.util.concurrent.ExecutionException: java.lang.NullPointerException at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252) at java.util.concurrent.FutureTask.get(FutureTask.java:111) at org.infinispan.distexec.mapreduce.MapReduceTask$TaskPart.get(MapReduceTask.java:1059) at org.infinispan.distexec.mapreduce.MapReduceTask.executeMapPhaseWithLocalReduction(MapReduceTask.java:677) at org.infinispan.distexec.mapreduce.MapReduceTask.executeHelper(MapReduceTask.java:510) ... 16 more Caused by: java.lang.NullPointerException at org.infinispan.query.impl.massindex.IndexingMapper.map(IndexingMapper.java:38) at org.infinispan.distexec.mapreduce.MapReduceManagerImpl$2.apply(MapReduceManagerImpl.java:207) at org.infinispan.distexec.mapreduce.MapReduceManagerImpl$2.apply(MapReduceManagerImpl.java:202) at org.infinispan.container.DefaultDataContainer$1.apply(DefaultDataContainer.java:393) at org.infinispan.container.DefaultDataContainer$1.apply(DefaultDataContainer.java:389) at org.infinispan.commons.util.concurrent.jdk8backported.ConcurrentParallelHashMapV8$1.apply(ConcurrentParallelHashMapV8.java:48) at org.infinispan.commons.util.concurrent.jdk8backported.EquivalentConcurrentHashMapV8$ForEachMappingTask.compute(EquivalentConcurrentHashMapV8.java:4894) at org.infinispan.commons.util.concurrent.jdk8backported.CountedCompleter.exec(CountedCompleter.java:681) at org.infinispan.commons.util.concurrent.jdk8backported.ForkJoinTask.doExec(ForkJoinTask.java:264) at org.infinispan.commons.util.concurrent.jdk8backported.ForkJoinTask.doInvoke(ForkJoinTask.java:360) at org.infinispan.commons.util.concurrent.jdk8backported.ForkJoinTask.invoke(ForkJoinTask.java:692) at org.infinispan.commons.util.concurrent.jdk8backported.EquivalentConcurrentHashMapV8.forEach(EquivalentConcurrentHashMapV8.java:3592) at org.infinispan.commons.util.concurrent.jdk8backported.ConcurrentParallelHashMapV8.forEach(ConcurrentParallelHashMapV8.java:44) at org.infinispan.container.DefaultDataContainer.executeTask(DefaultDataContainer.java:389) at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.map(MapReduceManagerImpl.java:202) at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.mapAndCombineForLocalReduction(MapReduceManagerImpl.java:87) at org.infinispan.distexec.mapreduce.MapReduceTask$MapTaskPart.invokeMapCombineLocallyForLocalReduction(MapReduceTask.java:1173) at org.infinispan.distexec.mapreduce.MapReduceTask$MapTaskPart.access$300(MapReduceTask.java:1112) at org.infinispan.distexec.mapreduce.MapReduceTask$MapTaskPart$2.call(MapReduceTask.java:1144) at org.infinispan.distexec.mapreduce.MapReduceTask$MapTaskPart$2.call(MapReduceTask.java:1140) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) 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:722) at org.jboss.threads.JBossThread.run(JBossThread.java:122) {code} If you instead use -Dtest=RemoteQueryKeySetTest,ManualIndexingggggggggggggTest (to change the order of the execution, junit probably orders it by length), it passes, because MapReduceTaskLifecycleService is created from a thread which classloader sees the query module and therefore can load this class https://github.com/infinispan/infinispan/blob/master/query/src/main/java/... which properly initializes IndexingMapper and avoids the NPE. Thanks to Adrian Nistor for his help.