[ https://issues.apache.org/jira/browse/AXIS2-5775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16444009#comment-16444009 ] Thorsten Schöning commented on AXIS2-5775: ------------------------------------------ I think I've encountered the same problem today in version 1.6.2. Because that is very old, I plan to upgrade anyway and are unable to reproduce it currently, I don't think it's worth it to spent time looking into this more detailed. Nevertheless, I would like to document the problem here as well, just in case I need to have a further look in future. {CODE} 2018-04-19 11:48:33,874 ERROR de.am_soft.util.backend.client.ClBase.callImpl: Exception occurred during method invocation. java.lang.NullPointerException: null at org.apache.axis2.context.AbstractContext.needPropertyDifferences(AbstractContext.java:239) ~[axis2-kernel-1.6.2.jar:1.6.2] at org.apache.axis2.context.AbstractContext.setProperty(AbstractContext.java:202) ~[axis2-kernel-1.6.2.jar:1.6.2] at org.apache.axis2.transport.http.HTTPSender.handleResponse(HTTPSender.java:270) ~[axis2-transport-http-1.6.2.jar:na] at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:194) ~[axis2-transport-http-1.6.2.jar:na] at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:75) ~[axis2-transport-http-1.6.2.jar:na] at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:404) ~[axis2-transport-http-1.6.2.jar:na] at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:231) ~[axis2-transport-http-1.6.2.jar:na] at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:443) ~[axis2-kernel-1.6.2.jar:1.6.2] at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:406) ~[axis2-kernel-1.6.2.jar:1.6.2] at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229) ~[axis2-kernel-1.6.2.jar:1.6.2] at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165) ~[axis2-kernel-1.6.2.jar:1.6.2] at org.apache.axis2.client.ServiceClient.sendRobust(ServiceClient.java:475) ~[axis2-kernel-1.6.2.jar:1.6.2] at org.apache.axis2.client.ServiceClient.sendRobust(ServiceClient.java:456) ~[axis2-kernel-1.6.2.jar:1.6.2] at org.apache.axis2.rpc.client.RPCServiceClient.invokeRobust(RPCServiceClient.java:158) ~[axis2-adb-1.6.2.jar:1.6.2] at de.am_soft.util.backend.client.soap_dispatcher.ClSdImpl.dispatchImpl(ClSdImpl.java:437) ~[lib/:na] at de.am_soft.util.backend.client.soap_dispatcher.ClSdImpl.dispatch(ClSdImpl.java:488) ~[lib/:na] at de.am_soft.util.backend.client.ClBase.callImpl(ClBase.java:92) [lib/:na] at de.am_soft.util.backend.client.ClBase.callImpl(ClBase.java:115) [lib/:na] at de.am_soft.sm_mtg.comm.backend.BkPackets.process(BkPackets.java:36) [lib/:na] at de.am_soft.sm_mtg.d.processor.Worker.processIncoming(Worker.java:90) [lib/:na] at de.am_soft.sm_mtg.d.processor.Processor$1.call(Processor.java:220) [lib/:na] at de.am_soft.sm_mtg.d.processor.Processor$1.call(Processor.java:1) [lib/:na] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_161] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_161] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_161] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_161] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_161] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161] {CODE} The NPE happens at the following line: {CODE} ClusteringAgent clusteringAgent = cc.getAxisConfiguration().getClusteringAgent(); {CODE} http://grepcode.com/file/repo1.maven.org/maven2/org.apache.axis2/axis2-kernel/1.6.2/org/apache/axis2/context/AbstractContext.java/#239 The NPE seems to happen while preparing a new SOAP request and I'm pretty sure to not share clients: {CODE} RPCServiceClient serviceClient = new RPCServiceClient(); QName qname = new QName(this.uri, method); Object[] response = null; serviceClient.setOptions(this.getDefaultOptions(method)); this.initHttpConnectionManager(serviceClient.getServiceContext().getConfigurationContext()); if ((returnTypes == null) || (returnTypes.length == 0) || (returnTypes[0] == null)) { 437 serviceClient.invokeRobust(qname, args); } else { response = serviceClient.invokeBlocking(qname, args, returnTypes); } response = this.createNativeResponse(response); {CODE} at de.am_soft.util.backend.client.soap_dispatcher.ClSdImpl.dispatchImpl(ClSdImpl.java:437) ~[lib/:na] {CODE} private Options getDefaultOptions(String action) { Options retVal = new Options(); retVal.setAction(action); retVal.setTo(new EndpointReference(this.epr)); retVal.setCallTransportCleanup(true); retVal.setTimeOutInMilliSeconds(0); return retVal; } private void initHttpConnectionManager(ConfigurationContext cfgCtx) { MultiThreadedHttpConnectionManager connMgr = (MultiThreadedHttpConnectionManager) cfgCtx.getProperty(HTTPConstants.MULTITHREAD_HTTP_CONNECTION_MANAGER); if (connMgr == null) { connMgr = new MultiThreadedHttpConnectionManager(); cfgCtx.setProperty(HTTPConstants.MULTITHREAD_HTTP_CONNECTION_MANAGER, connMgr); } HttpConnectionManagerParams connMgrParams = connMgr.getParams(); connMgrParams.setMaxConnectionsPerHost(HostConfiguration.ANY_HOST_CONFIGURATION, 100); connMgrParams.setMaxTotalConnections(100); } {CODE} > upgrading from axis2 1.4 to 1.6.4 > --------------------------------- > > Key: AXIS2-5775 > URL: https://issues.apache.org/jira/browse/AXIS2-5775 > Project: Axis2 > Issue Type: Bug > Components: kernel > Affects Versions: 1.6.4 > Reporter: Rajesh > Priority: Major > > Hi All, > This is related to existing JIRA AXIS2-5774. > We are upgrading from axis2 1.4 to 1.6.4. We upgraded successfully and got response from provider with execute() method. > After 4 to 8 request , the service is throwing below error intemittently. > (Modified now) > Error: > ======================= > at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:423) > at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:406) > at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229) > at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165) > ========================= > So we added few logging to Kernel 1.6.4 and found that after few request Cleanup() method in the serviceclient is cleaning the AxisConfiguration,hence the following request getting failed with Null error. > Also we see changes in AxisCOnfiguration in 1.4 and 1.6.4 in Cleanup method(). > Is this the normal behaviour in axis2 1.6.4? -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: java-dev-unsubscribe@axis.apache.org For additional commands, e-mail: java-dev-help@axis.apache.org