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java.lang.NullPointerException: 	at org.apache.cxf.common.util.Compiler.useJava6Compiler(Compiler.java:187)	at org.apache.cxf.common.util.Compiler.compileFiles(Compiler.java:141)	at org.apache.cxf.common.util.Compiler.compileFiles(Compiler.java:136)	at org.apache.cxf.endpoint.dynamic.DynamicClientFactory.compileJavaSrc(DynamicClientFactory.java:610)	at org.apache.cxf.endpoint.dynamic.DynamicClientFactory.createClient(DynamicClientFactory.java:369)	at org.apache.cxf.endpoint.dynamic.DynamicClientFactory.createClient(DynamicClientFactory.java:240)	at org.jbpm.process.workitem.webservice.WebServiceWorkItemHandler.getWSClient(WebServiceWorkItemHandler.java:201)	at org.jbpm.process.workitem.webservice.WebServiceWorkItemHandler.executeWorkItem(WebServiceWorkItemHandler.java:105)	at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:69)	at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:138)	at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:173)	at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:366)	at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:325)	at org.jbpm.workflow.instance.node.ActionNodeInstance.triggerCompleted(ActionNodeInstance.java:61)	at org.jbpm.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:57)	at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:173)	at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:366)	at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:325)	at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:73)	at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:44)	at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:173)	at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35)	at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:236)	at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:439)	at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:208)	at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:217)	at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:225)	at org.drools.core.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:1812)	at org.drools.core.command.runtime.process.StartCorrelatedProcessCommand.execute(StartCorrelatedProcessCommand.java:146)	at org.drools.core.command.runtime.process.StartCorrelatedProcessCommand.execute(StartCorrelatedProcessCommand.java:44)	at org.drools.core.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)	at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:41)	at org.drools.persistence.SingleSessionCommandService$TransactionInterceptor.execute(SingleSessionCommandService.java:584)	at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:41)	at org.drools.persistence.jpa.OptimisticLockRetryInterceptor.execute(OptimisticLockRetryInterceptor.java:82)	at org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:41)	at org.drools.persistence.jta.TransactionLockInterceptor.execute(TransactionLockInterceptor.java:73)	at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:377)	at org.drools.core.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:529)	at org.jbpm.kie.services.impl.ProcessServiceImpl.startProcess(ProcessServiceImpl.java:126)	at org.jbpm.services.cdi.impl.ProcessServiceCDIImpl$Proxy$_$$_WeldClientProxy.startProcess(ProcessServiceCDIImpl$Proxy$_$$_WeldClientProxy.java)	at org.jbpm.console.ng.bd.backend.server.KieSessionEntryPointImpl.startProcess(KieSessionEntryPointImpl.java:78)	at org.jbpm.console.ng.bd.backend.server.KieSessionEntryPointImpl$Proxy$_$$_WeldClientProxy.startProcess(KieSessionEntryPointImpl$Proxy$_$$_WeldClientProxy.java)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.jboss.errai.bus.server.io.AbstractRPCMethodCallback.invokeMethodFromMessage(AbstractRPCMethodCallback.java:48)	at org.jboss.errai.bus.server.io.ValueReplyRPCEndpointCallback.callback(ValueReplyRPCEndpointCallback.java:22)	at org.jboss.errai.bus.server.io.RemoteServiceCallback.callback(RemoteServiceCallback.java:54)	at org.jboss.errai.cdi.server.CDIExtensionPoints$2.callback(CDIExtensionPoints.java:396)	at org.jboss.errai.bus.server.DeliveryPlan.deliver(DeliveryPlan.java:47)	at org.jboss.errai.bus.server.ServerMessageBusImpl.sendGlobal(ServerMessageBusImpl.java:296)	at org.jboss.errai.bus.server.SimpleDispatcher.dispatchGlobal(SimpleDispatcher.java:46)	at org.jboss.errai.bus.server.service.ErraiServiceImpl.store(ErraiServiceImpl.java:97)	at org.jboss.errai.bus.server.service.ErraiServiceImpl.store(ErraiServiceImpl.java:114)	at org.jboss.errai.bus.server.servlet.DefaultBlockingServlet.doPost(DefaultBlockingServlet.java:142)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.uberfire.ext.security.server.SecureHeadersFilter.doFilter(SecureHeadersFilter.java:53)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.uberfire.ext.security.server.SecurityIntegrationFilter.doFilter(SecurityIntegrationFilter.java:45)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)	at org.kie.integration.tomcat.JACCValve.invoke(JACCValve.java:101)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2516)	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2505)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Unknown Source)