axis2异常

[INFO] The 易做图-service.aar service, which is not valid, caused java.lang.NullPointerException
at org.apache.axis2.engine.Phase.insertHandler(Phase.java:205)
at org.apache.axis2.engine.Phase.addHandler(Phase.java:150)
at org.apache.axis2.phaseresolver.PhaseHolder.addHandler(PhaseHolder.java:73)
at org.apache.axis2.phaseresolver.PhaseResolver.engageModuleToFlow(PhaseResolver.java:68)
at org.apache.axis2.phaseresolver.PhaseResolver.engageModuleToOperation(PhaseResolver.java:104)
at org.apache.axis2.phaseresolver.PhaseResolver.engageModuleToOperation(PhaseResolver.java:110)
at org.apache.axis2.description.AxisOperation.onEngage(AxisOperation.java:152)
at org.apache.axis2.description.AxisDescription.engageModule(AxisDescription.java:470)
at org.apache.axis2.description.AxisService.onEngage(AxisService.java:752)
at org.apache.axis2.description.AxisDescription.engageModule(AxisDescription.java:470)
at org.apache.axis2.description.AxisDescription.engageModule(AxisDescription.java:433)
at org.apache.axis2.deployment.DeploymentEngine.fillServiceGroup(DeploymentEngine.java:618)
at org.apache.axis2.deployment.DeploymentEngine.addServiceGroup(DeploymentEngine.java:565)
at org.apache.axis2.deployment.ServiceDeployer.deploy(ServiceDeployer.java:86)
at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:663)
at org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:144)
at org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:338)
at org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:241)
at org.apache.axis2.deployment.DeploymentEngine.loadServices(DeploymentEngine.java:131)
at org.apache.axis2.deployment.WarBasedAxisConfigurator.loadServices(WarBasedAxisConfigurator.java:284)
at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContext(ConfigurationContextFactory.java:95)
at org.apache.axis2.transport.http.AxisServlet.initConfigContext(AxisServlet.java:525)
at org.apache.axis2.transport.http.AxisServlet.init(AxisServlet.java:443)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1172)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:992)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4058)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4371)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:830)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:719)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:490)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1149)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

--------------------编程问答-------------------- extends AbstractHandler implements Handler 这个有什么用

如果单独implements Handler 这个和上面的有什么区别？

补充：Java ,  Web 开发