axis2 Exception

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org.apache.axis2.AxisFault: com.itms.app.lessonmanager.vo.LessonCategory at org.apache.axis2.util.Utils.getInboundFaultFromMessageContext(Utils.java:435) at org.apache.axis2.description.OutInAxisOperationClient.handleResponse(OutInAxisOperation.java:371) at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:417) at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229) at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165) at com.itms.webservice.client.lessonmanage.LessonServiceStub.saveLessonCategory(LessonServiceStub.java:2426) at com.itms.webservice.client.lessonservice.LessonService.saveLessonCategory(LessonService.java:60) at com.itms.webservice.client.lessonservice.LessonServiceTest.testSaveLessonCategory(LessonServiceTest.java:24) 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.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99) at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81) at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75) at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45) at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66) at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35) at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42) at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

以上是单元测试下的异常，后台异常：

[ERROR] RPCMessageReceiver - Exception occurred while trying to invoke service method saveLessonCategory <org.apache.axi s2.AxisFault: com.itms.app.lessonmanager.vo.LessonCategory>org.apache.axis2.AxisFault: com.itms.app.lessonmanager.vo.Les sonCategory at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430) at org.apache.axis2.engine.DefaultObjectSupplier.getObject(DefaultObjectSupplier.java:45) at org.apache.axis2.databinding.utils.BeanUtil.deserialize(BeanUtil.java:368) at org.apache.axis2.databinding.utils.BeanUtil.processObject(BeanUtil.java:682) at org.apache.axis2.databinding.utils.BeanUtil.ProcessElement(BeanUtil.java:630) at org.apache.axis2.databinding.utils.BeanUtil.deserialize(BeanUtil.java:562) at org.apache.axis2.rpc.receivers.RPCUtil.processRequest(RPCUtil.java:153) at org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:188) at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:102) at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java :40) at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:114) at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:173) at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:167) at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:142) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 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:298) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:861) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1584) at java.lang.Thread.run(Thread.java:595) Caused by: java.lang.InstantiationException: com.itms.app.lessonmanager.vo.LessonCategory at java.lang.Class.newInstance0(Class.java:335) at java.lang.Class.newInstance(Class.java:303) at org.apache.axis2.engine.DefaultObjectSupplier.getObject(DefaultObjectSupplier.java:40) ... 26 more [ERROR] AxisEngine - com.itms.app.lessonmanager.vo.LessonCategory <org.apache.axis2.AxisFault: com.itms.app.lessonmanage r.vo.LessonCategory>org.apache.axis2.AxisFault: com.itms.app.lessonmanager.vo.LessonCategory at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430) at org.apache.axis2.engine.DefaultObjectSupplier.getObject(DefaultObjectSupplier.java:45) at org.apache.axis2.databinding.utils.BeanUtil.deserialize(BeanUtil.java:368) at org.apache.axis2.databinding.utils.BeanUtil.processObject(BeanUtil.java:682) at org.apache.axis2.databinding.utils.BeanUtil.ProcessElement(BeanUtil.java:630) at org.apache.axis2.databinding.utils.BeanUtil.deserialize(BeanUtil.java:562) at org.apache.axis2.rpc.receivers.RPCUtil.processRequest(RPCUtil.java:153) at org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:188) at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:102) at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java :40) at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:114) at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:173) at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:167) at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:142) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 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:298) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:861) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1584) at java.lang.Thread.run(Thread.java:595) Caused by: java.lang.InstantiationException: com.itms.app.lessonmanager.vo.LessonCategory at java.lang.Class.newInstance0(Class.java:335) at java.lang.Class.newInstance(Class.java:303) at org.apache.axis2.engine.DefaultObjectSupplier.getObject(DefaultObjectSupplier.java:40) ... 26 more

Caused by: java.lang.InstantiationException，这个异常，我早应该想到是因为bean无法进行实例化，我应该检查bean中的构造方法的，原因是bean没有默认的构造方法，导致无法实例化该bean.

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