TROUBLESHOOTING: Servelet Exception during P

1，现象：

运行时错误，后台出现空指针异常； 代码没有任何编译错误，operationbinding返回的result是null。

前台出现PPR错误，编号从1开始增加：

Servelet Exception during PPR, #1 Servelet Exception during PPR, #2 Servelet Exception during PPR, #3 ... Servelet Exception during PPR, #n

部分log信息如下：

后台：

<ActionListenerImpl><processAction> java.lang.NullPointerException javax.faces.el.EvaluationException: java.lang.NullPointerException at org.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:51) at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) at org.apache.myfaces.trinidad.component.UIXCommand.broadcast(UIXCommand.java:190) ...... at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201) at weblogic.work.ExecuteThread.run(ExecuteThread.java:173) Caused by: java.lang.NullPointerException at cn.com.rpt.bean.Login.doLogin(Login.java:67) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.el.parser.AstValue.invoke(AstValue.java:157) at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283) at org.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:46) ... 43 more <RegistrationConfigurator><handleError> Server Exception during PPR, #3 javax.servlet.ServletException: java.lang.NullPointerException at javax.faces.webapp.FacesServlet.service(FacesServlet.java:277) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300) ...... Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException at org.apache.myfaces.trinidad.component.MethodExpressionMethodBinding.invoke(MethodExpressionMethodBinding.java:51) at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) ...... ... 35 more Caused by: java.lang.NullPointerException at cn.com.rpt.bean.Login.doLogin(Login.java:67) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ...... ... 43 more

或者：

<2011-8-9 下午04时39分29秒 CST> <Error> <HTTP> <BEA-101020> <[ServletContext@31577370[app:NEUADFFRS module:NEUADFFRS-FRSUI-context-root path:/xxxx-context-root spec-version:2.5]] Servlet failed with Exception oracle.jbo.PersistenceException: JBO-26000: 加载定制项时出现一般性异常错误。 at oracle.jbo.mom.MOMParserMDS.parse(MOMParserMDS.java:252) at oracle.jbo.mom.MOMParserNonMDS.readAndParse(MOMParserNonMDS.java:71) at oracle.jbo.mom.DefinitionContextStandard.readAndParse(DefinitionContextStandard.java:237) at oracle.jbo.mom.DefinitionManager.loadDefElement(DefinitionManager.java:1170) at oracle.jbo.mom.DefinitionManager.loadLazyDefinitionObject(DefinitionManager.java:946) Truncated. see log file for complete stacktrace Caused By: oracle.mds.exception.MDSRuntimeException: MDS-00068: 找不到以下对象的类型定义: 名称空间 = http://xmlns.oracle.com/bc4j, 本地名称 = LABEL, 文件位置 = /cn/com/xx/vo/XxxVO.xml at oracle.mds.internal.model.parse.MDSNodeParser.findMMElement(MDSNodeParser.java:322) at oracle.mds.internal.model.parse.MDSNodeParser.createModelNode(MDSNodeParser.java:603) at oracle.mds.internal.model.parse.MDSNodeParser.startElement(MDSNodeParser.java:240) at oracle.mds.internal.parsefwk.TreeBuilder$Handler.startElement(TreeBuilder.java:298) at oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1328) Truncated. see log file for complete stacktrace >

前台界面：

java.lang.NullPointerException For more information, please see the server's error log for an entry beginning with: Server Exception during PPR, #3
2，解决方案

检查JDeveloper版本，我出现该情况的时候，使用的是JDeveloper 11.1.1.3.0，而同事用了JDeveloper 11.1.1.4.0，创建了VO对象等。
手去修改VO对象的版本号，11.1.1.59.23-->11.1.1.56.60，去除VO中错误代码。

重新运行，OK。

TROUBLESHOOTING: Servelet Exception during PPR, #1...#n