最近WEBWORK2老报这个错，郁闷，本地测试都没这个问题

10:29:56,703 ERROR XWorkConverter[addConverterMapping]:364 - Problem loading properties for java.io.Serializable 
java.lang.NullPointerException 
at com.opensymphony.util.ClassLoaderUtil.getResource(ClassLoaderUtil.java:48) 
at com.opensymphony.util.FileManager.loadFile(FileManager.java:64) 
at com.opensymphony.xwork.util.XWorkConverter.addConverterMapping(XWorkConverter.java:340) 
at com.opensymphony.xwork.util.XWorkConverter.buildConverterMapping(XWorkConverter.java:391) 
at com.opensymphony.xwork.util.XWorkConverter.getConverter(XWorkConverter.java:229) 
at com.opensymphony.xwork.util.XWorkConverter.convertValue(XWorkConverter.java:127) 
at ognl.OgnlRuntime.getConvertedType(OgnlRuntime.java:493) 
at ognl.OgnlRuntime.getConvertedTypes(OgnlRuntime.java:511) 
at ognl.OgnlRuntime.getConvertedMethodAndArgs(OgnlRuntime.java:536) 
at ognl.OgnlRuntime.getAppropriateMethod(OgnlRuntime.java:586) 
at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:597) 
at ognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:761) 
at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:76) 
at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:132) 
at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:1459) 
at com.opensymphony.xwork.util.CompoundRootAccessor.setProperty(CompoundRootAccessor.java:45) 
at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:1459) 
at ognl.ASTProperty.setValueBody(ASTProperty.java:105) 
at ognl.SimpleNode.setValue(SimpleNode.java:215) 
at ognl.Ognl.setValue(Ognl.java:478) 
at com.opensymphony.xwork.util.OgnlUtil.setValue(OgnlUtil.java:189) 
at com.opensymphony.xwork.util.OgnlValueStack.setValue(OgnlValueStack.java:115) 
at com.opensymphony.xwork.util.OgnlValueStack.setValue(OgnlValueStack.java:99) 
at com.opensymphony.xwork.interceptor.ParametersInterceptor.before(ParametersInterceptor.java:71) 
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:34) 
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:164) 
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35) 
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:164) 
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35) 
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:164) 
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35) 
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:164) 
at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:116) 
at com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletDispatcher.java:272) 
at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:237) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) 
at fccs.framework.tools.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:19) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214) 
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152) 
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) 
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) 
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) 
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) 
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) 
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:296) 
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:372) 
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:694) 
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:626) 
at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:807) 
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:644) 
at java.lang.Thread.run(Thread.java:595) 是配置文件属性读取错误？这样怎么找错误啊，高人指教了