target is null for setProperty(null, "passwordHash", [Ljava.lang.String;@1535ac)

2013-03-12 17:06:34 [http-8080-2]-[com.opensymphony.xwork2.ognl.OgnlValueStack]-[WARN] : Error setting expression 'user.passwordHash' with value '[Ljava.lang.String;@1535ac'

ognl.OgnlException: target is null for setProperty(null, "passwordHash", [Ljava.lang.String;@1535ac)

 at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2219)

 at ognl.ASTProperty.setValueBody(ASTProperty.java:127)

 at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220)

 at ognl.SimpleNode.setValue(SimpleNode.java:301)

 at ognl.ASTChain.setValueBody(ASTChain.java:227)

 at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220)

 at ognl.SimpleNode.setValue(SimpleNode.java:301)

 at ognl.Ognl.setValue(Ognl.java:737)

 at com.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:198)

 at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:161)

 at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:149)

 at com.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:276)

 at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:187)

 at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)

 at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)

 at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)

 at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)

 at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)

 at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)

 at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)

 at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

 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:293)

 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)

 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)

 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)

 

 

 

解决的方法

struts.xml文件里面有这么一个"struts.devMode"。当设为true时，html表单数据中有和action属性匹配不上的参数名时就会提示这样的信息。我试了一下，果然如此，因此在开发过程中将这个属性设为true还是不错的，可以帮我们发现一些可能出现的问题。

这个错误信息主要因为struts.devMode = true引起，因为使用struts在默认配置下对任何提交到action的参数强制需要setter方法，而我们在使用token的时候一般都没有正确的为每一个token设置该参数，为此提交的token信息就会在这里一起一些错误信息，如果需要屏蔽掉这些的话，可以设置webwork.devMode = false来避免这种错误信息的抛出，当然这些错误在程序调试的时候是有用处了，我们可以根据这些信息来删除不必要的参数

还有就是Struts2的资源文件还是要慎用 点(.)作分隔符。否则也会出现这个问题

 at java.lang.Thread.run(Thread.java:619)