（转）target is null for setProperty(null, "submit",
2010-11-29 14:10:43 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
警告: Error setting expression 'label.submit' with value '[Ljava.lang.String;@c70b0d'
ognl.OgnlException: target is null for setProperty(null, "submit", [Ljava.lang.String;@c70b0d)
?at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2239)
?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:209)
?at com.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:173)
?at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:160)
?at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:151)
?at com.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:288)
?at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:199)
?at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
?at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
?at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
?at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
?at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
?at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
?at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)
?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
?at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:102)
?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:230)
?at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
?at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
?at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
?at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
?at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
?at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
?at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
?at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
?at java.lang.Thread.run(Thread.java:662)
解决方法
<s:submit key=”label.submit” /> 作用为：当点击这个按钮时，将sername和password两个文本内容保存到数据库里
出错信息如下：
ognl.OgnlException: target is null for setProperty(null, "submit", [Ljava.lang.String;@c70b0d)
出错信息已经很明白地说了insert的Set属性值为NULL。整个代码中除了key=”label.submit” ，其它地方没有submit了啊，这是用来对submit进行定义id和name的，并且会把资源文件的label.submit的值作为其value显示出来。
我想起Struts2并不是从Struts1过来的，而是xwork，会不会是button.insert的写法上有问题，我把 . 改为 _ ，再执行，通过。<s:submit key=”label_submit” />
看来Struts2的资源文件还是要慎用 点(.)作分隔符。
