webwork提交表单时的webwork Could not create and/or set value back on to object异常
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刚开始使用webwork的时候忽略了一个问题,在Action中没有对提交的表单对象进行实例化。例如提交一个叫UserForm的表单,它所对应的类为UserInfo表单时,在UserInfoAction中没有对UserInfo进行实例化操作就会报出如下异常:
[mywap] ERROR [tcpConnection-8080-0] InstantiatingNullHandler.nullPropertyValue(86) | Could not create and/or set value back on to object
java.lang.NullPointerException
at ognl.OgnlRuntime$ClassCache.get(OgnlRuntime.java:144)
at ognl.OgnlRuntime.getDeclaredMethods(OgnlRuntime.java:1188)
at ognl.OgnlRuntime.getSetMethod(OgnlRuntime.java:1270)
at ognl.OgnlRuntime.hasSetMethod(OgnlRuntime.java:1291)
at ognl.OgnlRuntime.hasSetProperty(OgnlRuntime.java:1307)
at com.opensymphony.xwork.util.OgnlUtil.getRealTarget(OgnlUtil.java:156)
at com.opensymphony.xwork.util.InstantiatingNullHandler.nullPropertyValue(InstantiatingNullHandler.java:68)
at ognl.ASTProperty.getValueBody(ASTProperty.java:98)
at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:171)
at ognl.SimpleNode.getValue(SimpleNode.java:193)
at ognl.ASTChain.setValueBody(ASTChain.java:168)
at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:180)
at ognl.SimpleNode.setValue(SimpleNode.java:230)
at ognl.Ognl.setValue(Ognl.java:476)
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.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:103)
at com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:96)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:246)
at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:164)
at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
at java.lang.Thread.run(Thread.java:595)
[mywap] ERROR [tcpConnection-8080-0] ServletDispatcher.serviceAction(281) | Could not execute action
java.lang.NullPointerException
at com.mywap.webwork.action.ColumninfoAction.save(Unknown Source)
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:585)
at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:300)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:166)
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:103)
at com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:96)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:246)
at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:164)
at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
at java.lang.Thread.run(Thread.java:595)
这种异常就是由于上述问题引起的,其实反过来想也很简单。怎么可能对一个为null的对象进行set和get操作呢,没有什么意义嘛。
因此我们需要在Action中new一个对象出来即:
UserInfo userInfo = new UserInfo();
这样在用userInfo进行set和get操作就有意义了
我们要做有意义的事情!!!!
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