ognl.OgnlException: target is null for setProperty(null, "emailTypeNo", [Ljava.lang.String;@1513fd0)
[com.opensymphony.xwork2.ognl.OgnlValueStack] - Error setting expression 'emaiTypeDto.emailTypeNo' with value '[Ljava.lang.String;@1513fd0' ognl.OgnlException: target is null for setProperty(null, "emailTypeNo", [Ljava.lang.String;@1513fd0) at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2309) 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:217) at com.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:186) at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:173) at com.opensymphony.xwork2.ognl.OgnlValueStack.setParameter(OgnlValueStack.java:151) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:317) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:228) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:236) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:192) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at com.manage.common.interceptor.LoginedCheckInterceptor.intercept(LoginedCheckInterceptor.java:50) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:511) 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:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:185) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:151) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:269) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1773) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)
这种情况是在struts2高级的POJO访问时候出现的s
警告: Error setting expression 'user.password' with value '[Ljava.lang.String;@1cb2dd1' ognl.OgnlException: target is null for setProperty(null, "password", [Ljava.lang.String;@1cb2dd1) at ognl.OgnlRuntime.setProperty(OgnlRuntime.Java:2219)
跟上面差不多的异常，我刚开始也遇到这个比较纠结的问题，下面我来说说我是如何解决的吧，可能大家遇到的跟我的不一样。但是这中间有几个地方需要注意，不然就会出现上面的错。
1、前台jsp
- <body>
- <form action="<%= path%>/login.action" method="post">
- 用户名:<input type = "text" name = "user.username"><br/>
- 密 码:<input type = "text" name = "user.password"><br/>
- <input type = "submit" value = "login">
- </form>
- </body>
注意两个地方，一个是input里面的name要写成**.XX；这里的**就是你后面action中的一个类对象，小写就OK，我这里是一个user,还有就是这里是name=不是id=，如果是用id的话，好像是传不到action中去的。
2、action类
- public class Login extends ActionSupport {
- public User getUser() {
- return user;
- }
- public void setUser(User user) {
- this.user = user;
- }
- private User user = new User();
- @Override
- public String execute() throws Exception {
- System.out.println("username="+user.getUsername()+",password="+user.getPassword());
- return SUCCESS;
- }
- }
user类
- public class User {
- private String username;
- private String password;
- public String getUsername() {
- return username;
- }
- public void setUsername(String username) {
- this.username = username;
- }
- public String getPassword() {
- return password;
- }
- public void setPassword(String password) {
- this.password = password;
- }
- }
action中的 user类必须得new，如果不new会报空指针(除非你已经配好spring，让spring给你做这件事)
再一个就是必须得有get/set方法，user的get/set方法。
struts.xm;
- <package name="login" extends="struts-default">
- <action name="login" class="com.ssh2.action.Login">
- <result name="success" type="redirect">/index.jsp</result>
- <result name="error" type = "redirect">/login.jsp</result>
- </action>
- </package>
注意上面几点就没问题了。
我的问题出现的原因是：请求的action错误了，所以出现了这个问题。
