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

[java] view plain copy

<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>

ognl.OgnlException: target is null for setProperty(null, "emailTypeNo", [Ljava.lang.String;@1513fd0)-LMLPHP

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

[java] view plain copy

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

[c-sharp] view plain copy

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;

[java] view plain copy

<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。