HTTP Status 500 - Request processing failed; nested exception is java.lang.IllegalStateException - spring

Question

I am working on a Spring MVC application and have an issue with the validation. I need to create an user and it is a 2 step process(meaning 2 jsps with the same controller). The jsps have 2 different commandNames. So when I created the validator for the first model and initialize it, the first page loads fine. For testing, I am not using an if condition, but forwarding to next page. I get an error as the controller tries to load the validator with the current commandName object and it fails.
When I enter the url http://ip:port/data, the page loads as there is no validation, it is just initial load
When I try to submit the page without entering the firstName and submit, the method #RequestMapping(value = "/user") is called and the the next page 2 is supposed to be loaded. But the page 2 fails.
binder.getTarget() prints UserData the first time which is right
binder.getTarget() prints userinfo the 2nd time, when the next page is loading and it fails with the error
StackTrace:
HTTP Status 500 - Request processing failed; nested exception is java.lang.IllegalStateException: Invalid target for Validator [.validator.UserDataValidator#4366febc]: .model.UserInfo#4e3a061b
type Exception report
message Request processing failed; nested exception is java.lang.IllegalStateException: Invalid target for Validator [.validator.UserDataValidator#4366febc]: .model.UserInfo#4e3a061b
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: Invalid target for Validator [.validator.UserDataValidator#4366febc]: .model.UserInfo#4e3a061b
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
root cause
java.lang.IllegalStateException: Invalid target for Validator [.validator.UserDataValidator#4366febc]: .model.UserInfo#4e3a061b
org.springframework.validation.DataBinder.assertValidators(DataBinder.java:516)
org.springframework.validation.DataBinder.setValidator(DataBinder.java:507)
.controller.AccountDataController.initBinder(AccountDataController.java:65)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
org.springframework.web.method.annotation.InitBinderDataBinderFactory.initBinder(InitBinderDataBinderFactory.java:62)
org.springframework.web.bind.support.DefaultDataBinderFactory.createBinder(DefaultDataBinderFactory.java:53)
org.springframework.web.method.annotation.ModelFactory.updateBindingResult(ModelFactory.java:251)
Any suggestions on how to handle this would be helpful. Is there a way to make this work - having 2 different commandNames and trying to validate using one controller or do I need to update the commandName to one object and that object has all the classes inside it.
e.g.
class Parent{
UserData UserData;
UserInfo userInfo;
getter & setter
}
My Controller:
#Controller
#SessionAttributes("userData")
public class AController {
#Autowired
#Qualifier("userDataValidator")
private Validator validator;
#InitBinder
private void initBinder(WebDataBinder binder) {
System.out.println("getTarget: "+binder.getTarget()); ------------
binder.setValidator(validator);
}
#RequestMapping(value = "/data", method = RequestMethod.GET)
public String initForm(Model model){
UserData userData = new UserData();
model.addAttribute("userData", userData);
return "page1";
}//
#RequestMapping(value = "/user", method=RequestMethod.POST )
public String details(Model model, #Validated UserData userData, BindingResult result) {
*****
model.addAttribute("userinfo", userinfo);
return "page2";
}//
**EDIT**
#RequestMapping(value = "/create", method=RequestMethod.POST )
*****************
public String create(Model model, Userinfo userinfo, UserData userData) {
*********************user creation
}
**EDIT**
}
My JSPs
page1.jsp
<form:form method="POST" action="user" commandName="userData">
<form:label path="firstName"><b>Name</b></form:label> <br />
<form:input class="formLabel" path="firstName" />
****
</form>
page2.jsp
<form:form method="POST" action="create" commandName="userinfo">
***********fields
</form>
My validator
public class UserDataValidator implements Validator{
public boolean supports(Class<?> paramClass) {
return UserData.class.equals(paramClass);
}
public void validate(Object obj, Errors errors) {
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "firstName", "valid.firstName");
}
}
My Model
UserData.java
public class UserData {
String firstName;
getter & setter for firstName
}
Let me know if any more details are needed. Thanks.