InvalidDataAccessApiUsageException querying for a matching User

[sldahlin]

I have defined an interface for the User entity called UserRepository and it has defined one method that should allow it to find the matching user based upon the user_name:

public interface UserRepository
extends JpaRepository<User, Integer>
{ 
    User findByUserName( String userName );
}

Then in my controller code I have the following usage:

@Controller
@SessionAttributes
public class LoginController
{  
  @Autowired
  UserRepository userRepo;
  @RequestMapping( value  = "/loginForm", 
                   method = RequestMethod.POST )
  public String loginUser( @Valid LoginForm loginForm,
                           BindingResult result )
  {   
    User logUser = userRepo.findByUserName( loginForm.getUserName() );
    ...
  }
}

In the spring data jpa doc (http://static.springsource.org/sprin...ty-expressions) 1.3.2.2. Query creation it seems to indicate that this is what should be done. However when I run this at the login where the find would be executed I get:

org.springframework.dao.InvalidDataAccessApiUsageE xception: The type [null] is not the expected [EntityType] for the key class [class com.diodesign.fitness.jpa.entities.User].; nested exception is java.lang.IllegalArgumentException: The type [null] is not the expected [EntityType] for the key class [class com.diodesign.fitness.jpa.entities.User].


Any suggestions as to how to fix this?
Thanks

[gwa]

It seems your "loginForm.getUserName()" return null.

You cannot pass null parameter to method generated by springdata jpa

[sldahlin]

To test your thought I ran a print statement on loginForm.getUserName() just prior to the User logUser = userRepo.findByUserName( loginForm.getUserName() ); and it returns a string not a null.

However, I determined the problem seems to be with the jpa entities themselves. I corrected them and it is now working.

Thanks