结合我会了，但是怎么开发却不会，我不想看视频，感觉看不来，求大神给个思路，哪一步写java啊，hbm文件啊，controller，service那些

大神们呢

HTTP Status 500 -
type Exception report
message
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.NullPointerExceptionorg.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:561)javax.servlet.http.HttpServlet.service(HttpServlet.java:710)javax.servlet.http.HttpServlet.service(HttpServlet.java:804)
root cause
java.lang.NullPointerExceptioncom.gc.action.UserValidator.validate(UserValidator.java:23)org.springframework.validation.ValidationUtils.invokeValidator(ValidationUtils.java:63)org.springframework.web.servlet.mvc.BaseCommandController.bindAndValidate(BaseCommandController.java:398)org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:266)org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)javax.servlet.http.HttpServlet.service(HttpServlet.java:710)javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.
Apache Tomcat/6.0.16