title: SpringMvc+Hibernate: Getting NullPointerException in manually inserting data to table
body: <p>I am getting this error when i am trying to insert manually to MySql table with hibernate. 
  I am trying to insert some default data to my application but while inserting manually i am getting Null pointer exception. I am new in java programming so can't able to understand how to fix this error. If anyone can help me with this would me really appreciated..</p>
  
  <p><em>User_Role Class :</em></p>
  
  <pre><code>package com.sanjay31321.sys.model;
  
  
  import javax.persistence.Column;
  import javax.persistence.Entity;
  import javax.persistence.GeneratedValue;
  import javax.persistence.GenerationType;
  import javax.persistence.Id;
  import javax.persistence.Table;
  
  @Entity @Table(name="user_role")
  public class User_Role {
  
      @Id @Column @GeneratedValue(strategy=GenerationType.AUTO)
      private int id;
  
      @Column(name="role_name")
      private String name;
  
      public int getId() {
          return id;
      }
      public void setId(int id) {
          this.id = id;
      }
      public String getName() {
          return name;
      }
      public void setName(String name) {
          this.name = name;
      }
  
  }
  </code></pre>
  
  <p><em>InsertUserRole</em> </p>
  
  <pre><code>import org.springframework.beans.factory.annotation.Autowired;
  
  import com.sanjay31321.sys.model.User_Role;
  import com.sanjay31321.sys.service.UserRoleService;
  
  public class InsertUserRole {
      private static final Logger logger = LoggerFactory.getLogger(InsertUserRole.class);
  
      @Autowired
      private UserRoleService userRoleService;
  
      public void insert() {
          User_Role role = new User_Role();
  
          role.setId(1);
          role.setName("ROLE_ADMIN");
          logger.info("id : "+ role.getId() + " | Role : " + role.getName());
          userRoleService.addUserRole(role);
      }
  }
  </code></pre>
  
  <p><strong>Error:</strong></p>
  
  <p><pre>
  org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
      org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:965)
      org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:855)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
      org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
  root cause</p>
  
  <p>java.lang.NullPointerException
      com.sanjay31321.sys.preset.data.InsertUserRole.insert(InsertUserRole.java:22)
      com.sanjay31321.sys.preset.DefaultDataInstall.install(DefaultDataInstall.java:23)
      com.sanjay31321.sys.controller.DefaultDataController.postinstall(DefaultDataController.java:31)
      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:601)
      org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
      org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
      org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
      org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
      org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
      org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
      org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
      org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
      org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)
      org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:855)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
      org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:722)</p>
  
  <p>DefaultDataController class</p>
  
  <pre><code>package com.sanjay31321.sys.controller;
  
  import java.util.Locale;
  
  import javax.validation.Valid;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.stereotype.Controller;
  import org.springframework.validation.BindingResult;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestMethod;
  
  import com.sanjay31321.sys.preset.DefaultDataInstall;
  import com.sanjay31321.sys.preset.model.Install;
  
  @Controller
  public class DefaultDataController {
      private static final Logger logger = LoggerFactory.getLogger(DefaultDataController.class);
  
      @RequestMapping(value = "/install", method = RequestMethod.GET)
      public String getinstall(Locale locale, Install install) {
          logger.info("Welcome to Install Default Settings page ! GET METHOD : The client locale is {}.", locale);
          return "install";
      }
  
      @RequestMapping(value="/install", method=RequestMethod.POST)
      public String postinstall(@Valid  Install install, BindingResult result, Locale locale){
          logger.info("Welcome to Install Default Settings page ! POST METHOD : The client locale is {}.", locale);
          DefaultDataInstall settings = new DefaultDataInstall();
          settings.install();
          return "install";
      }
  }
  </code></pre>
  
  <p>DefaultDataInstall class</p>
  
  <code>package com.sanjay31321.sys.preset;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.sanjay31321.sys.preset.data.InsertCourse;
  import com.sanjay31321.sys.preset.data.InsertFeedback;
  import com.sanjay31321.sys.preset.data.InsertQuestion;
  import com.sanjay31321.sys.preset.data.InsertQuestionSet;
  import com.sanjay31321.sys.preset.data.InsertStudent;
  import com.sanjay31321.sys.preset.data.InsertSubject;
  import com.sanjay31321.sys.preset.data.InsertTeacher;
  import com.sanjay31321.sys.preset.data.InsertUser;
  import com.sanjay31321.sys.preset.data.InsertUserRole;
  
  public class DefaultDataInstall {
  
      private static final Logger logger = LoggerFactory.getLogger(DefaultDataInstall.class);
  
      public void install() {
  
          InsertUserRole role = new InsertUserRole();
          role.insert();
          logger.info("User Role data is installed");
      }
  }
  </code></pre>
  
  <p>I have attached the classes you asked.</p>