Question

当我从用户名字段中删除时，我正在尝试完成验证，但是对ajax和jquery是新手。在我的代码下面，由于在jquery上是新手，我可能会有很多错误。我收到以下错误：

“NetworkError：500内部服务器错误 -

http://localhost:8084/crimeTrack/validateUserName.htm?userName=hello"

使用Javascript：

        $(document).ready(function(){
            $('#userName').blur(function(evt){
                CheckAvailability();                    
            });
        });         

        function CheckAvailability() {
            $.getJSON(
                "validateUserName.htm",
                {userName: $('#userName').val()},
                function(){
                    alert('Sorry UserName Taken');
            });
        }

@Controller：OfficerRegistrationController

 @RequestMapping(value="validateUserName.htm", method=RequestMethod.GET)
 public boolean validateUserName(@RequestParam String userName) throws Exception{
     if (officerdao.OfficerExist(userName)) {
         return true;
     }
     return false;
 }

的Servlet

  <bean name="/validateUserName.htm" class="com.crimetrack.web.OfficerRegistrationController"/>

OfficerDao

public boolean OfficerExist(String userName){

    logger.info("About to check if officers existing");

    String sql = "SELECT userName FROM crimetrack.tbloffficers WHERE userName = ?";
    Map<String, Object> results = getJdbcTemplate().queryForMap(sql, userName);
    String dbUserName = (String)results.get("userName");

    logger.info("Checking if officers exist "+sql);

    if (dbUserName.equals(userName)) {

        return true;

    }else{

        return false;
    }       
}

错误日志：

31693 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - Bound request context to thread: org.apache.catalina.connector.RequestFacade@64e5b2  
31693 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - DispatcherServlet with name 'crimetrack' processing GET request for [/crimeTrack/validateUserName.htm]  
31693 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - Testing handler map [org.springframework.web.servlet.handler.SimpleUrlHandlerMapping@18ddc48] in DispatcherServlet with name 'crimetrack'  
31693 [http-8084-1] DEBUG org.springframework.web.servlet.handler.SimpleUrlHandlerMapping  - No handler mapping found for [/validateUserName.htm]  
31693 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - Testing handler map [org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping@f6852d] in DispatcherServlet with name 'crimetrack'  
31703 [http-8084-1] DEBUG org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping  - Mapping [/validateUserName.htm] to HandlerExecutionChain with handler [com.crimetrack.web.OfficerRegistrationController@1735602] and 1 interceptor  
31703 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - Testing handler adapter [org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter@15fc606]  
31703 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - Testing handler adapter [org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter@1966070]  
31703 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - Testing handler adapter [org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter@1959352]  
31703 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - Last-Modified value for [/crimeTrack/validateUserName.htm] is: -1  
31713 [http-8084-1] DEBUG org.springframework.web.bind.annotation.support.HandlerMethodInvoker  - Invoking request handler method: public boolean com.crimetrack.web.OfficerRegistrationController.validateUserName(java.lang.String) throws java.lang.Exception  
31713 [http-8084-1] DEBUG org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver  - Resolving exception from handler [com.crimetrack.web.OfficerRegistrationController@1735602]: java.lang.NullPointerException  
31723 [http-8084-1] DEBUG org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver  - Resolving exception from handler [com.crimetrack.web.OfficerRegistrationController@1735602]: java.lang.NullPointerException  
31723 [http-8084-1] DEBUG org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver  - Resolving exception from handler [com.crimetrack.web.OfficerRegistrationController@1735602]: java.lang.NullPointerException  
31723 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - Cleared thread-bound request context: org.apache.catalina.connector.RequestFacade@64e5b2  
31723 [http-8084-1] DEBUG org.springframework.web.servlet.DispatcherServlet  - Could not complete request  
java.lang.NullPointerException  
    at com.crimetrack.web.OfficerRegistrationController.validateUserName(OfficerRegistrationController.java:125)  
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)  
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)  
    at java.lang.reflect.Method.invoke(Unknown Source)  
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)  
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)  
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)  
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)  
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)  
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)  
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)  
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)  
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)  
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)  
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)  
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)  
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)  
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)  
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)  
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)  
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)  
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)  
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)  
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)  
    at java.lang.Thread.run(Unknown Source)  
31723 [http-8084-1] DEBUG org.springframework.web.context.support.XmlWebApplicationContext  - Publishing event in WebApplicationContext for namespace 'crimetrack-servlet': ServletRequestHandledEvent: url=[/crimeTrack/validateUserName.htm]; client=[127.0.0.1]; method=[GET]; servlet=[crimetrack]; session=[null]; user=[null]; time=[30ms]; status=[failed: java.lang.NullPointerException]  
31723 [http-8084-1] DEBUG org.springframework.web.context.support.XmlWebApplicationContext  - Publishing event in Root WebApplicationContext: ServletRequestHandledEvent: url=[/crimeTrack/validateUserName.htm]; client=[127.0.0.1]; method=[GET]; servlet=[crimetrack]; session=[null]; user=[null]; time=[30ms]; status=[failed: java.lang.NullPointerException]

浏览器错误

org.springframework.web.util.NestedServletException：请求处理失败;嵌套异常是java.lang.IllegalArgumentException：无效的处理程序方法返回值：false org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:894） org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:778） javax.servlet.http.HttpServlet.service（HttpServlet.java:617） javax.servlet.http.HttpServlet.service（HttpServlet.java:717）

根本原因

java.lang.IllegalArgumentException：无效的处理程序方法返回值：false org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter $ ServletHandlerMethodInvoker.getModelAndView（AnnotationMethodHandlerAdapter.java:971） org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod（AnnotationMethodHandlerAdapter.java:438） org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle（AnnotationMethodHandlerAdapter.java:424） org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:923） org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:852） org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:882） org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:778） javax.servlet.http.HttpServlet.service（HttpServlet.java:617） javax.servlet.http.HttpServlet.service（HttpServlet.java:717）

Answer 1

评论已经失控，所以要创建一个可以尝试的事情的答案，并在事情发生变化时进行编辑。

我假设您可能正在使用queryForMap方法签名中的SimpleJdbcTemplate

queryForMap(String sql, Object args...)

要尝试的一件事是代替Map，可能只是尝试查询Object，因为您知道自己只是在查询用户名。

即

getJdbcTemplate().queryForObject("select username...", String.class, userName)

我还会专门为这个DAO创建一个JUnit集成测试，它针对数据库进行攻击，以便更轻松地调试导致问题的原因。有时异常会被消耗重新抛出等等，并且实际上导致问题的原因会让人感到困惑。

尝试这些并让我知道会发生什么，可能会让事情更容易调试。

示例JUnit可能如下所示

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"path/to/app/config.xml"})
public class IntegrationTestOfficerDao {
  @Autowired
  private OfficerDao officerDao;

  @Test
  @Rollback(value=true)
  @Transactional
  public void testUserExists()
  {
     // This would create the user and persist it
     OfficerUser user = createUser(...);
     assertTrue(officerDao.OfficerExist(user.username()));
  }
}

SpringMvc和Ajax Restful Web服务

1 个答案: