存在可选的long参数但不能转换为空值

时间：2014-06-01 07:24:05

标签： java java-ee exception controller dao

我正在网上开发所以我有一个ajax函数，它调用一个调用DAO函数的控制器函数（在DB上进行更改）。我在控制器函数中得到了上面的例外..

控制器功能：

@RequestMapping(value="/changeIsPublic", method=RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public  @ResponseBody boolean changeIsPublic(HttpServletRequest request, Locale locale, Model model, long transactionId, boolean isPublic) {
    boolean result = false; 
    try {
            boxDao.changeIsPublicStatus(transactionId, isPublic);
            result = true;

        } catch (Exception e) {
            logger.debug("Failed to publish transaction. transaction ID: " + transactionId + e.getMessage());
        }
        return result;
}

DAO功能：

public Box changeIsPublicStatus(long id, boolean isPublic) {
    Criteria criteria = getCurrentSession().createCriteria(Box.class);
    criteria.add(Restrictions.eq("id", id));
    Box transaction = (Box) criteria.uniqueResult();
    transaction.setIsPublic(isPublic);
    return transaction;
}

异常：

    SEVERE: Servlet.service() for servlet [appServlet] in context with path [/goblin] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Optional long parameter 'transactionId' is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.] with root cause
java.lang.IllegalStateException: Optional long parameter 'transactionId' is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.
    at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.handleNullValue(AbstractNamedValueMethodArgumentResolver.java:188)
    at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:94)
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:77)
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:162)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:123)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:149)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.yes.java.security.AuthenticationFilter.doFilter(AuthenticationFilter.java:105)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)    `

8 个答案:

答案 0 :(得分：14)

当我使用Jackson REST Web服务（RESTful Spring Controllers）时出现此错误。问题是我忘记了def insertionsort(list1): for index in range(1,len(list1)): value = list1[index] position = index while position > 0 and list1[position-1] > value: list1[position]=list1[position-1] position = position-1 list1[position] = value return(list1) 注释，该注释告诉Web服务它应该在哪里接收输入以产生响应，因此它不知道我应该在哪里传递输入。我的修复是：

@PathVariable

答案 1 :(得分：11)

异常消息指导您。将长类型更改为长

答案 2 :(得分：8)

错误几乎是不言自明的：你不能将原语声明为null，例如：private int myNumber = null;将无法编译。因此，不要使用long使用Long，而应该很高兴。

答案 3 :(得分：4)

注释： @RequestParam(defaultValue = "0")。

答案 4 :(得分：0)

What is the difference between long and Long in android code?初学者的一些基本概念

  

Long是一门课。 long是原始的。这意味着Long可以为null，而long不能为null。 Long可以走到任何需要Object的地方，而Long不会（因为它不是从Object派生的类）。

     

Java通常会自动将Long转换为long（反之亦然），但是不会将其转换为null（因为long不能为null），并且在需要传递时需要使用Long版本一个类（例如在通用声明中）。

答案 5 :(得分：0)

@Ahmed Tawila-他提到我犯了同样的错误。我忘记在控制器中方法的原始类型之前添加@PathVariable注释。

代码错误：未在长整型之前定义必需的注释

@RequestMapping(method = RequestMethod.DELETE, value = "/categories/{categoryId}/subcategories/{id}")
public void deleteSubCategory(long id) throws Exception {
    subCategoryService.delete(id);
}

正确的代码：添加了注释（@PathVariable）

@RequestMapping(method = RequestMethod.DELETE, value = "/categories/{categoryId}/subcategories/{id}")
public void deleteSubCategory(@PathVariable long id) throws Exception {
    subCategoryService.delete(id);
}

答案 6 :(得分：0)

这有时是由于使用PathParam而不是PathVariable引起的。这可能只是另一个解决方案。我们也可以看看它。在使用JpaRepository接口实现Spring数据jpa时，我遇到了类似的情况。

答案 7 :(得分：0)

就我而言，我在 Controller 的请求正文中缺少@RequestBody注释！

public View updateView(@RequestBody int id){
}

希望它对某人有帮助！

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