Spring MVC报异常:org.springframework.web.util.NestedServletException: Request processing failed

在使用SpringMVC绑定基本类型(如String,Integer等)参数时,应通过@RequestParam注解指定具体的参数名称,否 则,当源代码在非debug模式下编译后,运行时会引发HandlerMethodInvocationException异常,这是因为只有在 debug模式下编译,其参数名称才存储在编译好的代码中。

譬如下面的代码会引发异常:



Java代码  Spring MVC报异常:org.springframework.web.util.NestedServletException: Request processing failed 


“收藏这段代码”)


@RequestMapping(value = “/security/login”, method = RequestMethod.POST)
public ModelAndView login(@RequestParam String userName, @RequestParam String password,
    HttpServletRequest request) {
    ………………….

如果使用Eclipse编译不会在运行时出现异常,这是因为Eclipse默认是采用debug模式编译的,但是如果使用Ant通过javac任务编译的话就会出现异常,除非指定debug=”true”。出现的异常如同:




org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.web.bind.annotation.support.HandlerMethodInvocationException:

Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView com.mypackage.security.controller.LoginController.login(java.lang.String,java.lang.String,javax.servlet.http.HttpServletRequest)]; nested exception is java.lang.IllegalStateException: No parameter name specified for argument of type [java language=”.lang.String”][/java], and no parameter name information found in class file either.
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:659)
……….

org.springframework.web.bind.annotation.support.HandlerMethodInvocationException: Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView com.mypackage.security.controller.LoginController.login(java.lang.String,java.lang.String,javax.servlet.http.HttpServletRequest)]; nested exception is java.lang.IllegalStateException: No parameter name specified for argument of type [java language=”.lang.String”][/java], and no parameter name information found in class file either.
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:171)
……….

java.lang.IllegalStateException: No parameter name specified for argument of type [java language=”.lang.String”][/java], and no parameter name information found in class file either.
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.getRequiredParameterName(HandlerMethodInvoker.java:618)
……….


最好的做法是通过@RequestParam注解指定具体的参数名称,如,上面的代码应该如此编写(注意@RequestParam部分):

Java代码  Spring MVC报异常:org.springframework.web.util.NestedServletException: Request processing failed “收藏这段代码”)

@RequestMapping(value = “/security/login”, method = RequestMethod.POST)    

public ModelAndView login(@RequestParam(“userName”) String userName,    @RequestParam(“password”) String password,   HttpServletRequest request) {    

   ………………….  

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