SpringMVC綁定基本類型參數的問題

在使用SpringMVC綁定基本類型（如String,Integer等）參數時，應通過@RequestParam註解指定具體的參數名稱，否則，當源代碼在非debug模式下編譯後，運行時會引發HandlerMethodInvocationException異常，這是因爲只有在debug模式下編譯，其參數名稱才存儲在編譯好的代碼中。

譬如下面的代碼會引發異常：

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

如果使用Eclipse編譯不會在運行時出現異常，這是因爲Eclipse默認是採用debug模式編譯的，但是如果使用Ant通過javac任務編譯的話就會出現異常，除非指定debug=”true”。出現的異常如同：
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.lang.String], 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.lang.String], 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.lang.String], and no parameter name information found in class file either.
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.getRequiredParameterName(HandlerMethodInvoker.java:618)
..........

最好的做法是通過@RequestParam註解指定具體的參數名稱，如，上面的代碼應該如此編寫（注意@RequestParam部分）：

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

參考：http://stackoverflow.com/questions/2622018/compile-classfile-issue-in-spring-3