@PathVariable映射出现错误: Name for argument type

关于spring java.lang.IllegalArgumentException: Name for argument type [java.lang.String] 的错误http://blog.csdn.net/liuguanghaoputin/article/details/8695600
Name for argument type [java.lang.String] not available http://m.blog.csdn.net/blog/kouwoo/42869779
SpringMVC强大的数据绑定（2）——第六章注解式控制器详解——跟着开涛学SpringMVChttp://jinnianshilongnian.iteye.com/blog/1705701

为了这个问题费了很大劲，主要参考了了
1.http://stackoverflow.com/questions/2622018/compile-classfile-issue-in-spring-3 这个主要是因为ant编译导致类似的问题。

2. http://stackoverflow.com/questions/10305592/error-class-names-are-only-accepted-if-annotation-processing-is-explicitly-req 一开始src的写法有些问题，改为上面的写法便可。

发现问题：
一次做下载过程中，使用get方式进行下载，

Java代码

@ResponseBody

@RequestMapping(value = "/down/{_listid}/{type}", method = RequestMethod.GET)

public ResponseEntity<byte[]> download(@PathVariable String _listid, @PathVariable String type) throws IOException {

......

}

在idea和eclipse下面启动工程没问题，但是部署的时候就出了问题，后台一直提示500错误，但看不到错误细节，后来我直接复制地址，打开标签，直接粘贴url，才看到下面错误：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Name for argument type [java.lang.String] not available, and parameter name information not found in class file either.
org.springframework.web.servlet.FrameworkServlet.finalizeProcessing(FrameworkServlet.java:947)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:893)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:781)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:83)
com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
root cause

java.lang.IllegalArgumentException: Name for argument type [java.lang.String] not available, and parameter name information not found in class file either.
org.springframework.util.Assert.notNull(Assert.java:112)
org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.updateNamedValueInfo(AbstractNamedValueMethodArgumentResolver.java:134)
org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.getNamedValueInfo(AbstractNamedValueMethodArgumentResolver.java:112)
org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:81)
org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:75)
org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:156)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:117)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:647)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:603)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:859)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:883)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:781)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:83)
com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Name for argument type [java.lang.String] not available, and parameter name information not found in class file either.

原因：
这个错误主要是因为action的参数标注默认是debug级别，比如

Java代码

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

public ModelAndView login(@RequestParam String userName, @RequestParam String password,

HttpServletRequest request) {

此时userName的级别时debug级别，而在linux下编译时是忽略了这些标注，导致请求时就会找不到userName的参数。eclipse默认是debug级别的函数里面的参数名保留，但是ant编译就不行了。

解决方法1:写全@RequestParam的参数

Java代码

@RequestMapping("hello")

public String helloWorld(Map<String, Object> map, HttpServletRequest request,@RequestParam(value="hhh", required = false) String hhh) {

System.out.println("hello");

System.out.println("["+hhh+"]");

map.put("message", "test message111");

return "helloView";

}

写全@PathVariable的参数

Java代码

@RequestMapping(value="/users/{userId}/topics/{topicId}")

public String test(

@PathVariable(value="userId") int userId,

@PathVariable(value="topicId") int topicId)

解决方法2:修改build.xml,使用javac debug=true

Xml代码

</javac>

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@PathVariable映射出现错误: Name for argument type

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