MockMVC @RequestParam 사용시 IllegalArgumentException 발생
@RequestParam관련
@RequestParam annotation to bind Servlet request parameters. 파라미터 이름으로 바인딩처리되네요.
스프링이 제공하는 @RequestParam 를 사용하면 HTTP 요청 파라미터를 보다 편리하게 사용할 수 있습니다.
0. 상황
이전 게시글에서 @getMapping → @PostMapping으로 변경하여 Controller 테스트 중이었습니다.
실제 서버로부터 데이터를 받는 환경을 테스트하기 위해 @PostMapping에 파라미터값을 추가하였습니다.
다만 로그를 찍는 과정에서 아래와 같은 에러가 발생했습니다.
1. 에러 코드
jakarta.servlet.ServletException: Request processing failed: java.lang.IllegalArgumentException: Name for argument of type [java.lang.String] not specified, and parameter name information not found in class file either.
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1022)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:914)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:590)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:72)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:165)
at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:132)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.springframework.test.web.servlet.setup.MockMvcFilterDecorator.doFilter(MockMvcFilterDecorator.java:151)
at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:132)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.springframework.test.web.servlet.setup.MockMvcFilterDecorator.doFilter(MockMvcFilterDecorator.java:151)
at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:132)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.springframework.test.web.servlet.setup.MockMvcFilterDecorator.doFilter(MockMvcFilterDecorator.java:151)
at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:132)
at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:201)
at com.hoho.controller.MockMvcControllerTest.getPosts(MockMvcControllerTest.java:30)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
Caused by: java.lang.IllegalArgumentException: Name for argument of type [java.lang.String] not specified, and parameter name information not found in class file either.
at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.updateNamedValueInfo(AbstractNamedValueMethodArgumentResolver.java:183)
at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.getNamedValueInfo(AbstractNamedValueMethodArgumentResolver.java:160)
at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:106)
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:122)
at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:218)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:171)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:917)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:829)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
2. 원인
@RequetParam 애노테이션 사용시 value값을 사용하지 않아서 발생한 에러인듯하다.
AS-IS
public String post(@RequestParam String title, @RequestParam String content)
TO-BE
public String post(@RequestParam("title") String title, @RequestParam("content") String content)
동일한 현상 발생한 케이스
https://hanjoonkblog.blogspot.com/2016/02/name-for-argument-type-javalangstring.html
3. 해결
MockMVC Controller입장에서 보면, 서버로부터 String 파라미터로 title과 content가 각각 넘어오는데
이를 구분하기 위해 paramter name을 반드시 설정해줘야하는 것으로 보입니다.
