Java (자바)

Error (오류)

warning: javax\servlet\http\HttpServletRequest.class(javax\servlet\http:HttpServletRequest.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\http\HttpServletResponse.class(javax\servlet\http:HttpServletResponse.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\http\HttpSession.class(javax\servlet\http:HttpSession.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\Filter.class(javax\servlet:Filter.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\FilterChain.class(javax\servlet:FilterChain.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\FilterConfig.class(javax\servlet:FilterConfig.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletContext.class(javax\servlet:ServletContext.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletException.class(javax\servlet:ServletException.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletRequest.class(javax\servlet:ServletRequest.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletResponse.class(javax\servlet:ServletResponse.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\http\HttpServletRequest.class(javax\servlet\http:HttpServletRequest.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\http\HttpServletResponse.class(javax\servlet\http:HttpServletResponse.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\http\HttpSession.class(javax\servlet\http:HttpSession.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\Filter.class(javax\servlet:Filter.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\FilterChain.class(javax\servlet:FilterChain.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\FilterConfig.class(javax\servlet:FilterConfig.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletContext.class(javax\servlet:ServletContext.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletException.class(javax\servlet:ServletException.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletRequest.class(javax\servlet:ServletRequest.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletResponse.class(javax\servlet:ServletResponse.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\http\HttpServletRequest.class(javax\servlet\http:HttpServletRequest.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\http\HttpServletResponse.class(javax\servlet\http:HttpServletResponse.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\http\HttpSession.class(javax\servlet\http:HttpSession.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\Filter.class(javax\servlet:Filter.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\FilterChain.class(javax\servlet:FilterChain.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\FilterConfig.class(javax\servlet:FilterConfig.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletContext.class(javax\servlet:ServletContext.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletException.class(javax\servlet:ServletException.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletRequest.class(javax\servlet:ServletRequest.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: javax\servlet\ServletResponse.class(javax\servlet:ServletResponse.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.

Problem (문제)

JDK1.7을 지원하는 클래스가 존재하는데,

JDK1.6 환경에서 컴파일(Compile)하여 경고를 하는 것이다.

Solved (해결)

나의 경우에는 JDK1.6환경을 기준으로 컴파일하는 것이 목표였기 때문에, 

경고가 뜬 javax.servlet를 다운그레이드(Down Grade)하였다.

3.1 => 2.4

Gradle(그래들)로 예를 들면 다음과 같다.

1. Gradle Depedencies설정 (build.gradle)

BEFORE

providedCompile  group: 'javax.servlet', name: 'javax.servlet-api', version: '3.1.0'

AFTER

providedCompile  group: 'javax.servlet', name: 'servlet-api', version: '2.4'

2. War Build

$ gradle clean war