centos 更新jdk版本
删除当前版本yum-yremovejava-1.8.0-openjdkyum-yremovetzdata-java.noarch查询版本yumsearchopenjdk安装新版yuminstalljava-latest-openjdk验证java-version
jdk
Windows JDK 环境变量设置
新增系统环境变量JAVA_HOMEVALUE:D:\Develop\Java\jdk1.8.0_202NAME:CLASSPATHVALUE:.;%JAVA_HOME%\bin;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar编辑PATH环境变量，新增
No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
Maven打包出现Nocompilerisprovidedinthisenvironment.PerhapsyouarerunningonaJREratherthanaJDK?在Windows中CMD打包项目，一般都是没有设置环境变量;在EclipseIDE上，进入Window>Prefere
