No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK? 未配置JAVA环境变量

一、创建JAVA_HOME，值为：C:\Java\jdk1.8.0_321

 

 

二、创建CLASSPATH变量，值为：

.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;

 

 

 

三、path添加值，分别是

%JAVA_HOME%\bin

%JAVA_HOME%\jre\bin