Java environment variable configuration problem, console command ' Java ' can run, ' Javac ' is not an internal or external command.

The new system finds this problem every time the JDK is installed, which is uncomfortable.

JDK default step installation, all OK, environment variables to find a site copycopy, this is the problem, most of the network environment variable configuration is the system variable JAVA_HOME:JDK path, this OK,

environment variable Path:%java_home%\bin;%java_home%\jre\bin; This is a problem, there is no javac.exe in the back of the Jre\bin, the front bin is covered, resulting in the inability to execute Javac,

Followed by classpath:.; %java_home%\lib\dt.jar;%java_home%\lib\tools.jar; this one is OK,

So just change the path variable to%java_home%\bin;

Java environment variable configuration problem, console command ' Java ' can run, ' Javac ' is not an internal or external command.