GAE: Cannot get the System Java Compiler. Please use a JDK, not a JRE

Question

When trying to deploy my application to the Google App Engine server I get the following error: Cannot get the System Java Compiler. Please use a JDK, not a JRE.

A

Answer 1

As noted in the comments: Make sure the JDK is FIRST in your PATH.

Answer 2

I had the same issue with appengine sdk 1.8.1 and sts 3.6.4.

I tried adding vm properties to sts.ini file, added %JAVA_HOME% to the beginning of the path variable. But nothing was working as I kept getting the same error.

Cannot get the System Java Compiler. Please use a JDK, not a JRE

Then I found the issue was with Windows\system32\java* file. The appengine was reading the java from Windows\system32. There were three files.

java.exe
javaw.exe
javaws.exe

I replaced these files from JAVA JDK home as they were from JAVA JRE home during installation. After that, I restarted my sts and everything worked fine as I am able to deploy without issue.