eclipse - Google App Engine JSP can't deploy: java.lang.RuntimeException: Cannot get the System Java Compiler. Please use a JDK, not a JRE

Question

this is hopefully something simple but... Eclipse has been working relatively fine for everything except deploying to GAE.

I can run my GAE app locally, but when I try to deploy to google, I get this message:

java.lang.RuntimeException: Cannot get the System Java Compiler. Please use a JDK, not a JRE.

I have set the build path to JDK.

It also happens when trying to deploy the same project from more than one system (win7 and win8) so I suspect the problem is to do with the project itself. This particular project is existing and already running on google for years.

Interesting that this error only shows up when I have .jsp files in my app to deploy. If I remove the jsp files, it deploys without error. (kinda need the jsp files tho)

thanks

link to image of my build path

Answer 1

Waitting for answers