Your project must be configured to use a JDK in order to use JSPs

Your project must be configured to use a JDK in order to use JSPs   Unknown   Google App Engine Problem

Your project must be configured to use a JDK in order to use JSPs and error when Deploy to App Engine

Unable to update app: Cannot get the System Java Compiler. Please use a JDK, not a JRE.
See the deployment console for more details
Unable to update app: Cannot get the System Java Compiler. Please use a JDK, not a JRE.

------------ Deploying frontend ------------

Preparing to deploy:

Created staging directory at: 'C:\Users\XXX\AppData\Local\Temp\appcfg6354175596654057485.tmp'

Scanning for jsp files.

Compiling jsp files.

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

Debugging information may be found in C:\Users\XXX\AppData\Local\Temp\appengine-deploy6341377105080738517.log

How To Fix
Go to Window - Preference - Java - Installed JREs page to specify the location of your jre or JDK.

After press OK, console will display like this:

DataNucleus Enhancer (version 3.1.1) : Enhancement of classesDataNucleus Enhancer completed with success for 0 classes. Timings : input=468 ms, enhance=0 ms, total=468 ms. Consult the log for full detailsDataNucleus Enhancer completed and no classes were enhanced. Consult the log for full details