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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   -   Installe...