Google App Engine部署错误：JDK不是JRE

Question

I'm trying to deploy the app with a .jsp file, which I figured is the reason I get an error because other projects without .jsp files have no problem.

When I try to deploy the app, I get the error : "Cannot get the System Java Compiler. Please use a JDK, not a JRE"

I tried resolving the problem using Mahmoud's solution here : Google app engine deployment : JDK not JRE

But once I have changed the eclipse.ini file, I launch Eclipse and get this error : "Version 1.7.0_80 of the JVM is not suitable for this product. Version 1.8 or greater is required"

Answer 1

You need to install JDK8 or JRE8 for Eclipse to execute and JDK7 for compile this application to build.

As mentioned in the error, JDK7 is not compatible with Eclipse. So you need to set your system JDK to 8 for Eclipse. Alternatively, you could instead modify the environment variables or startup script for Eclipse to reference JDK8 and avoid making this a system wide change.

Although for security purposes, I do recommend using the latest JDK/JRE as the system one for most cases.

Then within Eclipse, set the project JDK to 7.

Click through the following:

Windows -> Preferences -> Java -> Installed JRE

There you can remove the "JRE System Library", then you can add and configure another already installed JRE/JDK for this specific project.

You need the JDK for building which includes a JRE, but for deploying you only need the JRE.

The JDK includes the ability to compile Java source into executable code, where as the JRE can only execute that executable code.

You can download JDK from Oracle's site here: Oracle Java JDK 8