Google App Engine NO_MODIFICATION_ALLOWED_ERR Eclipse build error - eclipse

I have installed Google App Engine plugin for Eclipse Indigo. I have created new Web Application Project with auto generated sample code. I unchecked "use Google Web Toolkit" when creating a project. My project looks as described here: Google App Engine HTTP Error 403
When building the project, I get the following error:
Errors occurred during the build.
Errors running builder 'Google App Engine Project Change Notifier' on project 'Test
NO_MODIFICATION_ALLOWED_ERR: An attempt is made to modify an object where modifications are not allowed.
I can run the servlet on the localhost, without any problems, however when I deploy the application, it doesn't work. Logs show:
Uncaught exception from servlet
java.lang.UnsupportedClassVersionError: test/Test : Unsupported major.minor version 51.0

The problem was caused by Java 7. Google App Engine supports Java 6 only.

I think this might be related to this issue the suggested workaround from the thread worked for me (pasted here for convenience):
As a temporary workaround, navigate to Project Properties -> Builders and disable the "Google App Engine Change Notifier" builder.

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JDK, SDK, and Gradle errors trying to build a Unity game for Android

The question:
My environmental variable JAVA_HOME is set to the location of my manual installation of Java, so why is Unity claiming it is an invalid directory?
Supporting information:
I'm using Unity to build a game for Android phones with the intent on putting it on the Google Play Store for a client. We need to use a Google Ad plugin for managing ads in the game. However, when I put the plugin into the project I can no longer build the game.
When going to Assets > External Dependency Manager > Android Resolver > Resolve, it claims it succeeds.
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Originally I had the same problem as: Intellij Gradle terminal ERROR: JAVA_HOME is not set
When I tried the solutions there as well as following the steps at: https://javatutorial.net/set-java-home-windows-10
I've tried setting the environment variable both to the independent java installation as well as the location of Unity's JDK module and got an error that they were both invalid directories:
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I already tried toggling these off and on, and even changing the installation targets to manual installations:
Possibly relevant information:
Using Unity 2019.3.0f6
InMobi Google Ads Unity Mediation Plugin Version 3.0.0
Windows 10 Pro
Java JDK 14.0.1
If Unity can't find JAVA_HOME it won't do anything, have you tried checking if you have that Environment Variable set correctly?
Check this thing.
Maybe you will need a Restart on you computer to see the changes.

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Unity uncaught translation error: illegalArgumentException

Unity 5.4.1p2 pro version
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Admob
Revmob
Vungle
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If you are using lite, then you need to disable play-services-ads.jar.
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https://developer.microsoft.com/en-US/windows/downloads/windows-10-sdk
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