Cannot deploy Google App due to errors - eclipse

I have created a simple application using the Google App Engine
Environment
Eclipse 4.2 (Juno) Plugin - http://dl.google.com/eclipse/plugin/4.2
JDK 7
I was able to create a sample application and run it locally.
When I try to deploy it gives me an error
Error in eclipse
Deploying 'applicationname' to Google has encountered a problem.
Unable to update app: The application contains Java 7 classes, but the --use_java7 flag has not been set.
See the deployment console for more details
Unable to update app: The application contains Java 7 classes, but the --use_java7 flag has not been set.
The logs show
Unable to update:
java.lang.RuntimeException: The application contains Java 7 classes, but the --use_java7 flag has not been set.
at com.google.appengine.tools.admin.Application.createStagingDirectory(Application.java:576)
at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:370)
at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:53)
at com.google.appengine.eclipse.core.proxy.AppEngineBridgeImpl.deploy(AppEngineBridgeImpl.java:433)
at com.google.appengine.eclipse.core.deploy.DeployProjectJob.runInWorkspace(DeployProjectJob.java:148)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
I see someone has encountered the same error before
Failed to deploy to Google App Engine because --use_java7 flag has not been set
I installed JDK 6 but I could not get the application to work either.
What are my alternatives to getting the application to work? - some thoughts...
Use prior version of plug in?
Install JDK 6 by itself?
Some other options?

You have to use JDK 6.
Similar Question
Java Overview Docs
App Engine runs Java applications using the Java 6 virtual machine (JVM). The App Engine SDK supports Java 5 and later, and the Java 6 JVM can use classes compiled with any version of the Java compiler up to Java 6.

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I think I found the problem you have
java version openjdk 11.0.12 2021-07-20
and you mustn't have any Java JDK version after Java 8, to explain why, all you need to know is that Google doesn't support any java version after 8 it's because that Google had a lawsuit with oracle (who support Java) for not fitting the standards with the new versions of Java, that is why google is trying to replase it with Kotlin, so:
uninstall java and
install Java 8 from here
If it still not working, get me the error and will update the answer, but now we solved the Java problem.

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