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Google App Engine NO_MODIFICATION_ALLOWED_ERR Eclipse build error

I installed the Google App Engine plugin for Eclipse Indigo. I created a new web application project with automatically generated sample code. When I created the project, I turned off the "Use Google Web Toolkit". My project looks like described here: Google App 403 HTTP Node Error

When creating a project, I get the following error:

Errors occurred during assembly.

Errors that run the "Google App Engine Project Change Notification" builder in the Test project

NO_MODIFICATION_ALLOWED_ERR: An attempt is made to modify an object if modifications are not permitted.

I can run the servlet on the local host without any problems, however when deploying the application it does not work. Logs show:

Do not disable servlet exception

java.lang.UnsupportedClassVersionError: test / Test: Unsupported major.minor version 51.0

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2 answers

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

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I think this may be due to this problem, the proposed solution from the thread working for me (inserted here for convenience):

As a temporary workaround, go to "Project Properties" → "Builders" and disable the "Google App Engine Component Change Notification" builder.

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