Builder launch error in GaeNature, Google App Engine in Eclipse

I am getting intermittent error when starting Eclipse with a GAE project open. This prevents me from building my project. Sometimes I can clear it by deleting the contents of the "war / WEB-INF / classes" folder and restarting Eclipse. Sometimes I close the project, close eclipse, start eclipse, open the project and seem to be helping. The error has been happening for months and persists through the GAE plugin update. I can usually get Eclipse to work. Once it works, it works fine until I restarted it.

I am using GAE appengine-java-sdk-1.6.3 GWT 2.4.0 Designate 3.1 (love) Eclipse Indigo SR2 Windows 7 64-bit

It looks like there might be a race condition when starting Eclipse.

Any ideas?

These errors occur during build =======================

Errors executed by builder 'Java Builder' on project '*'. com / google / appengine / eclipse / core / nature / GaeNature

Errors running Google WebApp Web Project Validator builder on project "*". java.lang.NullPointerException

Failed to instantiate builder 'com.google.appengine.eclipse.core.projectValidator'.

The com.google.appengine.eclipse.core plugin was unable to load the com.google.appengine.eclipse.core.validators.GaeProjectValidator class.

An error occurred while automatically activating the com.google.appengine.eclipse.core package (841).

The com.google.appengine.eclipse.core plugin was unable to load the com.google.appengine.eclipse.core.validators.GaeProjectValidator class.

An error occurred while automatically activating the com.google.appengine.eclipse.core package (841).

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I also got this error when trying to open the Google / App Engine properties dialog in Eclipse

Unable to create the selected property sheet. An error occurred while automatically activating the com.google.appengine.eclipse.core package (841).

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2 answers


I also ran into this error today. I first checked the project properties to make sure something was out of place, but the Google App Engine tab doesn't even open properly. This gave a not very helpful error message: Unable to create the selected property page. An error occurred while automatically activating bundle com.google.appengine.eclipse.core (7).



After that I tried uninstalling and reinstalling the Google App Engine SDK and after restarting Eclipse GAE worked as intended.

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I also ran into this problem. To fix this, I just created a new workspace in Eclipse.



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