Appengine jar files problem (appengine, java, eclipse)

After importing an appengine project into eclipse from git, you may run into some appengine jar problem.  some appengine jar files may not be included yet.

solution:

disable and re-enable "Use Google App Engine" (in project->properties).

This should re-add the jar files.

http://stackoverflow.com/questions/16176472/eclipse-appengine-sdk-jars-on-webinf-lib

where to download objectify jar

Download it from maven central repository.
http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.googlecode.objectify%22

You may also need to include its dependency libraries, guava.

Obviously, we can directly include it by adding it to maven pom, but some projects may not run maven.  so we still need the jar file.

Objectify jar used to be available from google code (https://code.google.com/p/objectify-appengine/downloads/list), but google code has closed.