Configure Eclipse to pre-bundle App Engine classes into a single JAR for faster warm-up

Question

After some discussion with a colleague from another company that also uses App Engine, he told me that he managed to cut down his app warm up time from ~15 seconds to ~5 seconds

Answer 1

Note that as of version 1.7.4:

You can now package all the WEB-INF/classes/* classes into jar files. This can be done via the new

--enable_jar_classes option in the appcfg tools. By default, this option is not set.

http://code.google.com/p/googleappengine/wiki/SdkForJavaReleaseNotes