There doesn't seem to be a need to add the following to the Config log4j anymore (this was needed in grails 1.x see http://jira.codehaus.org/browse/GRAILSPLUGINS-1184)
Had some trouble with the sessions and kept getting this error
[java] WARNING: Nested in org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.RuntimeException: Session support is not enabled in appengine-web.xml. To enable sessions, put
As advised in the plugin documentation, added the following to Config, but it still didn't work!
google.appengine.sessionEnabled = true
Had to eventually update the /web-app/WEB-INF/appengine-web.xml file and uncomment the line below
<!-- <sessions-enabled>true</sessions-enabled> -->
Can now user grails run-app to run the development server instead of grails app-engine