Google App Engine Tips

https://developers.google.com/appengine/docs/java/tools/maven
mvn archetype:generate -DarchetypeGroupId=com.google.appengine.archetypes  -DarchetypeArtifactId=appengine-skeleton-archetype  -DarchetypeVersion=1.8.7  -DgroupId=com.mycompany.myapp  -DartifactId=myapp -Dversion=BETA2  -Dpackage=com.mycompany 

https://developers.google.com/appengine/docs/java/tools/maven
Managing and Running a Project with the App Engine Maven Plugin
mvn clean install && mvn -pl myproject-ear appengine:devserver
<jvmFlags>
  <jvmFlag>-Xdebug</jvmFlag>
  <jvmFlag>-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n</jvmFlag>
</jvmFlags>
appengine-skeleton-archetype

http://repo2.maven.org/maven2/com/google/appengine/archetypes/appengine-skeleton-archetype/

https://developers.google.com/appengine/docs/java/tools/uploadinganapp
./appengine-java-sdk/bin/appcfg.sh update myapp/war