Google App Engine supports both Python and Java application development.
Can I have both in the same application?
Google App Engine supports both Python and Java application development.
Can I have both in the same application?
Can I run Java and Python code in the same app?
Each version of the app must specify a runtime language and it is possible to have version x of your app running Java, while version y is running Python. It would also be possible to use Jython.
Source: Google App Engine for Java FAQ
As far as I know, there are two ways: