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Pylons on Jython

Pylons supports Jython as of v0.9.7.

Installation

The installation process is the same as CPython, as described in Getting Started. At least Jython 2.5b2 is required.

Deploying to Java Web servers

The Java platform defines the Servlet API for creating web applications. The modjy library included with Jython provides a gateway between Java Servlets and WSGI applications.

The snakefight tool can create a WAR file from a Pylons application (and modjy) that’s suitable for deployment to the various Servlet containers (such as Apache Tomcat or Sun’s Glassfish).

Creating .wars with snakefight

First, install snakefight:

$ easy_install snakefight

This adds an additional command to distutils: bdist_war.

Pylons applications are loaded from Paste, via its paste.app_factory entry point and a Paste style configuration file. bdist_war knows how to setup Paste apps for deployment when specified the --paste-config option:

$ paster make-config MyApp production.ini
$ jython setup.py bdist_war --paste-config production.ini

As with any distutils command the preferred options can instead be added to the setup.cfg in the root directory of the project:

[bdist_war]
paste-config = production.ini

Then we can simply run:

$ jython setup.py bdist_war

bdist_war creates a .war with the following:

  • Jython’s jar files in WEB-INF/lib
  • Jython’s stdlib in WEB-INF/lib-python
  • Your application’s required eggs in WEB-INF/lib-python

With the --paste-config option, it also:

  • Creates a simple loader for the application/config
  • Generates a web.xml deployment descriptor configuring modjy to load the application with the simple loader

For further information/usages, see snakefight’s documentation.

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