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Filters initialized before context is ready  RSS feed

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My application contains filters which each have a static SessionFactory variable set. This is instantiated in the init() method, like so:

The filters are declared in web.xml, and there are multiple hibernate.cfg.xml files, due to the app needing to connect to multiple databases. The hibernate configuration files all declare a session factory object with a name attribute intended to match the factoryJndiName mentioned above.

Here is an example of one of my filters.

When I try to deploy the app on Tomcat 6.032, it runs the init() method for each filter before the context has had a chance to store the JNDI names for each SessionFactory. This causes the following error when executing ctx.lookup.

How do I ensure that the context has the jndi names for the SessionFactories set up before Tomcat initializes the filters?
It is sorta covered in the JavaRanch Style Guide.
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