Hi Everyone,

At the moment JSP and JSF are being activated for all web deployments, which is relatively expensive as this involves quite a bit of class loading and TLD parsing. 

To give an idea about how much time this is actually taking I did a test with a large number of small servlet only deployments both with and without JSF, and JSF was accounting for 20% of total deployment time even though it was not actually used by any of the deployments.

It also had a significant effect on memory usage, as the parsed TLD's are retained, and are quite large.

The root of this issue is that the spec does not define clear activation criteria for these technologies. I am proposing that we formalise some activation criteria, so that we can avoid activating them if they are not required.

JSP:

For JSP I think we can use the following criteria (if either one is satisfied JSP is activated):

- The presence of a JSP file mapping in web.xml

- The presence of JSP files inside the deployment

- The presence of JSF

One thing that does concern me is that searching for JSP files in this way may be expensive in large deployments with lots of web resources. An alternate approach may be to try and make JSP lazy, so class loading and TLD passing does not happen until a request for a JSP file arrives.

JSF:

This is much less clear. I think we can use the presence of one of the following:

- faces-config.xml

- The faces servlet in web.xml

- Something else?

I am not really sure what effect this will have on backwards compatibility though. If this is a compatibility problem we could add an attribute to the JSF subsystem to restore the old mode.

Does this sound reasonable?  

Stuart

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