On 10/12/2019 14:27, Christopher Schultz wrote:

<snip/>

> Would using org.apache.catalina.connector.RECYCLE_FACADES=true have
> made this problem go away? Or would the behavior have been the same,
> just less dangerous?

I think it would have triggered some NPEs in the background thread.

> I'm wondering if Tomcat could or should have another safety feature to
> help catch this sort of thing in development. In all my development
> environments, I have the JDBC connection pool size set to a fixed
> maximum of 1 connection. This means that any potential deadlocks in
> the application due to sloppy connection-management will cause pretty
> early because we'll get pool-fetch timeouts, missing-return-connection
> errors, etc.
> 
> Request object reuse has a measurable positive effect on performance
> in production,

It would be worth confirming that is still the case for the Request and
Response objects. I suspect it is but it would be good to get some
recent, hard data.

> but in development probably doesn't matter quite so
> much. In the same way that WebappClassLoader becomes inert when the
> application has been stopped, perhaps we could "shut-down" request /
> response / session objects that have been loaned to a
> request-processor thread.
> 
> Something like this:

I'm not sure why we need this over and above the RequestFacade object.

Mark

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