Bug ID: 63983
           Summary: Jasper builds-up open files until garbage collection,
                    hitting Linux default limit of 4096.
           Product: Tomcat 9
           Version: 9.0.29
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Jasper
  Target Milestone: -----

Starting with Tomcat 9.0.29 (but not 9.0.27, and fixed by reverting), the Java
process builds-up open files until hitting the Linux default limit of 4096.

lsof shows that the files are all those that would be checked when determining
if a JSP file needs to be recompiled (the JSP file, its includes, and all
related *.tld files).

With "development=true" (the default), the files build-up in proportion to the
request load.  With "development=false", the files build-up more consistently
(around 100 files every 10 seconds in our case).

When a garbage collection occurs, the open file count drops back to around 100.

With our heap-space of 1024 MB, combined with some include-heavy JSP pages, we
run out of file handles before garbage collection, and requests fail with

We increased the limits in /etc/security/limits.conf as a workaround, but the
fix was to downgrade to Tomcat 9.0.27.

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