JDBC error in Apache tomcat

Hello, I am getting below error in java app log which is related to JDBC in Apache Tomcat. Appreciate if I can get direction in how to troubleshoot.

Caused by:
org.apache.tomcat.jdbc.pool.PoolExhaustedException:
[http-bio-8443-exec-17538] Timeout: Pool empty. Unable to fetch a
connection in 600 seconds, none available[size:200; busy:200; idle:0;
lastwait:600000].

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beer9Asked:
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gheistCommented:
How many http sessions you serve at that moment?
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beer9Author Commented:
it's very less, possibly 5 request per minute
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gheistCommented:
There is some resource leak in JDBC calls in your pages
Please check official doc to log leaks, that will lead you to the bad jsp page
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gheistCommented:
Sorry, but why B grade when I correctly identified resource leak vs resource shortage?
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beer9Author Commented:
Hi Gheist, Sorry about it. I am seeing browser issue and because of that I am also seeing "Too many requests in too short of time. Please try again later." from E-E. I could not choose A and got selected B by mistake.

possibly some issue on my side. Is there a way I can change B to A
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gheistCommented:
No problem. I asked moderators to click right...
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