Hi Shawn, No, I don't think that maxActive means that it's defining the maximum number of connections for the pool, I think it's strictly referring to the "[ .. ] maximum number of *active connections* that can be allocated from this pool at the same time. [ .. ]" (emphasis mine on active connections)
Here is the doc that I've been referring to - sorry for not linking it earlier: https://tomcat.apache.org/tomcat-9.0-doc/jdbc-pool.html On those other Tomcat servers is there a initialSize defined? Jim -----Original Message----- From: Beard, Shawn <sbe...@wrberkley.com.INVALID> Sent: Tuesday, December 15, 2020 2:49 PM To: Tomcat Users List <users@tomcat.apache.org> Subject: RE: jdbc connction pool issues [EXTERNAL] But wouldn’t maxActive mean the connection pool has a max of 50 conenctions? On other tomcat servers I have, maxActive is set to 50 and I verified im jmx that there are 50 max connections on the connection pool. Here though I checked jmx, sure enough, its max connections is 8. Shawn Beard Sr. Systems Engineer | BTS Middleware Engineering | +1-515-564-2528<tel:+1-515-564-2528> | sbe...@wrberkley.com<mailto:sbe...@wrberkley.com> -----Original Message----- From: Johnson, Jim <j1john...@unum.com> Sent: Tuesday, December 15, 2020 1:35 PM To: Tomcat Users List <users@tomcat.apache.org> Subject: RE: jdbc connction pool issues [EXTERNAL] ** CAUTION: External message Hi Shawn, I think you’re missing initialSize initialSize (int)The initial number of connections that are created when the pool is started. Default value is 10 maxActive (int) The maximum number of active connections that can be allocated from this pool at the same time. The default value is 100 It would make sense that 8 connections would be 80% utilized. I would try replacing maxActive with initialSize and seeing how that works for you. Good luck! - Jim From: Beard, Shawn <sbe...@wrberkley.com.INVALID> Sent: Tuesday, December 15, 2020 2:12 PM To: Tomcat Users List <users@tomcat.apache.org> Subject: jdbc connction pool issues CAUTION EXTERNAL EMAIL: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. We have this jdbc connection pool set up: <Resource name="jdbc/DataSource" auth="Container" type="javax.sql.DataSource" driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver" url="jdbc:sqlserver://hostname:1433;selectMethod=direct;databaseName=databasename;sendStringParametersAsUnicode=false" username="XXX" password="XXXXXX" maxIdle="20" minIdle="10" maxActive="50" maxWait="30000" testWhileIdle="true" testOnBorrow="true" validationQuery="SELECT 1"/> However we are getting this error: Resource Pool Limit Reached Time 12/15/20 11:48:00 AM Summary JDBC Connection Pool Catalina:class=javax.sql.DataSource,context=/XX,host=XXXXXXXXX,name="jdbc/DataSource",type=DataSource has reached 80% limit. Current pool size [8, Max pool size [8] Shouldn’t the max connections of the connection pool be 50 since maxActive is 50? 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