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How to reset the JDBC Connection Pool


How to reset the JDBC Connection Pool

By : Islam Ahmad
Date : November 17 2020, 01:00 AM
This might help you You can test connection before getting from the pool
By default Tomcat <7 uses commond-dbcp for Tomcat >= 7 it's jdbc-pool
code :
validationQuery=<TEST SQL>
testOnBorrow=true


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Need help understanding Tomcat thread pool and JDBC connection pool

Need help understanding Tomcat thread pool and JDBC connection pool


By : EricHuang
Date : March 29 2020, 07:55 AM
With these it helps
When TC starts up, does it create N threads, each with an applicationContext?
tomcat 7 JDBC connection pool - separate pool for each database?

tomcat 7 JDBC connection pool - separate pool for each database?


By : Mathavi Shanmugam
Date : March 29 2020, 07:55 AM
I hope this helps . Okay, I did some digging and figured this out myself. ( for the many kind folks on the tomcat-users mailing list!)
JB Nizet is right: if you are creating Tomcat database connection pools from Java code, each DataSource you instantiate literally is/represents a separate connection pool. This was surprising to me; coming from a .NET background, I assumed the Tomcat connection pooling would work like SqlServer/ADO.NET connection pooling: if you use two identical connection strings to get two database connections, these will both come from the same connection pool. However, in Tomcat, when instantiating DataSource objects from Java code, each new DataSource instance is a whole new connection pool. So, if you want to persist these connection pools across JAX-RS web service calls, for example, you need to build your own database-pool (DataSource) cache, put the DataSource instances (one per database) into it, and store it in an object that JAX-RS will persist across web service calls. I just did this, and it is working fine.
Tomcat JDBC connection pool VS c3p0 Connection pool

Tomcat JDBC connection pool VS c3p0 Connection pool


By : Jefim Kundzinovic
Date : March 29 2020, 07:55 AM
hope this fix your issue I've used it in one of my projects and it works great.
I can think of only one online article which compares Tomcat pool to C3P0: tomcatexpert.com. The C3P0 benches are however pretty off, their excuse was that they couldn't configure it to its max on Tomcat.
Java, JDBC connection pool, JDBC connection rollback

Java, JDBC connection pool, JDBC connection rollback


By : Yusuf Dursun
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I dont understand why connections coming directly from a connection pool need to be rolled back. Their state has to be idle otherwise you wouldn't be able to obtain them from the pool?!
Transactions have an influence to the performance. So if there are transactions than can be rolled back, there may be some query that cannot be executed because the dangling transaction is blocking them.
Tomcat jdbc connection pool - Pool-Cleaner Memory Leak

Tomcat jdbc connection pool - Pool-Cleaner Memory Leak


By : Philip Bradley
Date : March 29 2020, 07:55 AM
With these it helps Your JDBC drivers should be in $CATALINA_HOME/lib, and your database connection pools should be configured in the server.xml file using tags. You context.xml file for the webapp should then link to the global data source with a tag.
This way connections are global and shared by all webapps connecting to the same database. Connections will not be released when a webapp is stopped or restarted, because they don't belong to the webapp, they belong to Tomcat.
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