Creating a new connection for each user can be time consuming (often requiring multiple seconds of clock time), in order to perform a database transaction that might take milliseconds. Opening a connection per user can be unfeasible in a publicly-hosted Internet application where the number of simultaneous users can be very large. Accordingly, developers often wish to share a "pool" of open connections between all of the application's current users.

DBCP - Java Database Connection Pooling library

Proxool is a Java connection pool. It transparently adds connection pooling to your existing JDBC driver. The performance of database connections could be monitored. It's easy to configure using the JDBC API, XML, or Java property files. It complies with the J2SE standards.

Proxool - Java connection pool

Vibur DBCP is a concurrent, fast and fully-featured JDBC connection pool based on Java dynamic proxies. It supports a fairness parameter, statement caching, SQL queries logging, and Hibernate integration, among other features. 

Vibur DBCP - A concurrent and dynamic JDBC connection pool. 

Fast, simple, reliable. HikariCP is a "zero-overhead" production ready JDBC connection pool. At roughly 90Kb, the library is very light.

HikariCP - A high-performance JDBC connection pool

MongoPool is the tool that manages your connections to different clusters, maps databases to clients and allows you to work only with database names without worrying about creating and managing connections. You will never have to create a MongoClient everywhere you want to access a database again which enables you to write beautiful and maintainable code. 

MongoPool - Manages MongoDB Connections 

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DBCP - Java Database Connection Pooling library

Proxool - Java connection pool

Vibur DBCP - A concurrent and dynamic JDBC connection pool.

HikariCP - A high-performance JDBC connection pool

MongoPool - Manages MongoDB Connections

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Projects

DBCP - Java Database Connection Pooling library

Proxool - Java connection pool

Vibur DBCP - A concurrent and dynamic JDBC connection pool.

HikariCP - A high-performance JDBC connection pool

MongoPool - Manages MongoDB Connections

TechStack

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