Is Sharing java.sql.Connection Instances Across Threads Really Safe?

Understanding Thread Safety in the Context of java.sql.Connection

The java.sql.Connection interface establishes connections to a database. A common concern with multithreaded programming is whether shared resources like connections are thread-safe.

Question: Is it safe to share instances of classes implementing java.sql.Connection across different threads?

Answer:

Technically, if the JDBC driver adheres to the specification, Connection objects are thread-safe. However, sharing connections between threads is generally discouraged despite this thread safety.

The reason lies in the nature of database operations. When a connection is being actively used by one thread, other threads attempting to use the same connection will block. This hindering of parallel processing can significantly impact performance, especially in high-concurrency scenarios.

To avoid these performance bottlenecks, the recommended practice is to utilize a connection pool. Connection pools, such as Apache Commons DBCP, ensure that each thread obtains its own dedicated connection, eliminating the potential for thread contention and maximizing performance.

The above is the detailed content of Is Sharing java.sql.Connection Instances Across Threads Really Safe?. For more information, please follow other related articles on the PHP Chinese website!