Is `java.sql.Connection` Thread-Safe?

Understanding Thread Safety of java.sql.Connection

Can multiple threads concurrently access an instance of the java.sql.Connection interface without data corruption or race conditions?

Answer:

Technically, if the JDBC driver adheres to the specification, java.sql.Connection is thread-safe. However, it is strongly recommended to avoid sharing connection instances between threads.

While the connection object itself may be thread-safe, it represents a handle to a physical database connection that supports only a single active thread at a time. Activities performed on the connection by one thread can interfere with operations performed by other threads, leading to unexpected behavior or deadlock.

To ensure thread-safe database access, always use a connection pool like Apache Commons DBCP. A connection pool maintains a pool of database connections, assigning each thread a dedicated connection from the pool. This approach guarantees that each thread has its own independent database connection, preventing resource conflicts and ensuring smooth and efficient database access.

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