Is java.sql.Connection thread safe?

If the JDBC driver is spec-compliant, then technically yes, the object is thread-safe, but you should avoid sharing connections between threads, since the activity on the connection will mean that only one thread will be able to do anything at a time.

Java.sql. Connection is an interface. So, it all depends on the driver's implementation, but in general you should avoid sharing the same connection between different threads and use connection pools.

Also it is also advised to have number of connections in the pool higher than number of worker threads.

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