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Editorial Team
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Asked: 2026-05-25T14:14:38+00:00

Can jdbc connections which are closed due to database un-availability be recovered. To give

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Can jdbc connections which are closed due to database un-availability be recovered.

To give back ground I get following errors in sequence. It doesn’t look to be manual re-start. The reason for my question is that I am told that the app behaved correctly without
the re-start. So if the connection was lost, can it be recovered, after a DB re-start.

java.sql.SQLException: ORA-12537: TNS:connection closed

java.sql.SQLRecoverableException: ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
IBM AIX RISC System/6000 Error: 2: No such file or directory

java.sql.SQLRecoverableException: ORA-01033: ORACLE initialization or shutdown in progress

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  1. Editorial Team

    No. The connection is “dead”. Create a new connection.

    A good approach is to use a connection pool, which will test if the connection is still OK before giving it to you, and automatically create a new connection if needed.

    There are several open source connection pools to use. I’ve used Apache’s JDCP, and it worked for me.

    Edited:
    Given that you want to wait until the database comes back up if it’s down (interesting idea), you could implement a custom version of getConnection() that “waits a while and tries again” if the database doesn’t respond.

    p.s. I like this idea!

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