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Editorial Team
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Asked: 2026-05-31T05:56:03+00:00

I have a stand-alone java application that makes some database read/write business on a

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I have a stand-alone java application that makes some database read/write business on a postgresql database. I used the isValid function available on a java.sql.Connection object in order to re-establish the database connection in case it is lost/fails possibly due to a network problem/crash. The following code snippet shows this idea shortly:

  //dbConnection is an instance of java.sql.Connection

  if(dbConnection.isValid(1)){
     reEstablishConnection();
  }

Nevertheless, at run-time I am getting an exception within the condition of above if block, which says that the method ‘isValid’ is not implemented yet. I am using the latest JDBC driver (v9.1-101) and my postgesql DBMS version is 8.3.9. I installed it using Yast2 on a SUSe Linux (SLES 11 SP2 – 64 bit). Can someone tell me me how I can check if the connection is lost programmatically in Java for postgresql? My inention is to reconnect automatically without the user intervention.

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1 Answer

  1. Editorial Team

    You could implement your own connection validity check function (something like executing "select 1" and returning true if 1 is returned from db without error).

    However, I suggest you to use connection pooling and I recommend to use the the Apache Tomcat Pool, that will handle for you validity checking on connections (among many other things)

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