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I have just downloaded and installed the Squirrel SQL client v3.5.0 (as 3.5.1 didn't work for me).

I have also downloaded the PostgreSQL 9.1 jdbc client.

When attempting to add the jdbc client within squirrel I receive an error message of ava.lang.UnsupportedClassVersionError: org/postgresql/Driver : Unsupported major.minor version 51.0.

java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)

Does anyone have this working on their system and if so any idea why mine doesn't work?

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It looks like you've used the JDBC4 version of PgJDBC but you're using an old Java version like 1.4.0.

Use a modern Java release, or use the JDBC3 driver that's compiled for older Java runtimes.

Update: Major/minor 51.0 is Java 7. So it looks like this JDBC release was incorrectly compiled with Java 7, instead of Java 6 (which is supposed to be used for the JDBC 4 release). Grab the latest driver release, it should be fine; if it isn't, please report the problem with the exact driver version and full stack trace to http://github.com/pgjdbc/pgjdbc/ along with your exact Java version.

I'd be interested in knowing exactly where you got this JDBC driver; any incorrectly built drivers should be removed from circulation.

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  • java -versionjava version "1.6.0_65" Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609) Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)
    – daemonofchaos
    Commented Feb 19, 2014 at 17:15
  • @KayakJim Hmm. At least one JDBC driver release was incorrectly built using Java 7. What driver version are you using exactly?
    – Craig Ringer
    Commented Feb 19, 2014 at 17:20
  • The file I'm working with is postgresql-9.1-903.jdbc4.jar. If you can advise how I can obtain the driver version I would be happy to get it.
    – daemonofchaos
    Commented Feb 19, 2014 at 20:58

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