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Editorial Team
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Asked: 2026-05-24T00:21:53+00:00

I’m running this under windows vista cmd prompt: java -classpath C:\postgresql-8.4-701.jdbc4.jar -jar myJar.jar I

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I’m running this under windows vista cmd prompt:

java -classpath C:\postgresql-8.4-701.jdbc4.jar -jar myJar.jar

I get the error:

Cannot load postgresql driver. org.postgresql.Driver

The line causing the error is:

Class.forName("org.postgresql.Driver");

But in eclipse, the program works, and the postgresql library is referenced under the “Referenced Libraries”.

How to fix this please ? I need to run the program under the windows cmd prompt while getting the same result I get in Eclipse IDE.

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1 Answer

  1. Editorial Team

    I think this has to do with the fact that since you are using an executable jar, the classpath variable is being ignored.

    You should make sure that your myJar.jar has the correct classpath entries in its manifest file using 

    Class-Path: postgres...jar

    Make sure that its in the same directory as myJar.jar

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