Unable to Setup Postgres Due to Incorrect Driver

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Symptoms

The setup wizard crashes during a Postgres database configuration step. Logs contain:

2008-04-01 01:45:55,371 ERROR [http-8090-Processor4] [[Standalone].[localhost].[/].[action]] invoke Servlet.service() for servlet action threw exception
java.lang.UnsupportedClassVersionError: Bad version number in .class file
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1847)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:873)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1326)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1205)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at com.atlassian.confluence.setup.actions.AbstractSetupStandardDatabaseAction.checkDriver(AbstractSetupStandardDatabaseAction.java:20)
	at com.atlassian.confluence.setup.actions.SetupStandardDatabaseAction.execute(SetupStandardDatabaseAction.java:22)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)

Cause

The incorrect JDBC Driver is in place. jdbc4 is compiled for Java 1.6, whereas the jdbc3 jar file is compiled for for Java 1.5. Make sure you have the correct version for the correct JVM.

Resolution

Download the correct jar file and replace the old one in the /lib directory.

Last modified on Mar 30, 2016

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