Now the funny part is that the installation wizard runs with java 6 jre, and will only accept the ojdbc6.jar file (the drivers compiled with java 6) for the drivers. When the ojdbc5.jar is selected, the wizard pops up an error message.
The installation will fail later on with this message in wpinstall.log:
(Feb 2, 2011 2:38:00 PM), Quickr.install, com.ibm.wps.install.ExternalCommandAction$OutputWatcher, msg2, StdOut: [echo] domain 'release'(Feb 2, 2011 2:38:00 PM), Quickr.install, com.ibm.wps.install.ExternalCommandAction$OutputWatcher, msg2, StdOut: [echo] DbtDbDriver 'oracle.jdbc.OracleDriver'(Feb 2, 2011 2:38:00 PM), Quickr.install, com.ibm.wps.install.ExternalCommandAction$OutputWatcher, msg2, StdOut: [echo] DbtDbLibrary 'C:/drivers/oracle/ojdbc5.jar'(Feb 2, 2011 2:38:00 PM), Quickr.install, com.ibm.wps.install.ExternalCommandAction$OutputWatcher, msg2, StdOut: [echo] DbtDbUser 'quickr'(Feb 2, 2011 2:38:00 PM), Quickr.install, com.ibm.wps.install.ExternalCommandAction$OutputWatcher, msg2, StdOut: [echo] DbtDbUrl 'jdbc:oracle:thin:@localhost:1521:QUICKR'(Feb 2, 2011 2:38:00 PM), Quickr.install, com.ibm.wps.install.ExternalCommandAction$OutputWatcher, msg2, StdOut: [echo] DbtDbName 'QUICKR'(Feb 2, 2011 2:38:00 PM), Quickr.install, com.ibm.wps.install.ExternalCommandAction$OutputWatcher, msg2, StdOut: [java] Exception in thread "main" java.lang.UnsupportedClassVersionError: (oracle/jdbc/OracleDriver) bad major version at offset=6
This clearly indicates that te OracleDriver class is not of the desired version. The underlying WebSphere Portal for the Quickr will use a java 5 runtime.
Now how can we use the ojdbc5.jar driver package during the installation? A good ol' switcheroo of files will do the trick! Rename the ojdbc6.jar driver to ojdbc5.jar, select that file in the wizard, and when you arrive on the summary screen of the wizard (before the installation starts), you replace the renamed ojdbc5.jar by the real ojdbc5.jar.
We fooled the wizard, the installer will use the correct oracle drivers.
Nice article Arend , you have indeed cover unsupportedclassversionerror with great details.by the way some time its not easy to shift to higher version of JDK due to some other dependency and best approach is to find the culprit classes or jar and get the compatible version of those jar based on your execution environmen
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