IBM WAS 6.1 Error 500: LinkageError

I installed Actuate v10 (build 100B081204) on a pair of windows 2003 servers. I installed Actuate Information Console v10 on a websphere server and it's functional. I then modified the iPortal war to include the Mashboard customizations per the "installing into a customized version of Actuate information console 10) section in the Mashboard Installation doc, and redeployed. I can still log into the Information console as before. 
 
However, when I browse to <a class='bbc_url' href='http://ltltecwts18/bi10mb/mashboard.do?project=QuickStart'>http://ltltecwts18/bi10mb/mashboard.do?project=QuickStart</a>, the dreaded Error 500: LinkageError while defining class: com.actuate.mashboard.actions.MashboardAction Could not be defined due to: (com/actuate/mashboard/actions/MashboardAction) bad major version at offset=6 appears. 
 
I'm running IBM Websphere v6.1.0.19, which is using ibm java 1.5.0. I speculate that the mashboard I downloaded may be using 1.6???? 
 
Can anyone suggest an easy plan of action to correct this error? I'm under a deadline to get a proof of concept operational on a test server in the next day or two.

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Comments

PuckPuck

You are correct in assuming the Java 1.5 vs Java 1.6 issue.

Let's see what we can do, to get you a version using Java 1.5.

PuckPuck

Attached is mashboard.jar compiled under Java 1.5.

Hope this works for you.

JodyW

In keeping with the departmental motto "Nothing is Simple", I uninstalled the old version and deployed a war with your mashboard.jar. Unfortunately, it generated the same error.

At this point, I'll interject that I'm a novice at a) Websphere, b) BIRT c) iportal deployments and d)Java. However, when I examined the mashboard.class embedded in the new mashboard.jar, it still had a major version of 0x32 hex, which ties to J2SE 6.0. Can you elaborate on how you updated the jar, so perhaps I can try the same thing on my end.

JodyW

Here's the text displayed when I try to launch the QuickStart.

JodyW

OK, as a WAG, I attempted to resolve as follows:

I took the mashboard source code from the mashboard.zip download and dropped it into a new project in the BRD Pro. I then pulled in the external jars from the lib included in the mashboard.zip into the build path. I changed my java compiler compliance to 1.5 and rebuilt the class files. I then created a new mashboard.jar via the export and then dropped that into my websphere app. This has resolved the LinkageError.

Enlighten me if there's some other way that's a tad more streamlined.