Ok, So I downloaded 2.3.2.2 runtime and deployed the report engine in
-Dorg.jbpm.report.engine.dir=D:\birt-runtime-2_3_2 (set this via JVM settings in Websphere 7 admin console).
I have copied the db2jcc.jar in D:\birt-runtime-2_3_2\ReportEngine\plugins\org.eclipse.birt.report.data.oda.jdbc_2.3.2.r232_v20090212\drivers
but i am still getting "can not load Report Query".
Now I have seen that as part of jbpm 5.1 installer, Report Engine needs to be installed in
${jboss.server.data.dir}/birt.
How about location for Websphere 7 ? Since I am installing Reprot Engine in D:\birt-runtime-2_3_2 (which is out side of Webpshere Location) that could be causing this issue of not being able to load the Report queries ?