I am doing some upgrade, client/server and test compatibility testing with 10.8 and am using this issue for tracking tests and results.
The first test was to create the system/wombat database with 10.5 and run Suites.All with 10.8 product jars and 10.5 derbyTesting.jar Then I verified I could reconnect with 10.5 and perform a few operations.
derbyTesting.jar. Environment for reference is:
Output attached as test10_8SoftUpgradeFrom10_5.out. There were Failures: 188, Errors: 109 which haven't been analyzed yet, but I skimmed them and didn't see anything that looked like data corruption.
Will also run
10.7 derbyclient.jar, derbyTesting.jar 10.8 other product jars
10.7 derbynet.jar derbyTesting.jar 10.8 other product jars.