I am researching 6 RDBMS plaforms for the time change issue and the water is a little murky. Running IDS 9.4 and above requires a patch 9.4.fc9 or 10.fc6 or the running of a util called JZTU. So what is not clear, does this util have to be run if all the java is upgraded to 1.5? If we are running HP or SUN? What about client only machines? From IBM:
The JTZU utility handles the following releases:
IBM-developed Java releases on all platforms except iSeries: 1.2.2, 1.3.1, 1.4.0, 1.4.1, 1.4.2, 5.0
IBM-modified Java 1.4.2 and 5.0 SDKs/JREs on Solaris and HP-UX platforms, shipped as part of an IBM-licensed product.
Let me guess, are you running peoplesoft? I ask that because that is the latest version of 9 they support. My understanding is you will not be affected but if anyone ever did create a java SP then you could have trouble. PS should be supporting the DST fix version, ask them if you are running PS.
Unfortunately there are no work arounds for HP so it's either remain as you are or upgrade.