At least java-gcj-compat-dev, sun-java5-jdk, sun-java6-jdk, openjdk-6-jdk were added to provide java2-sdk in Hardy. java2-runtime dependency is wrong which is cause for bug #179447.
I tested the debdiff with openjdk-6 and it worked as expected. Possible backport may cause issues though as Gutsy doesn't have java2-sdk.
At least java-gcj- compat- dev, sun-java5-jdk, sun-java6-jdk, openjdk-6-jdk were added to provide java2-sdk in Hardy. java2-runtime dependency is wrong which is cause for bug #179447.
I tested the debdiff with openjdk-6 and it worked as expected. Possible backport may cause issues though as Gutsy doesn't have java2-sdk.