Sun made 1.4t EOL during 2008, when is pgjdbc codebase planned to move forward to 1.5 ?.
if anything, it should skip forward to OpenJDK 6
1.5 is going EOL this year, the problem is that real world deployments lag behind in upgrading, sometimes for the good reason of stability.
Moving to 1.6 will cut of more users then 1.5 would do, my personal opinion is that it from a community standpoint might be a bit too early to drop 1.5 support, especially since 1.6 dont offer so much new stuff as 1.5 did vs 1.4 .