> If you use any of the sun.* packages you always ask for trouble on major upgrades. IIRC, that caution about using sun.* packages was mentioned by Sun in docs

> If you use any of the sun.* packages you always ask for trouble on major upgrades. IIRC, that caution about using sun.* packages was mentioned by Sun in docs of early Java versions, like 1.2 / 1.4 etc. Not sure about more recent ones.