Warning Msg for bad Java version

[jstein]

Josm needs an special version to run properly.

On Linux systems there is often a bunch of Java-Versions available. Command java executes one that is set to default. The other ones need the full path.

Many newcomers are confronted with strange problems, because josm was run in a wrong java environment by accident.

It would be a big help, if josm would give the following Message at startup, if its not run in the optimal Java engine.

 Warning
Josm was executet with 
HamAndEggs Java 1.2.3
This may cause strange effects. We suggest to use Sun Java 1.6.... instead.

[x] show this warning on every startup

[bastiK]

JOSM runs with sun java and openjdk/icedtea. What else is there?

We will use java 6 after next release, so we certainly need to explain this to the users that try to run JOSM with java 5.

[jstein]

i had plenty of trouble using openjdk and WMS. It did not work most time and was extreme slow. (5 minutes per square) Since i switched to Sun Java 6 for josm it runs even a lot faster. It needs only 50% the time to load mapdata from osmserver and its more stable.

I am using 'josm latest'