#1 Unsupported major.minor version 49.0

[Horst-Peter Traub]

The version 1.0.0 was build with a JDK 1.5. Unfortunalty
the default target platform (option -target of javac) is JDK
1.5 itself. So if you use the prebuild jar files in a version
older than 1.5 you will recieve the
message "Unsupported major.minor version 49.0". This
problem can be fixed by rebuilding the jars on your
preferred JDK. You can also build the jars using 1.5 for
older versions using option -target in the javac command.

[Nico Max]

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Thats true and a duplicate to 1485523.