I upgraded jdk to version 7_45. After compiling and executing the jar, which works fine, i packed it into an application bundle. But unfortunately i get this error message \
I kinda solved the problem. I took a look at a Processing app bundle. I think it mainly has to do with following lines in the info.plist which were missing in mine:
<key>JVMOptions</key>
<array>
<string>-Xdock:icon=Contents/Resources/fireworks.icns</string>
<string>-Dapple.laf.useScreenMenuBar=true</string>
<string>-Dcom.apple.macos.use-file-dialog-packages=true</string>
<string>-Dcom.apple.macos.useScreenMenuBar=true</string>
<string>-Dcom.apple.mrj.application.apple.menu.about.name=Main</string>
<string>-Dcom.apple.smallTabs=true</string>
</array>