Linux Default App Developed in Java

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http://askubuntu.com – Different Linux distributions have different default software. For example in some distributions Firefox is the default browser and in some Konqueror! In most of them Transmission is the bit-torrent client and ... As far as I know most of these applications have been developed using C, or C++ (vala also) or any other language that will be compiled into native Linux binary files. Do you know any software which has been developed in Java and has become a distribution's default app? (Except some IDEs such as NetBeans and Eclipse) Thanks (HowTos)