The "unpacker" tries to pop up a dialog box. Make sure you have your DISPLAYvariable set.
If you don't have an X display, you can use a command-line argument that you cansend in to prevent that. It looks like it is '-console'... Seehttps://poormans-installer.dev.java.net/source/browse/poormans-installer/poormans-installer/installer/src/org/jvnet/poormans_installer/Main.java?rev=1.3&view=markup
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