Java Application Bundled for Mac doesn't start

I'm using jarbundler 2.2.0 as suggested by other answers since the application should run on JRE 1.6 by Apple.

The bundle seems to be right, shows with the appropriate icon but clicking on it doesn't do anything. If I go into it's contents and try double clicking the jar with the main file specified works fine.

Is there a way to see what's happening? Some kind of error or log I can see?

Edit Requested Info.plist. Since the code is private I replaced some stuff with Application:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<plist version="1.0">
  <dict>
    <key>CFBundleName</key>
    <string>Application</string>
    <key>CFBundleShortVersionString</key>
    <string>2.2.0</string>
    <key>CFBundleGetInfoString</key>
    <string>Application version</string>
    <key>CFBundleAllowMixedLocalizations</key>
    <string>false</string>
    <key>CFBundleInfoDictionaryVersion</key>
    <string>6.0</string>
    <key>CFBundleExecutable</key>
    <string>JavaApplicationStub</string>
    <key>CFBundleDevelopmentRegion</key>
    <string>English</string>
    <key>CFBundlePackageType</key>
    <string>APPL</string>
    <key>CFBundleSignature</key>
    <string>????</string>
    <key>CFBundleVersion</key>
    <string>beta</string>
    <key>CFBundleIconFile</key>
    <string>SynamicD.icns</string>
    <key>CFBundleIdentifier</key>
    <string>net.sourceforge.javydreamercsw</string>
    <key>Java</key>
    <dict>
      <key>MainClass</key>
      <string>net.sourceforge.javydreamercsw.Main</string>
      <key>JVMVersion</key>
      <string>1.6.*</string>