There is a checkbox in Jar Bundler which allows to set working folder to inside package. Anybody knows how to do same thing using JarBundler ANT task? Thanks in advance!
I made it myself. Here's how:
<jarbundler dir="${deployment.dir}/bundled"
name="qqq"
mainclass="main.Main"
version="1.5"
jvmversion="1.6+"
icon="${deployment.dir}/Equals.icns"
workingdirectory="$APP_PACKAGE/Contents/Resources/Java">
Made a bundle and looked inside. There was a value "$APP_PACKAGE/Contents/Resources/Java". Jar Bundler uses it to set what i asked for. Thanks to those 9 people who at least read my question.