Hi Dokho,
You have to convert them one by one. jar2ikvmc simply analyzes jar files (see command line options) and detects dependencies between jars, then it generates batch file that you can use to convert your jars to .NET dlls. In you case it would be:
ikvmc xbean.jar -target:library
ikvmc js.jar -target:library -r:xbean.dll
ikvmc commons-lang-2.6.jar -target:library
ikvmc pw-swift-core-SRU2014-7.6-B1410151122.jar -target:library -r:commons-lang-2.6.dll
Make sure you put all required jar files into input directory.
Usually you will get some warnings during run of ikvmc, once it generates stubs for missing methods / classes. It is ok if they are not critical for your app.