How to export KML file with JAK librery or libkml -java?

I use KML object in java. I want to export this object to file. I try to write this with JAK library,with the function KML.marshal() but it not succesed. I get this error:

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/xml/bind/marshaller/NamespacePrefixMapper
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at de.micromata.opengis.kml.v_2_2_0.Kml.createMarshaller(Kml.java:642)
    at de.micromata.opengis.kml.v_2_2_0.Kml.marshal(Kml.java:682)
    at de.micromata.opengis.kml.v_2_2_0.Kml.marshal(Kml.java:759)
    at com.nice.nicetrack.KMLGenerator.toKML(KMLGenerator.java:141)
    at com.nice.nicetrack.KMLGenerator.main(KMLGenerator.java:240)
Caused by: java.lang.ClassNotFoundException: com.sun.xml.bind.marshaller.NamespacePrefixMapper
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 17 more

I dont want use XML or String format. Only KMl object!! please- help me!! thanks!