[Libguestfs] How to run the java demo code contained in libguestfs package ???

Hi all, I would like to use libguestfs to manage the virtual disk images of virtual machines on XenServer, which is a virtualization platform. When I try to do some test of the Java codes contained in the libguestfs package, the following error promped up: Exception in thread "main" java.lang.UnsatisfiedLinkError: no guestfs_jni in java.library.path at java.lang.ClassLoader.loadLibrary(Unknown Source) at java.lang.Runtime.loadLibrary0(Unknown Source) at java.lang.System.loadLibrary(Unknown Source) at com.redhat.et.libguestfs.GuestFS.<clinit>(GuestFS.java:44) at test.GuestFS005Load.main(GuestFS005Load.java:27) It seems that I need to build guestfs_jni before I could use libguestfs through Java. But I am not clear how to get this "guestfs_jni"....... Does anybody know how to fix this problem? Thank you very very much!