Java.library.path

I got this error:
Exception in thread "main" java.lang.UnsatisfiedLinkError: no gcprovider
in java
.library.path
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1491)
        at java.lang.Runtime.loadLibrary0(Runtime.java:788)
        at java.lang.System.loadLibrary(System.java:834)
        at net.sourceforge.gjtapi.raw.dialogic.GCProvider.<clinit>
(GCProvider.ja
va:509)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:141)
        at net.sourceforge.gjtapi.GenericJtapiPeer.getProvider
(GenericJtapiPeer.
java:184)
        at CallCtlOutcall.main(CallCtlOutcall.java:20)
Press any key to continue . . .

My gjtapi located in jre/lib/ext. Please show me how to set
java.library.path.

Thank you in advance

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