Greetings, I had assembled ffmpeg-java (which uses JNA) functions into webservice (.war, stateless) deployed into Glassfish v2.1 on Linux (64bit), it works fine until I modify the code and redeploy it (through Netbeans 6.5) , then it stops working until I restart/reload whole Glassfish :-( .

I get exception that some JNI library is already loaded in another classloader, but I beleive that when I redeploy webservice into glassfish, the old classloader is gone, so how can I get through ? I don't unfortunately don't know much about Classloaders andor JNA/JNI ...

Thanks in advance for any information or pointer towards right place to find a solution :-)

exception stack trace part (from glassfish domain server.log) : [#|2009-06-12T21:29:43.084+0200|SEVERE|sun-appserver2.1|com.sun.xml.ws.server.sei.EndpointMethodHandler|_ThreadID=19; _ThreadName=httpSSLWorkerThread-8080-4;_RequestID=3aa94d48-c8fd-4402-867b-bc328c459396;| Native Library
/opt/glassfish/domains/domain1/generated/jsp/j2ee-modules/ffmpegapi/loader/com/sun/jna/linux-amd64/libjnidispatch.so already loaded in another classloader java.lang.UnsatisfiedLinkError: Native Library /opt/glassfish/domains/domain1/generated/jsp/j2ee-modules/ffmpegapi/loader/com/sun/jna/linux-amd64/libjnidispatch.so already loaded in another classloader at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1716) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1647) at java.lang.Runtime.load0(Runtime.java:770) at java.lang.System.load(System.java:1005) at com.sun.jna.Native.loadNativeLibraryFromJar(Native.java:633) at com.sun.jna.Native.loadNativeLibrary(Native.java:574) at com.sun.jna.Native.<clinit>(Native.java:104) at net.sf.ffmpeg_java.AVFormatLibrary.<clinit>(AVFormatLibrary.java:18) at gnvn.earth.avclink.wsl.ffmpeg.FFmpegFile.<init>(FFmpegFile.java:39) <<-- webservice code

the FFmpegFile.java:39 line : final AVFormatLibrary AVFORMAT = AVFormatLibrary.INSTANCE;

which goes down to this code : public interface AVFormatLibrary extends FFMPEGLibrary { public static final AVFormatLibrary INSTANCE = (AVFormatLibrary) Native.loadLibrary( System.getProperty("os.name").startsWith("Windows") ? "avformat-51" : "avformat", AVFormatLibrary.class); .... }