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Java Forum / General / February 2007UnsatisfiedLinkError In Exported Jar But Not In Eclipse
My application, which depends on a native DLL located in C:\WINDOWS, is running fine in eclipse. However, if I export the jar and then run it on the command line, I get an UnsatisfiedLinkError on the native call. The strange thing is I never told eclipse where to find the DLL (it just automatically found it WINDOWS), so I can't figure out why the command line java is not finding it..... Any ideas? Thanks, cpp > My application, which depends on a native DLL located in C:\WINDOWS, > is running fine in eclipse. However, if I export the jar and then > run it on the command line, I get an UnsatisfiedLinkError on the > native call. Post the full text of the exception. I'll assume that C:\WINDOWS is in your PATH... /gordon  Signature[ don't email me support questions or followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e Thanks for the reply, Gordon. >Post the full text of the exception. Exception in thread "Thread-0" java.lang.UnsatisfiedLinkError: open at net.sourceforge.jpcap.capture.PacketCapture.open(Native Method) at net.sourceforge.jpcap.capture.PacketCapture.open(PacketCapture.java:6 3) at network.Sniffer.startSniff(Sniffer.java:132) at network.Sniffer.run(Sniffer.java:170) at java.lang.Thread.run(Unknown Source) >I'll assume that C:\WINDOWS is in your PATH... Yes, it is. > Thanks for the reply, Gordon. > [quoted text clipped - 9 lines] > at network.Sniffer.run(Sniffer.java:170) > at java.lang.Thread.run(Unknown Source) From the error message it is clear that the DLL was found and successfully loaded. The error is that it does not appear to contain the expected method "open". Have you compiled the DLL or did it come pre-compiled with jpcap? Use a tool like dumpbin, depends or quickview to display the actual contents of the DLL. Confirm that it does contain the method, and that the symbol name has not been mangled by the compiler. Do you have different versions of the jpcap library installed on your system? /gordon Signature[ don't email me support questions or followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e >From the error message it is clear that the DLL was found and >successfully loaded. The error is that it does not appear to contain >the expected method "open". I see. But everything is working fine from eclipse... which means that 2 different DLLs must be getting read, right? Or is there another explanation? I verified that C:\WINDOWS is the first folder on my path that contains a file called "jpcap.dll". >Do you have different versions of the jpcap library installed on your >system? This is possible, and seems the most likely explanation. So how can I figure out what DLL eclipse is loading, since that is obviously the correct one? Thanks for your help, cpp Someone else helped me solve this. Here are the results for posterity: The loadLibrary function look in the home directory, in the java -Djava.library.path variable and in the path. I have an old version of the DLL in java.library.path. DOH! Thanks for your help Gordon. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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