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Thread: UnsatisfiedLinkError from Matlab code

  1. #1
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    Default UnsatisfiedLinkError from Matlab code

    EDIT: Nevermind, fixed the problem. Matlab needed an additional file in it's bin directory to point to the java libraries. Mod can delete this message if it's not useful.


    Hi All,

    I'm trying to interface a spectrometer (Ocean Optics USB2000+) with matlab via a wrapper that calls java libraries. The java methods and the wrapper class seem to load into matlab fine, but when I try to send a command to the spectrometer it gives me the following error:

    ??? Java exception occurred:
    java.lang.UnsatisfiedLinkError: no NatUSB 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.oceanoptics.uniusb.UniUSB.<clinit>(UniUSB.java :56)

    at com.oceanoptics.omnidriver.features.USBImpl.<init> (USBImpl.java:62)

    at
    com.oceanoptics.omnidriver.spectrometer.USBSpectro meter.<init>(USBSpectrometer.java:96)

    at
    com.oceanoptics.omnidriver.spectrometer.mayapro200 0.MayaPro2000.<init>(MayaPro2000.java:167)

    at sun.reflect.NativeConstructorAccessorImpl.newInsta nce0(Native Method)

    at sun.reflect.NativeConstructorAccessorImpl.newInsta nce(Unknown Source)

    at sun.reflect.DelegatingConstructorAccessorImpl.newI nstance(Unknown Source)

    at java.lang.reflect.Constructor.newInstance(Unknown Source)

    at java.lang.Class.newInstance0(Unknown Source)

    at java.lang.Class.newInstance(Unknown Source)

    at
    com.oceanoptics.omnidriver.spectrometer.Spectromet erFactory.getAllSpectrometers(SpectrometerFactory. java:193)

    at
    com.oceanoptics.omnidriver.api.wrapper.Wrapper.ope nAllSpectrometers(Wrapper.java:501)


    I suppose that this means java can't find the library 'NatUSB.dll', but I have confirmed that this dll exists and that the PATH environment variable has a pointer to the directory where it is located. What else might have gone wrong here?

    Thanks!
    Last edited by RandalF; August 17th, 2011 at 07:20 PM.


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    Default Re: UnsatisfiedLinkError from Matlab code

    EDIT: Found it, NatUSB.dll should be in bin\win32
    this self-fixing thread might be closed

    Hi RandalF,

    I'm facing the same exception when trying to interface with an Ocean Optics HR4000 with Matlab. Could you tell me which additional file Matlab needs and where is should be saved?

    Thank in advance!
    Last edited by EvB; August 18th, 2011 at 02:40 AM.

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    Default Re: UnsatisfiedLinkError from Matlab code

    Hi EvB,

    I see that you fixed it, but just for the benefit of anyone who comes along this thread, I added a file, librarypath.txt in Matlab's startup directory with a pointer to the directory where the Omnidriver DLLs are located. This is discussed under "Locating Native Method Libraries" here: Bringing Java Classes and Methods into MATLAB Workspace :: Using Java Libraries from MATLAB (MATLAB)

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