[jboss-as7-dev] In JBoss AS 7, got an error of Native Library xxx already loaded in another classloader

[Tom Fonteyne]

native libs should only be loaded once in an entire JVM (but you 
probably knew this).

How about creating a module wrapping that lib ? The module could then 
have a single class with a static block loading the lib.

Kind regards
Tom


On 05/11/2012 04:47 PM, M. Steven wrote:
> Hi,
>
> I am working on migrating an App from JBoss 4.2.3 to JBoss AS 7.1.1.  
> Now I am facing a problem says "Native Library xxx already loaded in 
> another classloader".
> To be specific: Here are the errors:
> 11:22:17,854 ERROR [stderr] (http--127.0.0.1-80-4) Caused by: 
> java.lang.UnsatisfiedLinkError: Native Library 
> E:\programs\jdk1.6.0_29\jre\bin\jpeg.dll already loaded in another 
> classloader
> 11:22:17,855 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1772)
> 11:22:17,856 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> java.lang.ClassLoader.loadLibrary(ClassLoader.java:1724)
> 11:22:17,856 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> java.lang.Runtime.loadLibrary0(Runtime.java:823)
> 11:22:17,857 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> java.lang.System.loadLibrary(System.java:1028)
> 11:22:17,857 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> sun.security.action.LoadLibraryAction.run(Unknown Source)
> 11:22:17,858 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> java.security.AccessController.doPrivileged(Native Method)
> 11:22:17,859 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> sun.awt.image.codec.JPEGImageDecoderImpl.<clinit>(Unknown Source)
> 11:22:17,859 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> com.sun.image.codec.jpeg.JPEGCodec.createJPEGDecoder(Unknown Source)
> 11:22:17,860 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> com.sun.media.jai.codecimpl.JPEGImage.<init>(JPEGImageDecoder.java:106)
> 11:22:17,861 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> com.sun.media.jai.codecimpl.JPEGImageDecoder.decodeAsRenderedImage(JPEGImageDecoder.java:46)
> 11:22:17,862 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> com.sun.media.jai.opimage.CodecRIFUtil.create(CodecRIFUtil.java:88)
> 11:22:17,865 ERROR [stderr] (http--127.0.0.1-80-4)     at 
> com.sun.media.jai.opimage.JPEGRIF.create(JPEGRIF.java:43)
> 11:22:17,867 ERROR [stderr] (http--127.0.0.1-80-4)     ... 114 more
>
> The same App runs well under JBoss 4.2.3.  I am wondering if the error 
> is caused by the Modularized class loading in JBoss AS7?
>
> Could someone please give me some advices on how to resolve the problem?
>
> Thanks a lot in advance.
>
> Regards,
>
> Michael
>
>
>
>
>
>
>
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-- 
Tom Fonteyne
Red Hat - UK
EMEA GSS-SEG-Middleware

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