[ mx4j-Bugs-1041478 ] Error in loading the dll using Mlet classloader

Bugs item #1041478, was opened at 2004-10-06 06:57
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=450647&aid=1041478&group_id=47745

Category: JMX implementation
Group: Release 2.0.1
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Error in loading the dll using Mlet classloader

Initial Comment:
I am trying to load a dll using System.loadLibrary() in an 
MBean loaded by MLet classloader. This works fine if the 
dll is put inside a jar file. But if I directly specify 
directory containing  the dll, the loadLibrary will throw 
the exception

java.lang.UnsatisfiedLinkError: C:\Program Files\HP 
OpenView\bin\OvSvcdPb.dll: %1 is not a valid Win32 
application 

And the dll I am trying to load is overwritten by 0 length 
file!!

This happens only when I am using the Mlet classloader. 
Things are fine with system classloader.

So I had a look into the Mlet.java source code and found 
the following code (in the copyLibrary()) bit confusing

         is = getResourceAsStream(library);
         if (is == null) return null;
         is = new BufferedInputStream(is);
         File file = new File(getLibraryDirectory(), library);
         if (file.exists()) file.delete();
         os = new BufferedOutputStream(new 
FileOutputStream(file));
         readFromAndWriteTo(is, os);
         os.close();
         is.close();
         return file.getCanonicalPath();

Here what is the need to delete the file, when it already 
exists?

First I thought this might be required in case the library 
is in a jar file, in which case before loading it needs be 
copied to some temporary location. I don't know much 
about this as I was not able to locate the complete flow.

But still I feel this might be the problem area since I am 
getting the exception only when the the dll is not in a 
jar file.


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