Why overwriting "java.library.path" doesn't work?

[D Rog]

My code dynamically resolves native libraries location, however I can't use System.load("complete path") because the libraries are loaded in 3rd party Java code. So if I even preload libraries, 3rd party code fails with
unsatisfied link error.
An attempt to overwrite "java.library.path" doesn't work either.

  System.setProperty("java.library.path", "path to dll directory");

I looked in System.setProperty and java.lang.ClassLoader.loadLibrary source and didn't find an answer. Yes, after every reload properties, class System does native call to initialize default values, however it doesn't happen for setProperty call. loadLibrary doesn't do any magic either, it does read property from System and trying to locate native libraries. So where is the magic? I do not want to debug java.lang package, hoping that somebody knows a solution here.

[Jesper de Jong]

Specify it on the command line with the -D option when you run your Java program:

java -Djava.library.path=<path to DLL dir> com.mypackage.MyMainClass

[Rob Spoor]

Perhaps java.net.URLClassLoader can help you.

[Peter Chase]

Originally posted by D Rog:
So if I even preload libraries, 3rd party code fails with
unsatisfied link error.

If you are loading your native libraries via native code, you can register the functions that support Java native methods using JNI RegisterNatives() function.