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    <p><strong>The idea is to make the static field "sys_paths" null</strong> so that it would construct the paths from the changed value. See the post here (Post#223 by AjaySingh516) <a href="http://forums.sun.com/thread.jspa?messageID=3744346#3744346" rel="nofollow noreferrer">http://forums.sun.com/thread.jspa?messageID=3744346#3744346</a></p> <pre><code>Class clazz = ClassLoader.class; Field field = clazz.getDeclaredField("sys_paths"); boolean accessible = field.isAccessible(); if (!accessible) field.setAccessible(true); Object original = field.get(clazz); // Reset it to null so that whenever "System.loadLibrary" is called, it // will be reconstructed with the changed value. field.set(clazz, null); try { // Change the value and load the library. System.setProperty("java.library.path", "./libs/"); System.loadLibrary("mylibapr"); } finally { // Revert back the changes. field.set(clazz, original); field.setAccessible(accessible); } </code></pre> <p>.</p> <p><strong>gcj System Properties</strong> (See: Standard properties supported by libgcj)</p> <p><a href="http://gcc.gnu.org/onlinedocs/gcj/System-properties.html" rel="nofollow noreferrer">http://gcc.gnu.org/onlinedocs/gcj/System-properties.html</a> </p> <p>.</p> <p><strong>Solution#2</strong> : Set System environment variable at compile time</p> <p><a href="http://linux.die.net/man/1/gcj" rel="nofollow noreferrer">http://linux.die.net/man/1/gcj</a></p> <p>For this you have to use parameter <code>-Djava.library.path=./libs/</code> with <code>gcj</code> </p> <p><strong>From gcj manual (above link):</strong></p> <p><strong>--main= CLASSNAME</strong></p> <p>This option is used when linking to specify the name of the class whose "main" method should be invoked when the resulting executable is run. </p> <p><strong>-Dname[=value]</strong></p> <p>This option can only be used with "--main". It defines a system property named name with value value. If value is not specified then it defaults to the empty string. <strong>These system properties are initialized at the program's startup and can be retrieved at runtime</strong> using the "java.lang.System.getProperty" method. </p> <p>I have never worked with gcj but as per docs these system properties can be retrieved at runtime, hence it will be portable to other systems as well.</p> <p>Also see: <a href="http://gcc.gnu.org/wiki/Statically_linking_libgcj?action=show&amp;redirect=Statically+linking+libgcj" rel="nofollow noreferrer">http://gcc.gnu.org/wiki/Statically_linking_libgcj?action=show&amp;redirect=Statically+linking+libgcj</a></p>
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    1. USGladwin Burboz
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    1. COYou can have "./libs/" and "mylibapr" passed in as command line parameter.
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    2. COThis seems very promising; I'll take a look tomorrow morning!
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      1. USPaul Lammertsma
    3. CO@Paul: Want to keep you informed that this solution may be JVM specific and hence won't be super portable. Here we are playing with private variable of class ClassLoader. This Open JDK ClassLoader source code has it "http://www.docjar.com/html/api/java/lang/ClassLoader.java.html"
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