Setting Djava.library.path programmatically (or alternatives)?

Question

I am looking to set the VM argument Djava.library.path programmatically. If this can't be done, what are the alternatives (if there are any)?

Answer 1

The solution is easy with this method:

public static void addLibraryPath(String pathToAdd) throws Exception {
    Field usrPathsField = ClassLoader.class.getDeclaredField("usr_paths");
    usrPathsField.setAccessible(true);

    String[] paths = (String[]) usrPathsField.get(null);

    for (String path : paths)
        if (path.equals(pathToAdd))
            return;

    String[] newPaths = Arrays.copyOf(paths, paths.length + 1);
    newPaths[newPaths.length - 1] = pathToAdd;
    usrPathsField.set(null, newPaths);
}

Answer 2

take a look at this java doc http://docs.oracle.com/javase/6/docs/api/java/lang/System.html#setProperty(java.lang.String, java.lang.String)

you want to call the setProperty(String, String) method.

so it would look something like this in your case

System.setProperty("java.library.path","value_you_want");