how to set LD_LIBRARY_PATH within the Java program?

Hi:

I need to set linux environment variable LD_LIBRARY_PATH within my Java program. The reason is that the Java program calls some linux program which dynamically links to other *.so files. I could do this on the terminal first:

export LD_LIBRARY_PATH=/fs/great/lib:${LD_LIBRARY_PATH}

For some reason, I don't want to do it this way. I want to do it within the Java program. I googled and saw this hacking way,

http://stackoverflow.com/questions/318239/how-do-i-set-environment-variables-from-java

People say it works great. But I don't understand his code, posted below. How to use it in my case. Thank you.

protected static void setEnv(Map<String, String> newenv)
{
  try
    {
        Class<?> processEnvironmentClass = Class.forName("java.lang.ProcessEnvironment");
        Field theEnvironmentField = processEnvironmentClass.getDeclaredField("theEnvironment");
        theEnvironmentField.setAccessible(true);
        Map<String, String> env = (Map<String, String>) theEnvironmentField.get(null);
        env.putAll(newenv);
        Field theCaseInsensitiveEnvironmentField = processEnvironmentClass.getDeclaredField("theCaseInsensitiveEnvironment");
        theCaseInsensitiveEnvironmentField.setAccessible(true);
        Map<String, String> cienv = (Map<String, String>) theCaseInsensitiveEnvironmentField.get(null);
        cienv.putAll(newenv);
    }
    catch (NoSuchFieldException e)
    {
      try {
        Class[] classes = Collections.class.getDeclaredClasses();
        Map<String, String> env = System.getenv();
        for(Class cl : classes) {
            if("java.util.Collections$UnmodifiableMap".equals(cl.getName())) {
                Field field = cl.getDeclaredField("m");
                field.setAccessible(true);
                Object obj = field.get(env);
                Map<String, String> map = (Map<String, String>) obj;
                map.clear();
                map.putAll(newenv);
            }
        }
      } catch (Exception e2) {
        e2.printStackTrace();
      }
    } catch (Exception e1) {
        e1.printStackTrace();
    }
}