Dynamically add jar files to classpath

    /**
     * Adds jar files to classpath.
     * @param file the folder for jar files.
     * @param classLoader the URLClassLoader
     * @throws IOException
     */
public void addCustomJars(File file, URLClassLoader classLoader) {
File[] jarFiles = file.listFiles();
if (jarFiles != null) {
if (logger.isDebugEnabled()) {
      URL[] urls = classLoader.getURLs();
      for (URL url : urls) {
      logger.debug("URL before custom jars are added:" + url.toString());
      }
}

   Class<?> sysclass = URLClassLoader.class;
    Method method = null;
try {
method = sysclass.getDeclaredMethod("addURL",parameters);
} catch (NoSuchMethodException e1) {
logger.error("Unable to find addURL method", e1);
return;
} catch (SecurityException e1) {
logger.error("Unable to get addURL method", e1);
return;
  }
    method.setAccessible(true);

    // add each jar file under such folder
for (File jarFile : jarFiles) {
if (jarFile.isFile() && jarFile.getName().endsWith("jar")) {
try {
             method.invoke(classLoader,new Object[]{ jarFile.toURI().toURL() });
} catch (Exception e) {
logger.error("Failed to add classpath for " + jarFile.getName(), e);;
}
}
}

if (logger.isDebugEnabled()) {
      URL[] urls = classLoader.getURLs();
      for (URL url : urls) {
        logger.debug("URL after custom jars are added:" + url.toString());
      }
}
}

In your main:

URLClassLoader classLoader = (URLClassLoader)Thread.currentThread().getContextClassLoader();
addCustomJars(new File("path_to_jar_files"), classLoader);