code: public static void setInstance(final RuntimeDelegate delegate) {
  		SecurityManager security = getSecurityManager();
  		if (security != null) {
  			security.checkPermission(SUPPRESS_ACCESS_CHECKS_PERMISSION);
  		}
  		synchronized(RuntimeDelegate.CACHED_DELEGATE) {
  			RuntimeDelegate.CACHED_DELEGATE.set(delegate);
  		}
  	}
docs: Set the {@code RuntimeDelegate} that will be used by clients. If this method
  is not called prior to {@link RuntimeDelegate#getInstance()} then an
  implementation will be sought as described in
  {@link RuntimeDelegate#getInstance()}.
  
  @param delegate
  the {@code RuntimeDelegate} runtime delegate instance.
  @throws SecurityException
  if there is a security manager and the permission
  ReflectPermission("suppressAccessChecks") has not been
  granted.