Added synchronize block

gclc/src/main/java/net/bigeon/gclc/utils/ReadingRunnable.java

@@ -200,7 +200,9 @@ public final class ReadingRunnable implements Runnable {
      */
     private void doWaitMessage(final long timeout) throws IOException {
         try {
+            synchronized (lock) {
                 lock.wait(timeout);
+            }
         } catch (final InterruptedException e) {
             LOGGER.log(Level.SEVERE, THREAD_INTERRUPTION_EXCEPTION, e);
             Thread.currentThread().interrupt();