public void setLibraryClassLoader(URLClassLoader libraryClassLoader) {
    this.libraryClassLoader = libraryClassLoader;
  }
Sets the {@link ClassLoader} that can be used to load classes found in JARs
in the stack's library folder.

@param libraryClassLoader
         the class loader.
ambari-server/src/main/java/org/apache/ambari/server/state/StackInfo.java