code: public void addClassLoader(final ClassLoader classLoader) {
          if (this.addedClassLoaders == null) {
              this.addedClassLoaders = new ArrayList<>();
          }
          if (classLoader != null) {
              this.addedClassLoaders.add(classLoader);
          }
      }
docs: Add a ClassLoader to the list of ClassLoaders to scan. (This only works if overrideClasspath() is not
  called.)
  
  @param classLoader
  The classloader to add.