public ProxyBuilder<T> parentClassLoader(ClassLoader parent) {
    parentClassLoader = parent;
    return this;
  }
Specifies the parent ClassLoader to use when creating the proxy.

<p>If null, {@code ProxyBuilder.class.getClassLoader()} will be used.
android/android_framework/dex-maker/src/main/java/com/android/dx/stock/ProxyBuilder.java