code: protected void registerKnownJdkImmutableClasses() {
          registerImmutable(String.class);
          registerImmutable(Integer.class);
          registerImmutable(Long.class);
          registerImmutable(Boolean.class);
          registerImmutable(Class.class);
          registerImmutable(Float.class);
          registerImmutable(Double.class);
          registerImmutable(Character.class);
          registerImmutable(Byte.class);
          registerImmutable(Short.class);
          registerImmutable(Void.class);
  
          registerImmutable(BigDecimal.class);
          registerImmutable(BigInteger.class);
          registerImmutable(URI.class);
          registerImmutable(URL.class);
          registerImmutable(UUID.class);
          registerImmutable(Pattern.class);
      }
docs: registers some known JDK immutable classes. Override this to register your own list of jdk's immutable classes