Method assertNull

src/main/java/graphql/Assert.java:79–85

(@Nullable T object, Supplier<String> msg)

    @Contract("!null,_ -> fail")
    public static <T> void assertNull(@Nullable T object, Supplier<String> msg) {
        if (object == null) {
            return;
        }
        throwAssert(msg.get());
    }

    @Contract("!null,_ -> fail")
    public static <T> void assertNull(@Nullable T object, String constantMsg) {