JDK 1.8 Doesn't Support PATCH. Here's how to "patch" it at Runtime as long as your security manager is disabled.

PatchJdk18.java

public class PatchJdk18 {

	public static void fixJdk18() {
		try {
			Field field = HttpURLConnection.class.getDeclaredField("methods");
			setFinalStatic(field, new String[] { "GET", "POST", "HEAD", "OPTIONS", "PUT", "DELETE", "TRACE", "PATCH", "KITTENS" });
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	private static void setFinalStatic(Field field, Object newValue) throws Exception {
		field.setAccessible(true);
		Field modifiersField = Field.class.getDeclaredField("modifiers");
		modifiersField.setAccessible(true);
		modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
		field.set(null, newValue);
		modifiersField.setInt(field, field.getModifiers() | Modifier.FINAL);
		modifiersField.setAccessible(false);
	}
}