Expected behavior

The hashCode methods should return the same result for objects which are considered equal, according to equals.

Actual behavior

The hashCode methods return different results.
The reason is that they call super.hashCode, which is actually Object.hashCode, and therefore differs between instances.

For DefaultHttp2PingFrame a possible solution (which would also include the content field) could look like this:

public int hashCode() {
    return Boolean.hashCode(ack) * 31 + Long.hashCode(content);
}

Steps to reproduce

see reproducer code below

Minimal yet complete reproducer code (or URL to code)

• AbstractHttp2StreamFrame:

  // For simplicity create a dummy subclass here, but can also be seen with the other subclasses
  class C extends AbstractHttp2StreamFrame {
      // Doesn't matter
      @Override public String name() {
          return null;
      }
  }
  
  Object o1 = new C();
  Object o2 = new C();
  
  // This works
  System.out.println("Equals: " + o1.equals(o2));
  // This doesn't work; prints different hashCode values
  System.out.println("hashCode:\n  o1: " + o1.hashCode() + "\n  o2: " + o2.hashCode());

• DefaultHttp2PingFrame:

  Object o1 = new DefaultHttp2PingFrame(1, true);
  Object o2 = new DefaultHttp2PingFrame(1, true);
  
  // This works
  System.out.println("Equals: " + o1.equals(o2));
  // This doesn't work; prints different hashCode values
  System.out.println("hashCode:\n  o1: " + o1.hashCode() + "\n  o2: " + o2.hashCode());

Netty version

4.1.100.Final

JVM version (e.g. java -version)

Java 17

OS version (e.g. uname -a)

Windows 10