@Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((extraHeaders == null) ? 0 : extraHeaders.hashCode()); result = prime * result + ((from == null) ? 0 : from.hashCode()); result = prime * result + ((id == null) ? 0 : id.hashCode()); result = prime * result + ((to == null) ? 0 : to.hashCode()); return result; }