Update code checks both non-null and instance of a class in jdk.hotspot.agent module classes.
The checks and explicit casts could also be replaced with pattern matching for the instanceof operator.
For example:
    The following code:

    if ((obj != null) && (obj instanceof TCPEndpoint)) {
        TCPEndpoint ep = (TCPEndpoint) obj;
        if (port != ep.port || !host.equals(ep.host))

    Can be simplified to:

    if (obj instanceof TCPEndpoint ep) {
        if (port != ep.port || !host.equals(ep.host))