DnsResolverUtil "Cannot get DNS TTL settings from sun.net.InetAddressCachePolicy class" in Java 17

[lhotari]

Describe the bug

DnsResolverUtil fails to get existing DNS TTL settings. This happens in Java 17. Error message:

WARN  org.apache.pulsar.common.util.netty.DnsResolverUtil - Cannot get DNS TTL settings from sun.net.InetAddressCachePolicy class
  java.lang.IllegalAccessException: class org.apache.pulsar.common.util.netty.DnsResolverUtil cannot access class sun.net.InetAddressCachePolicy (in module java.base) because module java.base does not export sun.net to unnamed module @3932c79a
  	at jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:392) ~[?:?]
  	at java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:674) ~[?:?]
  	at java.lang.reflect.Method.invoke(Method.java:560) ~[?:?]
  	at org.apache.pulsar.common.util.netty.DnsResolverUtil.<clinit>(DnsResolverUtil.java:46) ~[org.apache.pulsar-pulsar-common-2.11.0-SNAPSHOT.jar:2.11.0-SNAPSHOT]
  	at org.apache.pulsar.client.impl.ConnectionPool.createDnsNameResolver(ConnectionPool.java:116) ~[org.apache.pulsar-pulsar-client-original-2.11.0-SNAPSHOT.jar:2.11.0-SNAPSHOT]

To Reproduce

Use Pulsar Java Client in Java 17

Expected behavior

Pulsar Java Client should be able to detect DNS TTL settings used in Java and apply them to Netty's DnsNameResolverBuilder.

Additional context
#15219

[Technoboy-]

I only know to add vm options --add-opens=java.management/sun.management=ALL-UNNAMED --add-opens=java.base/sun.net=ALL-UNNAMED could solve the issue

[lgxbslgx]

@lhotari @Technoboy- Have you started the work locally? If not, I would like to take it over.