Calling disconnect on MulticastTransport causes "SocketException" stack trace

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.X EE, 6.2.X EE, 7.0.0 M4
• Fix Version/s: 6.1.X EE, 6.2.3 CE GA4, 6.2.X EE, 7.0.0 M4
• Component/s: Fault Tolerance, Fault Tolerance > Clustering Framework
• Labels:
  • liferay-fixpack-portal-34-6130
  • liferay-fixpack-portal-40-6210
• Branch Version/s:
  6.2.x, 6.1.x
• Backported to Branch:
  Committed
• Story Points: 12
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/23402

Steps to reproduce:

1. Navigate to the Scripting Console in the Control Panel and switch the "Language" to Groovy.
2. Paste the following content into the Script field.

import com.liferay.util.transport.MulticastDatagramHandler;
import com.liferay.util.transport.MulticastTransport;

datagramHandler = new MulticastDatagramHandler(false, false);
transport = new MulticastTransport(datagramHandler, "239.255.0.5", 23305);

transport.connect();
Thread.sleep(5000);
transport.disconnect();

Expected behavior is that no stack trace is printed to the console. Actual behavior is that a stack trace is printed to the console.

00:30:38,604 ERROR [MulticastListener-239.255.0.523305][MulticastTransport:206] Unable to process 
java.net.SocketException: Socket closed
	at java.net.PlainDatagramSocketImpl.receive0(Native Method)
	at java.net.AbstractPlainDatagramSocketImpl.receive(AbstractPlainDatagramSocketImpl.java:145)
	at java.net.DatagramSocket.receive(DatagramSocket.java:786)
	at com.liferay.util.transport.MulticastTransport.run(MulticastTransport.java:95)
00:30:38,604 ERROR [MulticastListener-239.255.0.523305][MulticastDatagramHandler:206] java.net.SocketException: Socket closed
java.net.SocketException: Socket closed
	at java.net.PlainDatagramSocketImpl.receive0(Native Method)
	at java.net.AbstractPlainDatagramSocketImpl.receive(AbstractPlainDatagramSocketImpl.java:145)
	at java.net.DatagramSocket.receive(DatagramSocket.java:786)
	at com.liferay.util.transport.MulticastTransport.run(MulticastTransport.java:95)