private void eventReceived(EntryEvent event) {
      eventReceived = true;
      DistributedMember memberID = event.getDistributedMember();
      memberIDNotReceived = (memberID == null);
      // System.out.println("received event " + event);
    }
bug 35380: Cycling a DistributedSystem with an initialized pool causes interest registration
NPE

Test Scenario:

Create a DistributedSystem (DS1). Create a pool, initialize (creates a proxy with DS1 memberid)
Disconnect DS1. Create a DistributedSystem (DS2). Create a Region with pool, it attempts to
register interest using DS2 memberid, gets NPE.
geode-dunit/src/main/java/org/apache/geode/internal/cache/tier/sockets/ClientServerMiscDUnitTestBase.java