static void putForClient() {
    Cache cache = new ClientServerMiscDUnitTestBase().getCache();
    Region r2 = cache.getRegion(SEPARATOR + REGION_NAME2);
    if (r2 == null) {
      r2 = cache.createRegionFactory(RegionShortcut.REPLICATE).create(REGION_NAME2);
    }

    r2.put(k1, "client2_k1");
    r2.put(k2, "client2_k2");
  }
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