public static void processException() {
    try {
      pool.processException(new IOException(), conn1);
    } catch (Exception ex) {
      throw new RuntimeException("Exception while setting processException  ", ex);
    }
  }
put on non interest list ep and verify updates
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/InterestListEndpointDUnitTest.java