void clear() {
    if (validate) {
      return; // can't do clear and validate
    }

    try {
      region1.clear();
    } catch (Exception e) {
      exceptionOccurredInClears = true;
      logWriter.severe("Exception occurred in clear=", e);
      throw new AssertionError("Exception occurred in clear", e);
    }
  }
Tests the bug where a get operation on an evicted entry fails to get value as the oplog is
deleted by the roller, but the entry was not rolled.
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/ConcurrentRegionOperationsJUnitTest.java