docs: protected synchronized void clear()
                      throws ObjectManagerException
      {
          final String methodName = "clear";
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.entry(this, cclass, methodName);
  
          super.clear();
          inMemoryManagedObjects = new ConcurrentHashMap(concurrency);
  
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.exit(this, cclass, "clear");
      }