code: public synchronized void flush()
                      throws ObjectManagerException
      {
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled()) {
              trace.entry(this,
                          cclass,
                          "flush");
              trace.exit(this,
                         cclass,
                         "flush");
          }
      }
docs: For MemoryObjectstore there is nothing to do.
  
  @see com.ibm.ws.objectManager.ObjectStore#flush()