code: @Override
      public ItemStream findByStreamId(long itemStreamId) throws SevereMessageStoreException
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "findByIdInRoot", Long.valueOf(itemStreamId));
  
          ItemStream item = (ItemStream) _findById(itemStreamId);
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "findByIdInRoot", item);
          return item;
      }
docs: /*
  (non-Javadoc)
  
  @see com.ibm.ws.sib.msgstore.MessageStoreInterface#findByIdInRoot(long)