docs: public int prepare(Xid xid) throws XAException
     {
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "prepare", xid);
  
        final int result = internalPrepare(xid);
        
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "prepare", ""+result);
        return result;
     }