public void checkinConnection(DBConnectionWrapper conn){
  if (conn == null)   return;
  conn.setCurrentStatement(null);
  conn.setInuse(false);
}

public void checkinConnection ( DBConnectionWrapper conn ) { if ( conn == null ) return ; conn . setCurrentStatement ( null ) ; conn . setInuse ( false ) ; }
well , the only thing we need do is to set inuse as false
