Program: 86626
Project: 86626
Buggy source:
@Override public void update(DataAccess data,String[] fieldNames,Object[] fieldValues) throws DatabaseWriteException {
  if (!this.doesEntryExist(data)) {
    return;
  }
  Connection conn=pool.getConnectionFromPool();
  ResultSet rs=null;
  try {
    rs=this.getResultSet(conn,data,fieldNames,fieldValues,true);
    if (rs != null) {
      if (rs.next()) {
        HashMap<Column,Object> columns=data.toDatabaseEntryList();
        Iterator<Column> it=columns.keySet().iterator();
        Column column=null;
        while (it.hasNext()) {
          column=it.next();
          if (column.isList()) {
            rs.updateObject(column.columnName(),this.getString((List<?>)columns.get(column)));
          }
 else {
            rs.updateObject(column.columnName(),columns.get(column));
          }
        }
        rs.updateRow();
      }
 else {
        throw new DatabaseWriteException("String_Node_Str" + data.toString());
      }
    }
  }
 catch (  SQLException ex) {
    Canary.logStacktrace(ex.getMessage(),ex);
  }
catch (  DatabaseTableInconsistencyException dtie) {
    Canary.logStacktrace(dtie.getMessage(),dtie);
  }
catch (  DatabaseReadException ex) {
    Logger.getLogger(MySQLDatabase.class.getName()).log(Level.SEVERE,null,ex);
  }
 finally {
    try {
      PreparedStatement st=rs.getStatement() instanceof PreparedStatement ? (PreparedStatement)rs.getStatement() : null;
      this.closeRS(rs);
      this.closePS(st);
      pool.returnConnectionToPool(conn);
    }
 catch (    SQLException ex) {
      Canary.logStacktrace(ex.getMessage(),ex);
    }
  }
}

Fixed version (ground truth):
@Override public void update(DataAccess data,String[] fieldNames,Object[] fieldValues) throws DatabaseWriteException {
  if (!this.doesEntryExist(data)) {
    return;
  }
  Connection conn=pool.getConnectionFromPool();
  ResultSet rs=null;
  try {
    rs=this.getResultSet(conn,data,fieldNames,fieldValues,true);
    if (rs != null) {
      if (rs.next()) {
        HashMap<Column,Object> columns=data.toDatabaseEntryList();
        Iterator<Column> it=columns.keySet().iterator();
        Column column;
        while (it.hasNext()) {
          column=it.next();
          if (column.isList()) {
            rs.updateObject(column.columnName(),this.getString((List<?>)columns.get(column)));
          }
 else {
            rs.updateObject(column.columnName(),columns.get(column));
          }
        }
        rs.updateRow();
      }
 else {
        throw new DatabaseWriteException("String_Node_Str" + data.toString());
      }
    }
  }
 catch (  SQLException ex) {
    Canary.logStacktrace(ex.getMessage(),ex);
  }
catch (  DatabaseTableInconsistencyException dtie) {
    Canary.logStacktrace(dtie.getMessage(),dtie);
  }
catch (  DatabaseReadException ex) {
    Logger.getLogger(MySQLDatabase.class.getName()).log(Level.SEVERE,null,ex);
  }
 finally {
    try {
      PreparedStatement st=rs != null && rs.getStatement() instanceof PreparedStatement ? (PreparedStatement)rs.getStatement() : null;
      this.closeRS(rs);
      this.closePS(st);
      pool.returnConnectionToPool(conn);
    }
 catch (    SQLException ex) {
      Canary.logStacktrace(ex.getMessage(),ex);
    }
  }
}