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我实现了 java web 服务，在其中，我有 DbUtil 类，我在线程中使用它来连接到 Oracle 数据库。问题是当我在 Tomcat 上部署 Web 服务时，它给了我关闭连接错误。

    1106] ERROR xac.atws.service - SQL exception, while inserting request to DB. EX :
java.sql.SQLRecoverableException: Closed Connection
    at oracle.jdbc.driver.PhysicalConnection.prepareCall(PhysicalConnection.java:3672)
    at oracle.jdbc.driver.PhysicalConnection.prepareCall(PhysicalConnection.java:3633)
    at xac.ape.at.ws.DbUtil.insertListMwRequestToDb(DbUtil.java:410)
    at xac.ape.at.ws.jaxb.list.AtListProcessor.run(AtListProcessor.java:34)
    at java.lang.Thread.run(Thread.java:745)

为了简要解释我在 DbUtil 类中所做的事情，我有公共类成员 conn、dbUser、dbPass、connectionUrl，它们由类构造函数填充。然后我使用这些变量在类的每个成员函数中打开和关闭一个新连接。dbUtil 类的实现图像附在链接中。DbUtil 类。

在每个成员函数中打开和关闭连接，如下所示： public DbUtil(String connectionUrlTemp, String dbUserTemp, String dbPassTemp) throws SQLException {

    try {
        //set the private connection variables
        dbUser = dbUserTemp;
        dbPass = dbPassTemp;
        connectionUrl = connectionUrlTemp;
        //initializing the connection
        OracleDataSource ods = new OracleDataSource();
        ods.setUser(dbUser);
        ods.setPassword(dbPass);
        ods.setURL(connectionUrl);
        conn = ods.getConnection();
        AtServiceImpl.loggerAtws.info("[SYSTEM] Successfully connected to DB");
        AtServiceImpl.loggerAtws.debug("[SYSTEM] DB Connection URL : {}", connectionUrl);
    } catch (SQLException e) {
        AtServiceImpl.loggerAtws.error("[SYSTEM] Exception occured while initializing DB connection. EX : ", e);
    }finally {
        if (conn != null) {
            conn.close();
        }
    }
}

public Hashtable<String, Integer> sysConfigPull(String systemName, String functionName) throws SQLException {
    Hashtable<String, Integer> sysConfig = new Hashtable<>();

    try {
        //---- added this section ----
        //initializing the connection
        OracleDataSource ods = new OracleDataSource();
        ods.setUser(dbUser);
        ods.setPassword(dbPass);
        ods.setURL(connectionUrl);
        conn = ods.getConnection();
        //---- end of added section ----

        CallableStatement sqlStatement;
        String SQLTEXT = "begin GETSYSCONFIG(?,?,?); end;";

        sqlStatement = conn.prepareCall(SQLTEXT);
        sqlStatement.setString(1, systemName);
        sqlStatement.setString(2, functionName);
        sqlStatement.registerOutParameter(3, OracleTypes.CURSOR);

        ResultSet rs;

        sqlStatement.executeUpdate();

        rs = (ResultSet)sqlStatement.getObject(3);

        while (rs.next()) {
            sysConfig.put("RETRYCOUNT", rs.getInt("RETRYCOUNT"));
            sysConfig.put("NOTICEID", rs.getInt("NOTICEID"));
            AtServiceImpl.loggerAtws.debug("System Config option: RETRYCOUNT {}, NOTICEID {}",rs.getString("RETRYCOUNT"), rs.getString("NOTICEID"));
        }

    } catch (SQLException e) {
        AtServiceImpl.loggerAtws.error("[SYSTEM] SQL Exception, load system configuration, EX:", e);
    }finally {
        if (conn != null) {
            conn.close();
        }
    }

    return sysConfig;
}

所以我认为在每个成员函数中打开和关闭连接可能会导致错误。如果是这样，为什么会这样？任何帮助，将不胜感激。

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