Question

我实现了Java Web Service，并且在其中实现了DbUtil类，该类正在线程中用于连接到Oracle数据库。问题是，当我在Tomcat上部署Web服务时，它给了我Closed Connection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)

要简要说明我在DbUtil类中所做的工作，是我有由类构造函数填充的公共类成员conn，dbUser，dbPass，connectionUrl。然后，我使用这些变量在类的每个成员函数中打开和关闭新连接。链接中附加了dbUtil类的实现图像。 DbUtil class。

在每个成员函数中打开和关闭连接，如下所示：公共DbUtil（String connectionUrlTemp，String dbUserTemp，String dbPassTemp）引发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，为什么会这样呢？任何帮助将不胜感激。

Java Web服务数据库连接

0 个答案: