无法从java jdbc更新oracle sql数据库中的行，java代码卡在更新时

Question

我正面临一个问题，即对于Oracle SQL表中的一个特定记录（随机），更新和选择无法使用Java JDBC代码，java控件无限期地等待该更新语句（应用程序卡在那里）。我在底部附加了堆栈跟踪。这个程序几年来一直没有任何问题地执行。

码：

    public void updateRequestStatus(long req_id, int status){  
    int rowsAffected=0;
    Statement stmt = null;
    try{   
        stmt = objCon.createStatement();
        String strUpdQry="";
        '--- some java code
        '---
        strUpdQry= "UPDATE abcrequest SET status="+status+" where request_id="+req_id;
        this.logger.printString("Before executing Update Query :: with status: "+status+", Request id: "+req_id);

        rowsAffected=stmt.executeUpdate(strUpdQry);
        this.logger.printString("After executing Update Query:: "+status+", Request id: "+req_id);  
        this.objCon.commit();           
    }catch(SQLException sqle){
            this.lg.error("SQLException at :",sqle);
            this.logger.printString("SQLException occured  "+sqle.getMessage());
    }catch(Exception e){
            this.lg.error("Exception :",e);
            this.logger.printString("Exception occured in: "+e.getMessage());
    }       
    finally{
        closeStatement(stmt);
    }
}

我们尝试过的事情

1. 我们能够在同一记录上从oracle SQLDeveloper会话执行更新查询。
2. 当应用程序卡住时，我们验证了相关的表：V$LOCKED_OBJECT，v$LOCK，v$session_longops，dba_blockers，v$session，dba_waiters，用于查找表记录中的任何锁定，使java应用程序无限等待。但我们找不到任何东西。
3. 如果我们重新启动应用程序，即使是相同的记录更新或选择是冻结。如果我们跳过该记录，其他记录正在更新而没有任何问题。

导致这种情况的因素是什么？

堆栈跟踪

   java.lang.Thread.State: RUNNABLE
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.socketRead(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at oracle.net.ns.Packet.receive(Unknown Source)
    at oracle.net.ns.NetInputStream.getNextPacket(Unknown Source)
    at oracle.net.ns.NetInputStream.read(Unknown Source)
    at oracle.net.ns.NetInputStream.read(Unknown Source)
    at oracle.net.ns.NetInputStream.read(Unknown Source)
    at oracle.jdbc.ttc7.MAREngine.unmarshalUB1(MAREngine.java:931)
    at oracle.jdbc.ttc7.MAREngine.unmarshalSB1(MAREngine.java:893)
    at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:369)
    at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1891)
    at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteDescribe(TTC7Protocol.java:830)
    - locked <0x09c62c78> (a oracle.jdbc.ttc7.TTC7Protocol)
    at oracle.jdbc.driver.OracleStatement.doExecuteQuery(OracleStatement.java:2391)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2672)
    at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:572)
    - locked <0x04b068d8> (a oracle.jdbc.driver.OracleStatement)
    - locked <0x09c35338> (a oracle.jdbc.driver.OracleConnection)
    at xxxxx.DBActions.xxxxx.getRequestAttributes(Unknown Source)

Edit-1：添加了关于ojdbc6的新堆栈跟踪。

java.lang.Thread.State: RUNNABLE
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.socketRead(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at oracle.net.ns.Packet.receive(Packet.java:282)
    at oracle.net.ns.DataPacket.receive(DataPacket.java:103)
    at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:230)
    at oracle.net.ns.NetInputStream.read(NetInputStream.java:175)
    at oracle.net.ns.NetInputStream.read(NetInputStream.java:100)
    at oracle.net.ns.NetInputStream.read(NetInputStream.java:85)
    at oracle.jdbc.driver.T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:122)
    at oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:78)
    at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1179)
    at oracle.jdbc.driver.T4CMAREngine.unmarshalSB1(T4CMAREngine.java:1155)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:279)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:186)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:521)
    at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:194)
    at oracle.jdbc.driver.T4CStatement.executeForRows(T4CStatement.java:1000)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1307)
    at oracle.jdbc.driver.OracleStatement.executeUpdateInternal(OracleStatement.java:1814)
    at oracle.jdbc.driver.OracleStatement.executeUpdate(OracleStatement.java:1779)
    - locked <0x09ec40f0> (a oracle.jdbc.driver.T4CConnection)
    at oracle.jdbc.driver.OracleStatementWrapper.executeUpdate(OracleStatementWrapper.java:277)
    at cas.com.database.MQDatabaseDts.updateProvRequestStatus(MQDatabaseDts.java:595)
    at cas.com.thread.NeoMQSenderThread.run(NeoMQSenderThread.java:188)
    at java.lang.Thread.run(Unknown Source)

Answer 1

您应该在执行此语句之前调用objCon.isValid()，因为此问题看起来您的连接已断开连接。如果连接无效，请获取一个新连接。

Answer 2

上述问题是由于Oracle版本中的并发问题导致java会话被阻止。

在更新到实时的最新Oracle DB版本时，问题得以解决。