jdbc - 无法从 PoolingDataSource 的池中获取连接

Question

这个生产问题现在占据了我的头。我已将 Bitronix 配置为使用 jBPM5 工具作为事务管理器。它在很长一段时间内工作正常，但突然开始出现以下异常情况。

异常堆栈跟踪

Caused by: java.sql.SQLException: unable to get a connection from pool of a PoolingDataSource containing an XAPool of resource jdbc/jbpm-ds with 1 connection(s) (1 still available)
    at bitronix.tm.resource.jdbc.PoolingDataSource.getConnection(PoolingDataSource.java:262)
    at org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.getConnection(InjectedDataSourceConnectionProvider.java:71)
    at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
    ... 78 more
Caused by: bitronix.tm.internal.BitronixRuntimeException: cannot get valid connection from an XAPool of resource jdbc/jbpm-ds with 1 connection(s) (1 still available) after trying for 30s
    at bitronix.tm.resource.common.XAPool.getConnectionHandle(XAPool.java:160)
    at bitronix.tm.resource.common.XAPool.getConnectionHandle(XAPool.java:91)
    at bitronix.tm.resource.jdbc.PoolingDataSource.getConnection(PoolingDataSource.java:258)
    ... 80 more
Caused by: java.sql.SQLRecoverableException: IO Error: Connection timed out
    at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:899)
    at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1175)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1296)
    at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3613)
    at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3657)
    at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1495)
    at bitronix.tm.resource.jdbc.JdbcPooledConnection.testConnection(JdbcPooledConnection.java:215)
    at bitronix.tm.resource.jdbc.JdbcPooledConnection.getConnectionHandle(JdbcPooledConnection.java:299)
    at bitronix.tm.resource.common.XAPool.getConnectionHandle(XAPool.java:130)
    ... 82 more
Caused by: java.net.SocketException: Connection timed out
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.read(SocketInputStream.java:150)
    at java.net.SocketInputStream.read(SocketInputStream.java:121)
    at oracle.net.ns.Packet.receive(Packet.java:308)
    at oracle.net.ns.DataPacket.receive(DataPacket.java:106)
    at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:324)
    at oracle.net.ns.NetInputStream.read(NetInputStream.java:268)
    at oracle.net.ns.NetInputStream.read(NetInputStream.java:190)
    at oracle.net.ns.NetInputStream.read(NetInputStream.java:107)
    at oracle.jdbc.driver.T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:124)
    at oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:80)
    at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1137)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:350)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:208)
    at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:886)
    ... 90 more

奇怪的是，应用程序在 XAPool 中有足够数量的 XA 连接可用。它接受连接，尝试连接，无法连接，只是丢弃连接并使用新连接进行处理。

SEVERE: unable to get a connection from pool of a PoolingDataSource containing an XAPool of resource jdbc/jbpm-ds with 9 connection(s) (9 still available)

SEVERE: unable to get a connection from pool of a PoolingDataSource containing an XAPool of resource jdbc/jbpm-ds with 8 connection(s) (8 still available)

SEVERE: unable to get a connection from pool of a PoolingDataSource containing an XAPool of resource jdbc/jbpm-ds with 7 connection(s) (7 still available)

任何人都可以从这个问题中解脱出来吗？

更新1:

经过一些尝试，我能够在本地重现同样的问题。一旦数据库连接被重置或我的应用程序和数据库之间的网络连接丢失，PoolingDataSource(由 Bitronix 提供)池中的池连接将变得无效。我的问题是为什么它无法自动恢复？有什么原因可以让我们自动恢复或建立新的连接？

我正在使用 btm 版本 2.1.4。

谢谢，马亚克

Answer 1

我遇到了同样的问题，但这是由于用户权限所致。我的用户没有足够的权限，所以我遇到了这个问题。之后，我运行了下面提到的这 3 个命令来创建一个新用户，它对我有用。我希望，它可以帮助某人。

1. 创建用户 'newuser'@'localhost' 由 'password' 标识；
2. 授予 * 上的所有权限。 * 到 'newuser'@'localhost';
3. 刷新权限；