Spring连接池问题

Question

我没有Java和Spring方面的经验。我尝试编写一个使用JdbcTemplate进行数据访问的程序。我使用DBCP池，如下所示：

<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
    <property name="url" value="jdbc:oracle:thin:@192.168.2.7:1521:xe" />
    <property name="username" value="manifesto" />
    <property name="password" value="manifesto" />
    <property name="initialSize" value="2" />
    <property name="maxActive" value="4" />
</bean>

我的应用程序执行了几个更新操作，然后抛出一个异常：

    7053 [SenderThread-0] DEBUG org.springframework.jdbc.datasource.DataSourceUtils  - Fetching JDBC Connection from DataSource
Exception in thread "SenderThread-0" org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
The Connection descriptor used by the client was:
192.168.2.7:1521:xe
)
    at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:572)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:811)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:867)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:875)
    at org.springframework.jdbc.core.simple.SimpleJdbcTemplate.update(SimpleJdbcTemplate.java:249)
    at com.talutek.manifesto.dao.firestorm.dao.spring.MessageItemsTableDaoImpl.update(MessageItemsTableDaoImpl.java:52)
    at com.talutek.manifesto.lib.MessageItemMngr.updateItem(MessageItemMngr.java:115)
    at com.talutek.manifesto.gw.SenderThread.run(SenderThread.java:42)
    at java.lang.Thread.run(Thread.java:619)
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
The Connection descriptor used by the client was:
192.168.2.7:1521:xe
)
    at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
    at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
    at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
    ... 9 more
Caused by: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
The Connection descriptor used by the client was:
192.168.2.7:1521:xe

    at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:70)
    at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:110)
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:171)
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:496)
    at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:411)
    at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:490)
    at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:202)
    at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:33)
    at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:465)
    at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
    at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582)
    at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1556)
    at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1545)
    ... 13 more

当我更改池设置(池大小)时，应用程序可以再运行几次，但随后会崩溃。我认为这个问题与池化有关，但我无法解决它。

有什么建议吗？

Answer 1

当许多线程同时访问数据库时，同样的错误也会发生在我身上，并且我为每个线程都有一个单独的DBCP BasicDataSource和一个单独的Spring JdbcTemplate。

通过使BasicDataSource和JdbcTemplate成为所有线程共享的单例，我可以避免这个错误。这也是SpringSource推荐的。

Answer 2

谷歌搜索一下可能会有所帮助：http://www.dba-oracle.com/sf_ora_12519_tns_no_appropriate_service_handler_found.htm

一些建议:使用应用程序服务器池，如果可能，使用c3p0而不是DBCP

Answer 3

使用oracle.jdbc.pool.OracleDataSource