春季连接池问题 [英] Spring connection pooling issue

问题描述

我没有Java和Spring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，在这里是:

I'm not experienced in Java and Spring. I try to write a program that uses JdbcTemplate for Data access. I use DBCP pooling, here it is:

<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>

我的应用程序执行几次更新操作，然后引发异常:

My application perform several update operations and then throws an exception:

    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，该应用程序可以运行更多次，但随后崩溃.我认为问题与合并有关，但我无法解决.

When I change pool settings(pool size), the application can run some more times but it then crashes. I think the problem is related to pooling but I couldn't solve it.

有什么建议吗?

推荐答案

当许多线程同时访问数据库时，对我来说发生了同样的错误，并且我每个人都有一个单独的DBCP BasicDataSource和一个单独的Spring JdbcTemplate线程.

The same error occurred for me when lots of threads accessed the database simultaneously, and I had a separate DBCP BasicDataSource and a separate Spring JdbcTemplate for each thread.

通过将BasicDataSource和JdbcTemplate都设置为所有线程共享的单例，我可以避免此错误.这也是SpringSource的建议.

By making both the BasicDataSource and the JdbcTemplate a singleton shared by all threads, I could avoid this error. This is also what SpringSource recommends.

这篇关于春季连接池问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！