我在 Java 和 Spring 方面没有经验。我尝试编写一个使用 JdbcTemplate 进行数据访问的程序。我使用 DBCP 池，这里是：
<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，应用程序可以运行更多次，但随后崩溃。我认为问题与池有关，但我无法解决。
有什么建议么？