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的persistence.xml如何在JPA/Hibernate應用程序中配置連接池（無Spring）？
<properties>
<property name='javax.persistence.jdbc.driver' value='org.postgresql.Driver' />
<property name='javax.persistence.jdbc.url'
value='jdbc:postgresql://192.168.19.66:5432/service1' />
<property name='javax.persistence.jdbc.user' value='postgres' />
<property name='javax.persistence.jdbc.password' value='root' />
<property name='hibernate.dialect' value='org.hibernate.dialect.PostgreSQLDialect' />
<property name='hibernate.connection.shutdown' value='true' />
<property name='hibernate.hbm2ddl.auto' value='none' />
<property name='hibernate.show_sql' value='false' />
<property name='hibernate.format_sql' value='false' />
<!-- Connection Pooling -->
<property name="hibernate.connection.provider_class"
value="org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider" />
<property name="hibernate.c3p0.max_size" value="100" />
<property name="hibernate.c3p0.min_size" value="5" />
<property name="hibernate.c3p0.acquire_increment" value="5" />
<property name="hibernate.c3p0.idle_test_period" value="500" />
<property name="hibernate.c3p0.max_statements" value="50" />
<property name="hibernate.c3p0.timeout" value="10000" />
</properties>
異常
[C3P0PooledConnectionPoolManager[identityToken->1hge4qw8wh4gndjoawud4|b81be4]-AdminTaskTimer] DEBUG com.mchange.v2.async.ThreadPoolAsynchronousRunner - com[email protected]5d1aef -- Running DeadlockDetector[Exiting. No pending tasks.]
[C3P0PooledConnectionPoolManager[identityToken->1hge4qw8wh4gndjoawud4|b81be4]-AdminTaskTimer] DEBUG com.mchange.v2.resourcepool.BasicResourcePool - Continuing acquisition series. pending_acquires [5], attempts_remaining: 20
[C3P0PooledConnectionPoolManager[identityToken->1hge4qw8wh4gndjoawud4|b81be4]-AdminTaskTimer] DEBUG com.mchange.v2.async.ThreadPoolAsynchronousRunner - [email protected]: Adding task to queue -- com[email protected]934847
[C3P0PooledConnectionPoolManager[identityToken->1hge4qw8wh4gndjoawud4|b81be4]-HelperThread-#0] DEBUG com.mchange.v2.resourcepool.BasicResourcePool - An exception occurred while acquiring a poolable resource. Will retry.
java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getDriver(DriverManager.java:264)
at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:240)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:146)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:195)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:184)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:200)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1086)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1073)
at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1810)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:648)
獲取例外值java.sql.SQLException：沒有合適的驅動程序。
當我查看源代碼時，它正在尋找屬性「hibernate.connection.driver_class」。我已經在「javax.persistence.jdbc.driver」中提到了驅動程序類。
我想我沒有做正確的方式來配置連接池。該應用程序使用hibernate 4.1.11（不含spring），JPA2，Postgresql 9.1。沒有hibernate.cfg.xml。
問題
- 哪些是休眠/ JPA應用程序配置連接池的方式。
- 我已經在javax.persistence.jdbc.driver中提供了嗎？如果我提供
hibernate.connection.driver_class屬性，連接池和JPA連接創建的連接是相同還是不同？
注意
- PostgreSQL驅動在類路徑中。
- 如果我在
<!-- Connection Pooling -->之後刪除行，它會運行。但是，如果我在連接池之後添加<!-- Connection Pooling -->行，我得到這個異常。
是PostgreSQL驅動在類路徑後？ –
是的。如果我在<！ - Connection Pooling - >之後刪除行。它運行。但是，如果我在<！ - 連接池 - >連接池之後添加行。我得到這個例外。 – Shashi
設置hibernate.connection.driver_class屬性有什麼問題？ –