[英]Configuring C3P0 in Persistence.xml with JPA and Hibernate
好吧,我试图用JPA + Hibernate + Spring第一次配置C3P0。 在persistence.xml中我有:
<properties>
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.format_sql" value="false" />
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.cache.use_second_level_cache"
value="false" />
<property name="hibernate.cache.use_query_cache" value="false" />
<property name="hibernate.jdbc.batch_size" value="50" />
<!-- Important -->
<property name="hibernate.connection.provider_class"
value="org.hibernate.connection.C3P0ConnectionProvider" />
<property name="hibernate.c3p0.max_size" value="20" />
<property name="hibernate.c3p0.min_size" value="5" />
<property name="hibernate.c3p0.acquire_increment" value="1" />
<property name="hibernate.c3p0.idle_test_period" value="3000" />
<property name="hibernate.c3p0.max_statements" value="50" />
<property name="hibernate.c3p0.timeout" value="300" />
</properties>
但是当我尝试初始化tomcat时,我收到以下错误:
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
... 58 more
50570 [Thread-4] ERROR org.hibernate.tool.hbm2ddl.SchemaUpdate - could not complete schema update
java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)
编辑1:
这是我的applicationContext.xml,我怎么能在里面配置C3P0?
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<!-- Seta anotaçoes para serem usadas pelo Spring -->
<context:annotation-config />
<!-- Define o pacote onde o Spring vai procurar por beans anotados -->
<context:component-scan base-package="br.com.myapp" />
<!-- define que as transaçoes irao ser anotadas -->
<tx:annotation-driven proxy-target-class="true" />
<!-- Configuracao do Banco de Dados -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.postgresql.Driver" />
<property name="url" value="jdbc:postgresql://localhost/mydatabase" />
<property name="username" value="postgres" />
<property name="password" value="pgadmin" />
</bean>
<!-- Configuracao do Hibernate -->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="senderPU" />
<property name="dataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="databasePlatform" value="org.hibernate.dialect.PostgreSQLDialect" />
<property name="showSql" value="true" />
</bean>
</property>
</bean>
<!-- Configuracao do gerente de transacoes do Spring -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
</beans>
您的配置存在缺陷。 您正在应用程序上下文中配置DataSource
。 所以基本上所有hibernate.c3po
属性是没有用的,旁边的的设置hibernate.connection.provider_class
财产伤了你的应用程序。 C3P0ConnectionProvider
需要C3P0连接,但是您使用的是基本的DriverManagerDataSource
。
我建议不要试图让hibernate管理池只需在你的applicationcontext中配置它。 用以下内容替换数据源定义
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<!-- Connection properties -->
<property name="driverClass" value="org.postgresql.Driver" />
<property name="jdbcUrl" value="jdbc:postgresql://localhost/mydatabase" />
<property name="user" value="postgres" />
<property name="password" value="pgadmin" />
<!-- Pool properties -->
<property name="minPoolSize" value="5" />
<property name="maxPoolSize" value="20" />
<property name="acquireIncrement" value="1" />
<property name="maxStatements" value="50" />
<property name="idleConnectionTestPeriod" value="3000" />
<property name="loginTimeout" value="300" />
</bean>
并从persistence.xml中删除hibernate.c3p0
和hibernate.connection.provider_class
。 将配置移动到Spring的优点是,您可以使用属性文件来包含属性,并将它们替换为PropertyPlaceHolderConfigurer
而不是将它们固定在persistence.xml中
基本上,您可以从persistence.xml中删除所有属性,并将它们移动到基于弹簧的配置。
2个其他非相关建议。 您可以删除<context:annotation-config />
<context:component-scan />
已隐含的<context:annotation-config />
<context:component-scan />
。 建议在标题中使用无版本的xsd文件,因此我建议删除这些版本。
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