使用Spring，Hibernate，JPA和C3P0的数据库连接异常

Question

I'm trying to configure my app to use C3P0 datasource (I can't use the datasource provided by the container).

But, when my app is starting, an exception has occurred:

The user must supply a JDBC connection

Bellow is my config files:

spring-config.xml:

<bean id="pum" class="org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager">
    <property name="persistenceXmlLocations">
        <list>
            <value>classpath*:META-INF/persistence.xml</value>
        </list>
    </property>
</bean>

<bean id="pooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
    destroy-method="close">
    <property name="driverClass" value="oracle.jdbc.driver.OracleDriver" />
    <property name="jdbcUrl" value="jdbc:oracle:thin:@host:1521:db" />
    <property name="user" value="dbuser" />
    <property name="password" value="passwd" />
    <property name="minPoolSize" value="5" />
    <property name="maxPoolSize" value="10" />
    <property name="maxStatements" value="0" />
</bean>

<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceUnitManager" ref="pum" />
    <property name="dataSource" ref="pooledDataSource" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
    </property>
</bean>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />

persistence.xml:

<persistence version="1.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

<persistence-unit name="AppPU" transaction-type="RESOURCE_LOCAL">

    <properties>

        <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />            
        <property name="hibernate.show_sql" value="false" />
        <property name="hibernate.jdbc.batch_size" value="50" />

        <property name="hibernate.archive.autodetection" value="class"/>    
        <property name="hibernate.cache.region.factory_class" value="net.sf.ehcache.hibernate.EhCacheRegionFactory" />
        <property name="hibernate.cache.use_query_cache" value="true" />
        <property name="hibernate.cache.use_second_level_cache" value="true" />

    </properties>

</persistence-unit> 

</persistence>

Exception:

java.lang.UnsupportedOperationException: The user must supply a JDBC connection
at org.hibernate.connection.UserSuppliedConnectionProvider.getConnection(UserSuppliedConnectionProvider.java:54)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1573)
at org.hibernate.loader.Loader.doQuery(Loader.java:696)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.doList(Loader.java:2228)
at org.hibernate.loader.Loader.listUsingQueryCache(Loader.java:2157)
at org.hibernate.loader.Loader.list(Loader.java:2117)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.orm.jpa.SharedEntityManagerCreator$DeferredQueryInvocationHandler.invoke(SharedEntityManagerCreator.java:310)
at $Proxy286.getResultList(Unknown Source)
at com.embraer.core.jpa.DaoSupport.execQueryIndexedParameters(DaoSupport.java:327)
at com.embraer.core.jpa.DaoSupport.findByNamedQuery(DaoSupport.java:280)
at com.embraer.core.jpa.DaoSupport.findAll(DaoSupport.java:132)
at br.com.embraer.aheadpro.dao.imp.ConfigDAOImpl.findAll(ConfigDAOImpl.java:41)
at br.com.embraer.aheadpro.dao.ConfigRepoDAO.getAll(ConfigRepoDAO.java:35)
at br.com.embraer.aheadpro.service.ConfigService.refresh(ConfigService.java:27)
at br.com.embraer.aheadpro.service.ConfigService.getConfig(ConfigService.java:35)
at br.com.embraer.aheadpro.service.EmailService.init(EmailService.java:81)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:340)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:293)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:130)
... 91 more

Thanks everybody!

Answer 1

Maybe this might help: http://thejavablog.wordpress.com/2010/11/26/java-lang-unsupportedoperationexception-the-user-must-supply-a-jdbc-connection/ , it basically says that there's something missing from persistence.xml ( <provider>org.hibernate.ejb.HibernatePersistence</provider> or maybe hibernate.connection.provider_class -property ?), and Hibernate's ConnectionProviderFactory chooses to create a UserSuppliedConnectionProvider, which has getConnection defined as such:

public Connection getConnection() {
    throw new UnsupportedOperationException("The user must supply a JDBC connection");
}

I also compared this with one of our own Hibernate/JPA -setups that works just fine with C3PO, and the only differences I spotted were that we pass some more properties to c3p0.ComboPooledDataSource and some properties to org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter when defining EntityManagerFactory in the Spring configuration xml:

<property name="jpaVendorAdapter">          
    <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
        <property name="showSql" value="false" />
        <property name="generateDdl" value="false" />
        <property name="databasePlatform" value="${jdbc.dialectClass}" />
    </bean>
</property>         

But I doubt that could be it. There are no properties defined in our persistence.xml (at all).