无法让C3PO与Spring + JPA + Hibernate一起使用

Question

我正在尝试使用JPA事务管理器在我的Spring + Hibernate应用程序（Java配置）中配置C3PO，但无法使其工作。以下是我的HibernateConfig类。请帮忙！

PS：最初，我已将HibernateConfig类配置为使用HibernateTransactionManager并且我已成功配置C3PO，但当我切换到使用JPA事务管理器和EntityManagerFactory时，设置C3PO属性不起作用什么都没有。我尝试使用nativ C3PO键以及键的Hibernate版本设置C3PO属性，但无济于事。

package com.company.core.configuration;

import java.util.Properties;
import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableTransactionManagement
@ComponentScan({"com.company.core.data"})
public class EntityManagerFactoryConfiguration {
    public EntityManagerFactoryConfiguration() {
        super();
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource());
        em.setPackagesToScan(new String[]{"com.company.core.data.pojos"});

        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);

        Properties hibernateProperties = new Properties();
        hibernateProperties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");
        hibernateProperties.setProperty("hibernate.show_sql", "false");
//        hibernateProperties.setProperty("hibernate.connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider");
//        hibernateProperties.setProperty("hibernate.c3p0.max_size", "100");
//        hibernateProperties.setProperty("hibernate.c3p0.min_size", "0");
//        hibernateProperties.setProperty("hibernate.c3p0.acquire_increment", "1");
//        hibernateProperties.setProperty("hibernate.c3p0.idle_test_period", "200");
//        hibernateProperties.setProperty("hibernate.c3p0.max_statements", "0");
//        hibernateProperties.setProperty("hibernate.c3p0.timeout", "300");
        em.setJpaProperties(hibernateProperties);

        return em;
    }

    @Bean
    public DataSource dataSource() {
        final org.springframework.jdbc.datasource.DriverManagerDataSource dataSource = new org.springframework.jdbc.datasource.DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://127.0.0.1/databasename?autoReconnect=true");
        dataSource.setUsername("user");
        dataSource.setPassword("password");

        return dataSource;
    }

    @Bean
    public DataSource c3p0dataSource() {
        final com.mchange.v2.c3p0.DriverManagerDataSource dataSource = new com.mchange.v2.c3p0.DriverManagerDataSource();
        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1/databasename?autoReconnect=true");
        dataSource.setUser("user");
        dataSource.setPassword("password");

        return dataSource;
    }


    @Bean
    public PlatformTransactionManager transactionManager(final EntityManagerFactory emf) {
        final JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(emf);
        return transactionManager;
    }

    @Bean
    public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
        return new PersistenceExceptionTranslationPostProcessor();
    }