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copied!<p>In my application I didn't implement TransactionManagerConfigurer interface. I use next code to configure JPA (with Hibernate implementation). You can do the same in your configuration class.</p> <pre><code> @Bean public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() { LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean(); factoryBean.setDataSource(dataSource()); factoryBean.setPackagesToScan(new String[] {"com.dimasco.springjpa.domain"}); HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter(); vendorAdapter.setShowSql(true); //vendorAdapter.setGenerateDdl(generateDdl) factoryBean.setJpaVendorAdapter(vendorAdapter); Properties additionalProperties = new Properties(); additionalProperties.put("hibernate.hbm2ddl.auto", "update"); factoryBean.setJpaProperties(additionalProperties); return factoryBean; } @Bean public DataSource dataSource() { final ComboPooledDataSource dataSource = new ComboPooledDataSource(); try { dataSource.setDriverClass(driverClass); } catch (PropertyVetoException e) { throw new RuntimeException(e); } dataSource.setJdbcUrl(jdbcUrl); dataSource.setUser(user); dataSource.setPassword(password); dataSource.setMinPoolSize(3); dataSource.setMaxPoolSize(15); dataSource.setDebugUnreturnedConnectionStackTraces(true); return dataSource; } @Bean public PlatformTransactionManager transactionManager() { JpaTransactionManager transactionManager = new JpaTransactionManager(); transactionManager.setEntityManagerFactory(entityManagerFactoryBean().getObject()); return transactionManager; } @Bean public PersistenceExceptionTranslationPostProcessor exceptionTranslation(){ return new PersistenceExceptionTranslationPostProcessor(); } </code></pre> <p>Hope this will help you)</p> <p><strong>EDIT:</strong></p> <p>You can get datasource using JNDI lookup:</p> <pre><code>@Bean public DataSource dataSource() throws Exception { Context ctx = new InitialContext(); return (DataSource) ctx.lookup("java:comp/env/jdbc/datasource"); } </code></pre> <p>More details you can find <a href="http://www.swiftmind.com/de/2011/06/22/spring-3-1-m2-testing-with-configuration-classes-and-profiles/">in this article</a>. There is example with JndiDatasourceConfig class.</p> <p><strong>EDIT 2:</strong> I ahve persistence.xml in my project, but it is empty:</p> <pre><code><persistence version="2.0" 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_2_0.xsd"> <persistence-unit name="JPA_And_Spring_Test"> </persistence-unit> </persistence> </code></pre> <p>And I didn't specify any persistent unit name in my java configuration.</p>

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