事務和JPA/persistence.xml中

Question

我使用Hibernate的JPA實現的（我如下因素Camel Tracer example）

我使用Hibernate的JPA實現具有交易問題：

<dependency> 
    <groupId>org.hibernate</groupId> 
    <artifactId>hibernate-entitymanager</artifactId> 
    <version>4.3.5.Final</version> 
</dependency> 

如果我有一個持久性.XML在我的META-INF文件夾，一切正常OK：

<persistence xmlns="http://java.sun.com/xml/ns/persistence" 
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
      version="1.0"> 
    <persistence-unit name="tracer" transaction-type="RESOURCE_LOCAL"> 
    <class>org.apache.camel.processor.interceptor.jpa.JpaTraceEventMessage</class> 
    <properties> 
     <property name="hibernate.dialect" value="..."/> 
     <property name="hibernate.connection.driver_class" value="..."/> 
     <property name="hibernate.connection.url" value="..."/> 
     <property name="hibernate.hbm2ddl.auto" value="create"/> 
     <property name="hibernate.connection.username" value="..." /> 
     <property name="hibernate.connection.password" value="..."/> 
    </properties> 
    </persistence-unit> 
</persistence> 

我想使用Java的方式，所以我刪除persistence.xml並創建跟隨着摹豆：

javax.persistence.TransactionRequiredException: no transaction is in progress 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.checkTransactionNeeded(AbstractEntityManagerImpl.java:1171) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:1332) 
    at org.apache.camel.component.jpa.JpaProducer$1.doInTransaction(JpaProducer.java:86) 

這是因爲「無交易是有點奇怪：

@Configuration 
@EnableTransactionManagement 
public class AppConfiguration 
{ 
     @Bean public EntityManagerFactory entMngFac() 
     { 
     EntityManagerFactory emf = Persistence.createEntityManagerFactory("tracer"); 
     return emf; 
     } 
     @Bean public DataSource ds() 
     { 
     DriverManagerDataSource dataSource = new DriverManagerDataSource(); 
     dataSource.setDriverClassName("..."); 
     dataSource.setUrl("..."); 
     dataSource.setUsername("..."); 
     dataSource.setPassword("..."); 
     return dataSource; 
     } 
     @Bean public PlatformTransactionManager ptm(EntityManagerFactory emf, DataSource ds) 
     { 
     JpaTransactionManager jpat = new JpaTransactionManager(); 
     jpat.setDataSource(ds); 
     jpat.setEntityManagerFactory(emf); 
     return jpat; 
     } 
     @Bean public TransactionTemplate tranTemp(PlatformTransactionManager ptm) 
     { 
     TransactionTemplate tt = new TransactionTemplate(); 
     tt.setTransactionManager(ptm); 
     return tt; 
     } 
} 

保存，當駱駝試圖刷新JPATracer對象已經創建，我得到下面的異常後進度「錯誤來自」doInTransaction「方法。

我的想法是，駱駝啓動一個事務，然後Hibernate試圖刷新對象，並不知​​道駱駝已經開始的事務？所以在某處有一些交易的組合，但我無法弄清楚在哪裏。

Answer 1

試着用以下的EntityManagerFactory配置（注意packagesToScan調用）

@Bean 
public EntityManagerFactory entityManagerFactory() { 
    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean(); 
    em.setDataSource(ds()); 
    em.setPackagesToScan(new String[] { "org.apache.camel.processor.interceptor.jpa" }); 
    JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter(); 
    em.setJpaVendorAdapter(vendorAdapter); 
    return em.getObject(); 
}