Java HibernateException：无法获取当前线程的事务同步会话
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HibernateException: Could not obtain transaction-synchronized Session for current thread
提问by J.Olufsen
I am getting error:
我收到错误：
Exception in thread "main" org.hibernate.HibernateException:
Could not obtain transaction-synchronized Session for current thread
main
主要的
ppService.deleteProductPart(cPartId, productId);
@Service("productPartService")
@Service("productPartService")
@Override
public void deleteProductPart(int cPartId, int productId) {
productPartDao.deleteProductPart(cPartId, productId);
}
@Repository("productPartDAO")
@Repository("productPartDAO")
@Override
public void deleteProductPart(ProductPart productPart) {
sessionFactory.getCurrentSession().delete(productPart);
}
@Override
public void deleteProductPart(int cPartId, int productId) {
ProductPart productPart = (ProductPart) sessionFactory.getCurrentSession()
.createCriteria("ProductPart")
.add(Restrictions.eq("part", cPartId))
.add(Restrictions.eq("product", productId)).uniqueResult();
deleteProductPart(productPart);
}
How to fix it?
如何解决？
UPDATE:
更新：
If I modify method like this:
如果我像这样修改方法：
@Override
@Transactional
public void deleteProductPart(int cPartId, int productId) {
System.out.println(sessionFactory.getCurrentSession());
}
It returns:
它返回：
SessionImpl(PersistenceContext[entityKeys=[],collectionKeys=[]];ActionQueue[insertions=[] updates=[] deletions=[] collectionCreations=[] collectionRemovals=[] collectionUpdates=[] collectionQueuedOps=[] unresolvedInsertDependencies=UnresolvedEntityInsertActions[]])
But if I remove @Transactionalit ends up with exception:
但是，如果我将@Transactional其删除，则会出现异常：
org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread
I get it working by adding @Transactional, but now I am getting org.hibernate.MappingException: Unknown entity: ProductPartalthough I chained .uniqueResult()to Criteria. How to fix it?
我通过添加来让它工作@Transactional，但现在我得到了org.hibernate.MappingException: Unknown entity: ProductPart虽然我链接.uniqueResult()到Criteria. 如何解决？
采纳答案by Chaitanya
The error org.hibernate.MappingException: Unknown entity: ProductPartindicates there is no entity with name ProductPart. One way to fix this issue is to pass the Classobject to createCriteriamethod as:
该错误org.hibernate.MappingException: Unknown entity: ProductPart表明没有名为 name 的实体ProductPart。解决此问题的一种方法是将Class对象传递给createCriteria方法：
createCriteria(ProductPart.class)
From API the difference in using String and Class is as follows:
从 API 来看，使用 String 和 Class 的区别如下：
Session.createCriteria(String)
Create a new Criteria instance, for the given entity name.
Create a new Criteria instance, for the given entity class, or a superclass of an entity class, with the given alias.
使用给定的别名为给定的实体类或实体类的超类创建一个新的 Criteria 实例。
If you pass a String then hibernate looks for an entity whose name is declared as ProductPart.
如果您传递一个字符串，则休眠会查找名称声明为ProductPart.
回答by Ayman Al-Absi
With Hibernate 4.x and Spring 4.x, just Add @Transactional after @Repositoryit will solve this synchronizaion exception.
对于 Hibernate 4.x 和 Spring 4.x，只需在 @Repository 之后添加 @Transactional 即可解决此同步异常。
回答by Anand Rockzz
You must enable the transaction support (<tx:annotation-driven>or @EnableTransactionManagement) and declare the transactionManager and it should work through the SessionFactory.
您必须启用事务支持（<tx:annotation-driven>或@EnableTransactionManagement）并声明事务管理器，它应该通过 SessionFactory 工作。
You must add @Transactionalinto your @Repository
您必须添加@Transactional到您的@Repository
With @Transactionalin your @RepositorySpring is able to apply transactional support into your repository.
随着@Transactional在你的@Repository春天是能够应用的事务处理支持到你的资料库。
Your Student class has no the @javax.persistence.*annotations how @Entity, I am assuming the Mapping Configuration for that class has been defined through XML.
您的 Student 类没有@javax.persistence.*注释@Entity，我假设该类的映射配置已通过 XML 定义。
回答by pooja patil
I had same error as "org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread"
我有与“org.hibernate.HibernateException：无法获得当前线程的事务同步会话”相同的错误
I just used @Transactional(readOnly = false)in my Daoimplementation resolved my issue
我刚刚在Dao实现中使用了@Transactional(readOnly = false)解决了我的问题
