事务回滚？答案

【问题标题】：transaction rolled back?事务回滚？
【发布时间】：2012-01-16 11:54:55
【问题描述】：

Caused by: javax.transaction.RollbackException: Transaction marked for rollback.
at com.sun.enterprise.transaction.JavaEETransactionImpl.commit(JavaEETransactionImpl.java:473)
at com.sun.enterprise.transaction.JavaEETransactionManagerSimplified.commit(JavaEETransactionManagerSimplified.java:852)
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5114)
... 63 more
Caused by: java.lang.IllegalStateException: During synchronization a new object was found through a relationship that was not marked cascade PERSIST: com.model.Product[ id=1 ].
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.discoverUnregisteredNewObjects(RepeatableWriteUnitOfWork.java:302)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.calculateChanges(UnitOfWorkImpl.java:695)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1482)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.issueSQLbeforeCompletion(UnitOfWorkImpl.java:3135)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.issueSQLbeforeCompletion(RepeatableWriteUnitOfWork.java:344)
at org.eclipse.persistence.transaction.AbstractSynchronizationListener.beforeCompletion(AbstractSynchronizationListener.java:157)
at org.eclipse.persistence.transaction.JTASynchronizationListener.beforeCompletion(JTASynchronizationListener.java:68)
at com.sun.enterprise.transaction.JavaEETransactionImpl.commit(JavaEETransactionImpl.java:435)
... 65 more

我在使用persist() 方法将实体插入数据库时遇到了这个回滚异常.....这个异常背后的原因是什么？

【问题讨论】：

标签： java database jpa ejb

【解决方案1】：

检查您是否已正确设置所有双向关系（在您的com.model.Product 实体和与其相关的其他实体之间）。

例如，如果存在从 Product 到 Manufacturer 的多对一关系，您将有如下内容：

Product product = new Product();
product.setId(1);

Manufacturer manufacturer = new Manufacturer ();
manufacturer.setId(123);
product.setManufacturer(manufacturer); // set Many-1 side of relationship

Set<Product> products = new HashSet<Product>();
products.add(product);
manufacturer.setProducts(products); // set 1-Many side of relationship

【讨论】：

【解决方案2】：

在插入hbm 文件之前，可能会有一些级联问题（set cascade=all）。

【讨论】：