我正在尝试在服务层中捕获ConstraintViolationException并重新抛出用户定义的已检查异常。我正在我的控制器中捕获异常并向我的BindingResult添加一个错误对象。我正在使用声明式事务管理我试图使我的DAO成为一个存储库，并添加了一个PersistenceExceptionTranslationPostProcessor来捕获一个Spring翻译的异常。我还添加了一个txAdvice来回滚所有throwables。我的异常确实被抓住但是我收到错误500：
Hibernate: insert into user (email, password, first_name, last_name, userType) values (?, ?, ?, ?, 1)
[acme]: [WARN ] - 2013-Feb-05 11:12:43 - SqlExceptionHelper:logExceptions(): SQL Error: 1062, SQLState: 23000
[acme]: [ERROR] - 2013-Feb-05 11:12:43 - SqlExceptionHelper:logExceptions(): Duplicate entry 'admin' for key 'email_unique'
[acme]: [DEBUG] - 2013-Feb-05 11:12:43 - HibernateTransactionManager:processCommit(): Initiating transaction commit
[acme]: [DEBUG] - 2013-Feb-05 11:12:43 - HibernateTransactionManager:doCommit(): Committing Hibernate transaction on Session [SessionImpl(PersistenceContext[entityKeys=[],collectionKeys=[]];ActionQueue[insertions=[] updates=[] deletions=[] collectionCreations=[] collectionRemovals=[] collectionUpdates=[] unresolvedInsertDependencies=UnresolvedEntityInsertActions[]])]
[acme]: [ERROR] - 2013-Feb-05 11:12:43 - AssertionFailure:<init>(): HHH000099: an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session): org.hibernate.AssertionFailure: null id in com.test.model.AdminUser entry (don't flush the Session after an exception occurs)
[acme]: [DEBUG] - 2013-Feb-05 11:12:43 - HibernateTransactionManager:doRollbackOnCommitException(): Initiating transaction rollback after commit exception
org.hibernate.AssertionFailure: null id in com.test.model.AdminUser entry (don't flush the Session after an exception occurs)
at org.hibernate.event.internal.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:79)
at org.hibernate.event.internal.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:194)
at org.hibernate.event.internal.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:156)
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:225)
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1213)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:402)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
at org.springframework.orm.hibernate4.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:468)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
我的控制器：
@RequestMapping (method = RequestMethod.POST)
@Transactional
public String registerAdmin(@Valid @ModelAttribute("user") AdminUser user, BindingResult bindingResult, ModelMap model) {
if (bindingResult.hasErrors()) {
return "admin/admins/form";
}
else if (!user.getPassword().equals(user.getConfirmPassword())) {
bindingResult.addError(new ObjectError("user.confirmPassword", "Passwords don't match"));
return "admin/admins/form";
}
else {
user.setPassword(passwordEncoder.encodePassword(user.getPassword(), null));
try {
userService.save(user);
return "redirect:/admin/admins";
} catch(ApplicationException ce) {
bindingResult.addError(new ObjectError("user.email", "Email already registered"));
return "admin/admins/form";
}
}
}
我的Spring配置的一部分：
<context:component-scan base-package="com.test.dao, com.test.service" />
<context:property-placeholder location="/WEB-INF/spring.properties"/>
<import resource="springapp-security.xml"/>
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/testdb?zeroDateTimeBehavior=convertToNull"/>
<property name="username" value="test"/>
<property name="password" value="test"/>
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="myDataSource"/>
<property name="mappingLocations" value="classpath*:com/test/model/hbm/**/*.hbm.xml" />
<property name="hibernateProperties">
<value>
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.show_sql=true
</value>
</property>
</bean>
<tx:annotation-driven />
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<tx:advice id="txAdvice">
<tx:attributes>
<tx:method name="*" rollback-for="Throwable" />
</tx:attributes>
</tx:advice>
服务层：
public class UserServiceImpl implements UserDetailsService, UserService {
private UserDAO dao;
@Override
public void save(User c) throws ApplicationException {
try {
dao.save(c);
} catch(DataIntegrityViolationException cve) {
throw new ApplicationException("email already registered");
}
}
如果我没有捕获运行时异常，我没有得到hibernate异常（不要刷新会话..）
答案 0 :(得分：4)
您可能希望从控制器中删除事务注释并将其添加到服务层。
服务层如下所示。如果服务层抛出了已检查的异常，则可以将其添加到注释中，以便甚至不会尝试提交插入。
public class UserServiceImpl implements UserDetailsService, UserService {
private UserDAO dao;
@Override
@Transactional(rollbackFor=ApplicationException.class)
public void save(User c) throws ApplicationException {
try {
dao.save(c);
} catch(DataIntegrityViolationException cve) {
throw new ApplicationException("email already registered");
}
}
当前代码中发生的事情是事务没有被回滚但必须回滚，因为它实际上试图提交数据但是因为数据库约束事务必须回滚。通过使用@Transactional（rollbackFor = ApplicationException.class）强制回滚，它将不允许事务执行提交但它将回滚，你的应用程序仍然会将错误添加到BindingResult。