休眠异常不会被捕获
[英]Hibernate exception isnt getting caught
问题描述
I facing problem where every try catch block is somehow ignored. 
我面临的问题是每个尝试捕获块都被忽略了。
I have structure like this: 我有这样的结构：
void A(){
// some logic
try{
service.createItem(...);
}catch(Exception e){
System.out.println("blabla...");
}
}
service$createItem(...){
// some logic - building item.
try{
dao.saveItem( item );
}catch(Exception e){
throw new IllegalArgumentException("bla bla");
}
}
dao$saveItem(Item item){
Session session = sessionFactory.getCurrentSession();
session.save(item);
}
Item is unique, howeven when i try to insert duplicate, instead of catching exception and printing "bla bla", it just prints whole stacktrace -- like exception isnt handled at all. Item是唯一的，即使我尝试插入重复项，也不会捕获异常并打印“ bla bla”，而只是打印整个stacktrace-就像根本没有处理异常一样。
Debugging shows it doesnt even jump into catch block of A method, i havent met with anything like this before, have anyone had this situation? 调试显示它甚至没有跳到A方法的catch块中，我之前从未遇到过类似的事情，有人遇到过这种情况吗？
What could cause the problem? 是什么原因引起的？
Thanks! 谢谢！
stackStrace: stackStrace：
used by: org.hibernate.exception.ConstraintViolationException: could not execute statement at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:59) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:178) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3167) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.persister.entity.Abst
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '2-1' for key 'PRIMARY'
1 个解决方案
解决方案1
2 已采纳 2019-04-08 21:43:38
Reason you can't catch it this way is that Exception appear during Transaction flush and not during try-catch or save block. 您无法以这种方式捕获它的原因是，异常在事务刷新期间出现，而不在try-catch或save块出现。
Maybe think about checking if the record exist in the database before trying to save it again? 也许考虑在再次尝试保存记录之前检查记录是否存在于数据库中？
So to solve the problem you must make try-catch on Class/method that is Transactional or move Transactional to Class that save to database. 因此，要解决该问题，您必须对事务型的类/方法进行try-catch或将事务型移动到保存到数据库的类。
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