Hibernate exception isnt getting caught

Question

I facing problem where every try catch block is somehow ignored.

I have structure like this:

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.

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?

What could cause the problem?

Thanks!

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 ractEntityPersister.insert(AbstractEntityPersister.java:3682) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:90) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:356) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1454) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:511) ~[hibernate -core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3283) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2479) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:473) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:178) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:39) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransact ionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:271) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:98) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.springframework.orm.hibernate5.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:609) ~[spring-orm-5.0.7.RELEASE.jar:5.0.7.RELEASE] ... 35 more Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '2-1' for key 'PRIMARY' at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_121] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_121] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_121] at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_121] at com.m ysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.Util.getInstance(Util.java:408) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2486) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStat ement.java:2079) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2013) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5104) ~[mysql-connector-java-5.1.46.jar:5.1.46] at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1998) ~[mysql-connector-java-5.1.46.jar:5.1.46] at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:175) ~[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.AbstractEntityPersister.insert(AbstractEntityPersister.java:3682) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:90) ~[hibernate-core-5.3.2.Final.jar:5.3. 2.Final] at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:356) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1454) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:511) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3283) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.internal.SessionImpl.beforeTransactionCom pletion(SessionImpl.java:2479) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:473) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:178) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:39) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:271) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.hibernate.engine.transaction.internal.TransactionImpl.commit(Transactio nImpl.java:98) ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final] at org.springframework.orm.hibernate5.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:609) ~[spring-orm-5.0.7.RELEASE.jar:5.0.7.RELEASE] ... 35 more

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '2-1' for key 'PRIMARY'

Answer 1

Reason you can't catch it this way is that Exception appear during Transaction flush and not during try-catch or save block.

Maybe think about checking if the record exist in the database before trying to save it again?

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.