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POWhere and how handle spring+hibernate exceptions?
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copied!<p>im using spring+hibernate for a desktop application.</p> <p>I'm trying to build it with a layered implementation, so i have:</p> <p><strong>GUI layer --call--> Service layer --call--> DAO layer</strong></p> <p>A small example to better exaplain my situation:</p> <pre><code>// In GUI layer private void actionPerformed(ActionEvent evt){ addUser(); } private void addUser(){ // Check gui validation for user inputs if(inputIsValid()){ String username=nameText.getText(); String pass=passText.getText(); //Now call service layer userService.createUser(username, pass); // Now here i want to show a message to user like // "Operation successful" or "Operation failed" // or more sofisticated message like "User with same name already exists" } } // Service layer @Transactional public void createUser(String name, String pass){ User user=new User(name, pass); userDao.save(user); } // Another service layer example, @Transactional public boolean createUser(String name, String pass){ User user=new User(name, pass); try{ userDao.save(user); } catch(Exception ex){ Log(ex); return false; } return true; // In this case GUI layer can know if save is succesful, but it can't know WHY // the save is failed : some username? DB service shutdown? etc.. } </code></pre> <p>The problem is: who throw exception and who handle it?</p> <p>I think DAO have to throw first exception, and service layer rethrow it, and finally GUI layer handle exception, so i can show message to user, is this good? There is a way to build some ExceptionHandler using spring?</p> <p><strong>What is the best practice to manage exceptions using spring+hibernate?</strong></p> <p>Thanks.</p>

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