Exception Handling Strategy with Spring/JPA/JSF

Question

We are using JSF, Spring and JPA in our application. We are trying to simplify our Exception Handling strategy for our project.

Our application architecture is like below:

UI(JSF) --> Managed Beans --> Service --> DAO

We are using Exception Translation bean post processor for DAO layer. This is configured in Spring Application Context file.

<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" /> 

Where Spring wraps all database exceptions to 'org.springframework.dao.DataAccessException'. We are not doing any other exception handling in DAO Layer.

Our strategy to handle exceptions like below:

Presentation Layer:

Class PresentationManangedBean{

 try{
      serviceMethod();
   }catch(BusinessException be){
      // Mapping exception messages to show on UI
   }
   catch(Exception e){
       // Mapping exception messages to show on UI
   }

}

Service Layer

@Component("service")
Class Service{

 @Transactional(propagation = Propagation.REQUIRED, readOnly = false, rollbackFor = BusinessException.class)
 public serviceMethod(){

  try{

      daoMethod();

   }catch(DataAccessException cdae){
      throws new BusinessException(); // Our Business/Custom exception
   }
   catch(Exception e){
      throws new BusinessException();  //  Our Business/Custom exception
   }
 }

}

DAO Layer

@Repository("dao")
Class DAO{

 public daoMethod(){
  // No exception is handled
  // If any DataAccessException or RuntimeException is occurred this 
  // is thrown to ServiceLayer
 }

}

Question: We just want to confirm whether above approach is as per the best practices. If not, please suggest us the best way to handle the exceptions (playing with transaction management)?

Answer 1

This approach looks good to me.We are using same kind of approach in our project.

Vinay