Hvorfor kan jeg ikke få den exception (spring)

Jeg har et kørende spring/hibernate program, jeg kan ligge en zipcode og en customer ned i en DB. Det virker.

Men hvis jeg nu forsøger at hente en customer op, som ikke findes, så går det galt.

/// kode ///

public class CustomerDAO {

    private HibernateOperations hibernateOperations;

    public Customer retrieveCustomer(long customerID) throws CustomerDoesNotExists {
        Customer customer;
        customer = (Customer) hibernateOperations.load(Customer.class, customerID);
       
//        if (hibernateOperations.contains(customer))
//            throw new CustomerDoesNotExists();
        return customer;
    }

/// slut ///

jeg får denne exception:

log4j:WARN No appenders could be found for logger (org.springframework.beans.factory.xml.XmlBeanDefinitionReader).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:56)
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:98)
    at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:158)
    at cws.entity.Customer$$EnhancerByCGLIB$$94e98969.toString(<generated>)
    at conf.Main.run(Main.java:39)
    at conf.Main.main(Main.java:43)


derfor vil jeg fange en exception, og derfra kalde min egen.
hvis jeg læser i hibernate dok,

http://static.springframework.org/spring/docs/1.1.5/api/org/springframework/orm/hibernate/HibernateOperations.html#load(java.lang.Class,%20java.io.Serializable)


så vil hibernate.... load, give mig en

HibernateObjectRetrievalFailureException


hvis en instance ikke findes. Men hvis jeg omgiver min kode, med en try catch block:

    public Customer retrieveCustomer(long customerID) throws CustomerDoesNotExists {
        Customer customer = null;
        try {
            customer = (Customer) hibernateOperations.load(Customer.class, customerID);
        } catch (HibernateObjectRetrievalFailureException e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
            throw new CustomerDoesNotExists();
        }           
        return customer;
    }


så få jeg samme fejl: altså min try catch bloc er ikke blevet kalt.

log4j:WARN No appenders could be found for logger (org.springframework.beans.factory.xml.XmlBeanDefinitionReader).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:56)
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:98)
    at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:158)
    at cws.entity.Customer$$EnhancerByCGLIB$$84c91598.toString(<generated>)
    at conf.Main.run(Main.java:39)
    at conf.Main.main(Main.java:43)



Hvordan skal jeg fedt min egen lille exception ind ?