How to Switch from One DB Instance to…
Sometimes we may need to switch from one db instance from another during runtime. Actually this is very easy if you are using Spring and DataSource API in order to obtain DB connections. Lets look…
Be Careful When Using Parent-Child Associations in Hibernate
Parent-child relationships are a special case of more general 1:M associations. They are simply part-whole relationships and for Hibernate it is not meaningful that parts (childs) should exist without belonging a whole (parent). Parent-child association…
Hibernate’s New Feature For Overcoming Frustrating LazyInitializationExceptions
For many years LazyInitializationExceptions have become most frustrating point of Hibernate. This exception occurs when you try to access an un-initialised lazy association of a detached entity. In general, entities become detached in three different…
Spring ve Tapestry’de IoC Yaklaşımları 2
İlk bölümde Spring ve Tapestry Framework'lerini IoC container oluşturma kabiliyetleri ve bağımlılıkların enjekte edilmesi konuları üzerinde durmuştuk. Bu bölümde ise kaldığımız yerden bean'ların scope yönetimi ile devam edelim. Scope Yönetimi Tapestry'de varsayılan olarak servisler'in scope'u…
Another Difference Between Autowire byType and constructor
Lets keep playing with autowiring behaviour of Spring Framework. Autowire byType or byName is not required by default. In other words, they will do nothing if they cannot find suitable candidates to inject into target…
Weird Autowiring Behaviour in Spring Framework
During lab sessions in our Enterprise Java trainings I usually leave the main track of lab outlines and start trying various cases related with the topic. It is a bit risky for me but it…
TransactionTemplate and Rollback Rules
When I was playing with TransactionTemplate during one of my Spring training sessions, I promptly suggested audience with trying to change default rollback rules while using TransactionTemplate. After all TransactionTemplate encapsulates boilerplate transaction begin, commit/rollback…
How to build SessionFactory in Hibernate 4
Well, I think it is the first time in Hibernate's history that it is released with incomplete feature implementations and documentation. I came to this conclusion when I see Configuration.buildSessionFactory() method as deprecated. When I…
StringHttpMessageConverter DEFAULT_CHARSET Limitation for Turkish Content
Spring has its own REST support known as Spring Web MVC. Although, I am happy with its general capabilities, I came up with a small but very annoying problem or let's say limitation related with…
Sorting Your Beans With Spring OrderComparator
Sometimes you may need to execute your collection of beans in a a specified order. For example, in one of our projects, we have collection of EventHandlers which operate on when certain Events occur. For…