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POUsing transaction in Spring 3.0 in Spring + JPA + Hibernate
 

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    <p>I currently using Spring + JPA + hibernate in a project. Then i decide my design pattern in model dan DAO implementation. I have a abstract for all my transaction purpose class. Every class( as a service) that perform a single update/create/delete task must inherits from this abstract class.</p> <pre><code>public class GlobalAbstractTransaction { public abstract void validation(DTO param); public abstract void process(DTO param); public void execute(DTO param){ validation(param); process(param); } } </code></pre> <p>Then i have another class (subclass of class above)</p> <pre><code>@Service @Transactional //using spring annotation for transactional support public class SomeTransaction extends GlobalAbstractTransaction implements ITransaction { //implements abstract method public void validation(DTO param){ } //implements abstract method public void process(DTO param){ } } </code></pre> <p>The BusinessTransaction is an interface that have one method </p> <pre><code>public interface ITransaction { public execute(DTO param); } </code></pre> <p>Noted that I put @Transactional (with default Propagation.REQUIRED) at class SomeTransaction want to make sure that this class is in a Transaction.</p> <p>When using in IntegrationTest</p> <pre><code>@Autowired //default by name ITransaction someTransaction; @Test public void testInsert(){ DTO someDTO = new DTO(); //apply value for DTO someTransaction.execute(someDTO); } </code></pre> <p>The result is there is no transaction occured. And the someTransaction.execute which only perform inserting data to database task, was not running well.</p> <p>And then I move the @Transactional annotation from SomeTransaction, to GlobalAbstractTransaction so the code would be like this.</p> <p>Modified <strong>GlobalAbstractTransaction</strong></p> <pre><code>public class GlobalAbstractTransaction { public abstract void validation(DTO param); public abstract void process(DTO param); @Transactional //added here public void execute(DTO param){ validation(param); process(param); } } </code></pre> <p>Modified <strong>SomeTransaction</strong></p> <pre><code>@Service //transactional annotation removed public class SomeTransaction extends GlobalAbstractTransaction implements ITransaction { //implements abstract method public void validation(DTO param){ } //implements abstract method public void process(DTO param){ } } </code></pre> <p>Then, the test work, data is inserted to database. </p> <ol> <li>Anybody could explain why this is happening. I can't add @Transactional at SomeTransaction.execute, because it already defined in GlobalAbstractTransaction. Can I add @Transactional add class level instead ?</li> <li><p>SomeTransaction is planned as Service, inside the service I autowired a DAO implementation using autowiring (I don't put any @Transactional at DAO level), that's what most people recommends. I just annotaed DAO implementation as @Repository, the service class as @Service. (note that in my service only perform one task, InsertingService, UpdatingService, DeletingService will be separated in three classes). I'm planning to add another layer for Service Facade ([http://java.dzone.com/articles/jpa-implementation-patterns-3][1]) see link for reference. So i create a class</p> <p>public class ServiceFacadeBean { public void executeTransaction(String name){</p> <p>} }</p></li> </ol> <p>I'm intended to using in the application like this.</p> <pre><code> @Autowired //injected using Spring autowiring ServiceFacadeBean serviceFacadeBean; serviceFacadeBean.execute("com.mycompany.SomeTransaction"); </code></pre> <p>In the implementation of the execute I want to use reflection using "com.mycompany.SomeTransaction" to create instance. but I always get <strong>NullPointerException</strong></p> <pre><code> Class clazz = Class.forName("com.mycompany.SomeTransaction"); clazz.newInstance() &lt;--- get null </code></pre> <p>And I'm intended that 1 service class, only perform 1 transaction task such as Inserting to database. What to best practices for putting @Transactional, or anyone have good links that really explaining well bout Transaction issue using Spring transaction</p> <p>Anyone have experience on this, or have any better design pattern solutions? Thanks</p>
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