Skip to main content

Spring 4 + Hibernate 4 / Java configuration / rest service example with gradle

In this post I'll explain the required work to create a rest API utilizing both spring and hibernate version 4, and the configuration will be using java configuration classes not XML.

I'll use gradle to build and for dependency management, it's way easier than maven and keeps you focused on the application, if you are not familiar with gradle and interested in it see my previous post about it.

The first part which is dependency management is covered in gradle post mentioned above.
I'll skip to explain each tier of the project and its configurations:


As you can see we have 4 tiers:

1) DAO tier / data tier
In this tier we configure the datasource and hibernate, I used HSQL in memory db it can be easily substituted with other db engine providing the right dependencies


The DaoConfig defines the data source, transaction manager, session factory and  hibernate properties

The most important part is the annotations :
1) @Configuration : to tell spring that this is a configuration class
2) @PropertySource("classpath:dao.properties") : is to load the properites file for this configuration
3) @ComponentScan({ "com.blabadi.gradle.dao" }) : is to tell spring container to scan the specific packages to look for beans, like Dao classes and entities
4) @EnableTransactionManagement : is similar to xml configuration <tx:annotation-driven>
responsible for registering the necessary Spring components that power annotation-driven transaction management (to be able to use @Transactional).

The rest is the person DO and the person DAO :




2) Business logic tier

configuration here is simple, and the person service is utilizing the @Transnational  annotation

3) Rest tier

this is where the web app configuration is, and exposes the Person APIs

The WebConfig.java contains the spring web configuration for the rest project, it uses the @EnableWebMvc to configure the spring dispatcher servlet.

The WebAppInit.java is actually the replacement for web.xml in the java servlet 3 standard it looks for a class the implements  WebApplicationInitializer interface as replacement for the web.xml

Note that I had to add the dependency for servlet-api-3.0.1 to my gradle as compile time dependency but that's not the best way, because it will be provided by the application server.


Comments

  1. Thanks for the write-up, 2 years later and it still helped me solve my issue with latest Hibernate.

    ReplyDelete

Post a Comment

Popular posts from this blog

Android RecyclerView - Adding Empty View

So RecyclerView was introduced to replace List view and it's optimized to reuse existing views and so it's faster and more efficient as stated in the documentation: https://developer.android.com/training/material/lists-cards.html While using it, I faced the issue of missing a useful functionality that is implemented in ListView. that feature is setting an empty view in case there was no records. In ListView it was as simple as this View emptyView = findViewById(R.id.mylist_empty_view); ListView  myList = .... myList.setEmptyView(emptyView); but this method doesn't exist for recycler view so we need a work around until android team fixes this. and here are the screen shots of both list view and recycler view fix List view : Recycler view : here is how I fixed it: here is the content of empty_view, it can be anything. Enjoy.

[PART 5] NuTracker ReactJS app - Add Login & Profile using Router

In the previous part we finished the dashboard read functionality, now we want to add the skeleton for other pages: - Login   In this page the user will be able to login to their account and the dashboard won't show unless the user is logged in. - Profile In this page the user will be able to update their daily nutrition goals that they can track in the dashboard. to be able to have multiple 'pages' in react and navigate from one to one, we need something that can switch the rendered content based on what we want, we can do that with if statements in the App components and store some location state, but why invent the wheel. React Router every major single page app web framework has the routing concept and functionality to interact with the usual browser urls and switch the content based what user should see. for example on the profile page I want the url path to be /profile, and for login to be /login and so on. in more advanced cases you want the users

Microservices 101, Docker & spring boot sample [Windows 10, home]

This is a very simplistic article :) if you are looking for a deep dive in microservices, see my state-of-the-art microservices full archeticture here: http://dev.basharallabadi.com/2019/03/part-1-spring-state-of-art.html   What are micro services? It's an architectural model for web services that basically requires each service** to be completely independent and loosely coupled from other consumer services, or services that it depends on. and it's not a new idea but it's catching pace in today large scale web applications. ** (by service we mean a component that controls and implements the business logic in a self contained manner, like orders service, products catalog service, accounts management service, all of these have their domain and can be clearly separated)   Why micro services emerged ? 1- Easy to scale services: if you have a single application and all the services share the same code base and war (package) then if you receive high demand on one