Saga pattern with Spring Boot and ActiveMQ During the last days, I dug a little bit into the Saga pattern. The Saga pattern is an architectural pattern which provides an alternative approach to big and long running ACID transactions. It takes a business process and breaks it up into small isolated steps – each of them with its own transaction. The overall […]
Spring-Boot boilerplate project with ActiveMQ and AngularJS During the last couple of months, I wrote a lot blog posts about ActiveMQ (JMS), AngularJS and Spring. Most of those blog posts include some small code snippets, but nothing more. That’s why I decided to setup a “boilerplate project” to show how all those different techniques can go hand in hand in a “real […]
Virtual Topics in ActiveMQ A couple of days ago I published a post about the difference between queues, topics and virtual topics. Today I want to share some practical information on how to use virtual topics in ActiveMQ with Spring Boot. Virtual Topics Virtual topics are a combination of topics and queues. Producers will write messages to a topic […]
Using @ConfigurationProperties to separate service and configuration Roughly about two years ago, I wrote an article called “Why using Spring’s @Value annotation is bad“. I described why you should avoid @Value annotations all throughout your code. By using @Value annotations in services, controllers and other Spring components, you will scatter your configuration through the complete application. In the worst case, you will […]
Expression based security with Spring Security Many web apps have a very simple security concept based on user roles. You might have some admin, some common users and maybe some more roles like a moderator or a super-user. Such a role concept can be easily implemented with Spring Security. For example, you could secure your app based on routes which are […]
Inject mocks with Spring’s @ContextConfiguration One of the biggest strengths of Spring is its ability to make your code testable. By using dependency injection and inversion of control, the Spring context defines which objects will be wired into your beans. This makes it easy to wire services, repositories or what ever you like. But how to wire mocks in your […]
A mocked Spring security configuration for testing Spring security is great! It gives you the possibility to secure your app and to create a login with a few simple lines of code. However, it could also become annoying during development, when you have to log yourself in again and again. So why not create a mocked Spring authentication for development and testing? […]
Gradle’s bootRun and Window’s command length limit Sometimes Gradle’s bootRun and Window’s command length limit are two opponents. If you use bootRun to start your Spring Boot app from Gradle all class path dependencies will be added to the start command. Gradle will run something like this in the end: 1 java -jar MyApp.jar -classpath xx.jar,yy.jar,zz.jar,... That’s fine and will work for a really long time. But […]
Using Spring Data for database views without an ID A database view is a great way to prepare complicated data structures right in the database and present it in a more convenient way. We usually use database views to map our technical driven database structure (with a lot of tables and foreign keys) to a more business driven structure. This means that we might […]
Why using Spring’s @Value annotation is bad @Value Configuration is an important topic of every application which has more than a couple of hundred lines of code. In case you are using Spring, you would typically use Spring’s @Value annotation to load values from a Java properties file. This could look like this: 12345678 @Servicepublic class MyService { @Value("${my.config.property.key}") private String someConfigValue; //...} If you do so, Spring would inject the […]
