Spring populate map from properties file

If you'd like to read more about the Value annotation , we've got an in-depth article on that! If our properties have some common context like the same prefix, we can use the ConfigurationProperties annotation which will map these properties to Java objects:.

Naturally, as our application environment expands and changes development, QA, production, etc. These can interfere with each others if we don't segregate them in some way. We achieve this by maintaining different files or getting the values of the properties through environment variables. The most common way to write "changing" properties is to store them in different files.

These files are environment-specific and our application can load them based on the environment variables. To notify Spring which files to use, we have to set an environment variable - spring.

That being said, if the value of spring. Note : application. If there is the same key-value present both in application. Typically we write all the common properties of every environment in application.

Let's start our application and in the logs, you can see the dev profile being loaded:. As we can see, message.

Any duplicate key would be overridden by the last profile, in the above case being qa. Check out our hands-on, practical guide to learning Git, with best-practices, industry-accepted standards, and included cheat sheet. Stop Googling Git commands and actually learn it! We can also override the internal properties by creating an application. Spring context will override properties using this newly created file.

This is a great way of distributing your application to others, who can override certain properties based on their environment, like database configurations for example. There are other ways to externalize your properties too, such as OS environment variables, command-line arguments, etc. The order in which Spring considers it can be found here.

Many of the applications built nowadays rely on the microservice architecture. Not only are these applications deployed separately but they could have multiple instances of themselves based on load and the total count could easily go above Managing properties in this particular architectural style via conventional methods requires too much effort.

Also, to change a property, we have to re-build the application again and deploy it or at best have to restart the application. This requires downtime, which sort of defeats the whole purpose of microservices. Does anyone have some suggestion what I could use? Is it possible to use Spring Value, to map values from properties file to the HashMap?

BeanExpressionContext' - maybe not public? NirajSonawane PropertySplitter should be in the classpath and Spring needs to scan it and find it, it's another bean. From Spring 4.

Could you please guide me here : stackoverflow. First I've created the properties file priority-migration. Viktor Stoitschev Viktor Stoitschev 2 2 silver badges 12 12 bronze badges. But is there a way to make this reloadable on runtime? Will the changes be automatically reflected if changes are made to the property file while the application is running? Hi Mayank. The properties won't be reloaded with this example. But you should look into RefreshScope and put it under ConfigurationProperties "my.

Please refer to this article see 4. This should work in theory, but I didn't test it myself. Good luck. Thanks Viktor followed your suggestion finally and we have modified all our services to load configuration using Spring cloud config.

With the actuator refresh end point I am able to reload the properties at run time. Thank you for providing this alernative for those using Spring Boot. It is the recommended way since among other reasons, it allows to inject properties as objects. I find it easier to group cohesive properties together.

This way we can create modular configuration type safe. I make one solution inspired by the previous post. Milan Milan 6 6 silver badges 11 11 bronze badges.

Kevin Mayo 5 5 silver badges 18 18 bronze badges. No, It was just a reminder for everyone else to do not repeat my mistake. Your code works absolutely fine. This is better than the accepted answer. Just what I was looking for! The rest of the suffix is dropped — Abhijit Sarkar.

Show 4 more comments. Deinum M. Deinum k 20 20 gold badges silver badges bronze badges. Paul Phoenix Paul Phoenix 1, 6 6 gold badges 18 18 silver badges 29 29 bronze badges.

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