![]() Application. Firstly we will add below values in application.properties file of our project. ![]() If you are in new spring boot and then i will recommencement to you first read how create project in Spring boot. Resource resource new ClassPathResource('classpath:data.txt') File file resource.getFile() String content new String(Files.readAllBytes(file.toPath())) To read a file from inside. Now we see how to read properties file in spring using annotation Value. It recognizes the properties, it runs Spring, it recognizes the key, but it just doesn't use it. We can pass the file path along with the prefix to the constructor of a resource class, and Spring will automatically load it for us. I even created the whole project from scratch to see if something had gotten tangled up while I tried to solve it. Configuring the pom, project structure, run configurations, adding settings, and more. It's hard to list all attempts I've made, but I've tried everything I've seen. I have exhausted all suggestions I've found online, and nothing works. It seems to be centered around that isn't passed, although Spring Boot works in every other regard. The element of focus is the Value annotation that can be used on class fields or method arguments it also instructs Spring to automatically inject the. If I write the key as a string instead of using it reads it and everything works like it should. If I run mvn spring-boot:run, everything executes perfectly like it should, except the api-key is left null. ![]() This can be used at field level, parameters level of constructor and method. Even if I go to application.properties and use "Find usages" on the api.key, it shows the right place in the code where it is used. Value annotation can be used for injecting default values. Import class M圜onfig String M圜lass getKey() is the key from application.properties, but on run time, it doesn't use it, and I get a 401 error (because the field is null). The value market with isn't getting passed during run time.
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