CODEWITHSUNDEEP
javaspringspring-bootyaml
Devas
Devas

Reputation: 1694

SpringBootApplication failed to load properties from application.yml file

Configuration class,

@Configuration
public class SpringContext {
@Bean
public BlockingQueue<String> queue(@Value("${queue.size}") int queueSize) {
    return new LinkedBlockingQueue<>();
   }
}

Main class,

@SpringBootApplication
public class SpringContextTest {

    public static void main(String[] args) {
        final SpringApplication springApplication = new SpringApplication(SpringContext.class);
        springApplication.setWebEnvironment(false);
        springApplication.run();
        System.out.println("queue.size" + System.getProperty("queue.size"));
    }

}

application.yml,

queue.size: 10

While starting the main class I'm getting the following error,

Caused by: java.lang.NumberFormatException: For input string: "${queue.size}"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) ~[na:1.8.0_144]

I'm I missing some annotations ?, In my understanding I've used the minimal annotations required for a spring boot application. I have seen some similar posts but didn't helped. Also tried with --spring.config.location.

My Spring starter version: 1.3.6.RELEASE

Upvotes: 7

Views: 12590

Answers (3)

Tony
Tony

Reputation: 6148

Guesses

According to the current information you provides, I can't re-produce the problem, so the following is just some guesses:

  • Check whether file name and file location of application.yml is right;

  • Try use Spring EL: 

    @Value("#{applicationConfig['queue.size']}")

  • Try debug property loading:

    @Bean
public BlockingQueue<String> queue(ConfigurableEnvironment env) {
  return new LinkedBlockingQueue<>(); // set breakpoint here, to see if env has your property in PropertySource: applicationConfig
}

More

More about property source and yaml loading in my blog.

Further

If the suggestions not help, you may better

  • provide a sample project that can re-produce problem;
  • provide complete stacktrace;

Upvotes: 1

pleft
pleft

Reputation: 7905

Your config file looks more like an application.properties rather than an application.yml

queue.size: 10

The equivalent yml should be:

queue:
    size: 10

UPDATE

Yes both should work in .yml you are right. I replicated exactly your example and it worked!

Just make sure you application.yml file is in the root of the src/main/resources/. I had the same error as yours when I had the application.yml file in a subdirectory e.g. src/main/resources/com/myapp/

Upvotes: 3

Manoj Janaka
Manoj Janaka

Reputation: 180

The Externalized Configuration section of the Spring Boot docs, explains all the details that you might need.

As per your example to load properties in the main class you can do something like this,

  1. First double check the location of the yaml file, It should be located in /src/main/resources/application.yaml

  2. The content should be like the following example,

    app:
    value1: 12
    value2: stringValue

  3. Sample code,

    package com.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.core.env.Environment;

@SpringBootApplication
public class App {


    public static void main( String[] args ){
    SpringApplication app = new SpringApplication(App.class);
    Environment env = app.run(args).getEnvironment();

    String value1 = env.getProperty("app.value1");
    String value2 = env.getProperty("app.value2");

    System.out.println("---------------- "+value1);
    System.out.println("---------------- "+value2);

}

    

}

Upvotes: 1

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