@Value not resolved when using @PropertySource annotation. How to configure PropertySourcesPlaceholderConfigurer?

Question

I have following configuration class:

@Configuration
@PropertySource(name = \"props\", value = \"classpath:/app-config.properties\")
@ComponentScan(\"service         


        

Answer 1

Since Spring 4.3 RC2 using PropertySourcesPlaceholderConfigurer or is not needed anymore. We can use directly @PropertySource with @Value. See this Spring framework ticket

I have created a test application with Spring 5.1.3.RELEASE. The application.properties contains two pairs:

app.name=My application
app.version=1.1

The AppConfig loads the properties via @PropertySource.

package com.zetcode.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

@Configuration
@PropertySource(value = "application.properties", ignoreResourceNotFound = true)
public class AppConfig {

}

The Application injects the properties via @Value and uses them.

package com.zetcode;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;

@ComponentScan(basePackages = "com.zetcode")
public class Application {

    private static final Logger logger = LoggerFactory.getLogger(Application.class);

    @Value("${app.name}")
    private String appName;

    @Value("${app.version}")
    private String appVersion;

    public static void main(String[] args) {

        var ctx = new AnnotationConfigApplicationContext(Application.class);
        var app = ctx.getBean(Application.class);

        app.run();

        ctx.close();
    }

    public void run() {

        logger.info("Application name: {}", appName);
        logger.info("Application version: {}", appVersion);
    }
}

The output is:

$ mvn -q exec:java
22:20:10.894 [com.zetcode.Application.main()] INFO  com.zetcode.Application - Application name: My application
22:20:10.894 [com.zetcode.Application.main()] INFO  com.zetcode.Application - Application version: 1.1