Java – from application Properties spring boot read value

My spring launch application has the following application bindings

> src

>Main

>Java > resources

> application. properties

This is my application Properties file:

logging.level.org.springframework=TRACE
logging.level.org.hibernate=ERROR
spring.resources.chain.strategy.content.enabled=true
spring.resources.chain.strategy.content.paths=/**
#spring.resources.chain.cache=false
#spring.resources.chain.html-application-cache=false
#spring.headers.cache=false
language=java

I have a class that needs to use the language = Java attribute That's how I try to use it:

public class EntityManager {

    @Value("${language}")
    private static String newLang;

    public EntityManager(){
        System.out.println("langauge is: " + newLang);
    }
}

For some reason, the print value is always "null"! I've also tried to put it on top of class declarations:

@PropertySource(value = "classpath:application.properties")

Solution

It can be implemented in many ways, see below

@Configuration
@PropertySource("classpath:application.properties")
public class EntityManager {

    @Value("${language}")
    private static String newLang;

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertyConfigInDev() {
        return new PropertySourcesPlaceholderConfigurer();
    }

}

or

@Configuration
@PropertySource("classpath:application.properties")
public class EntityManager {

    @Autowired
    private Environment env;

    public void readproperty() {
        env.getProperty("language");
    }

}