如何从命令行读取值并在自举注释配置类中使用它们来定义spring bean？

Question

i have my main class as below.

public static void main(String[] args) {
    AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
    SimpleCommandLinePropertySource cmdLineSrc = new SimpleCommandLinePropertySource(args);     
    ctx.getEnvironment().getPropertySources().addFirst(cmdLineSrc);
    ctx.register(MyConfig.class);

    ctx.refresh();
    ctx.start();

    MyClass myclass = ctx.getBean(MyClass.class);
    // do something...
}

now in my MyApp.config, i have following..

@Autowired
Environment env;

however, when i try to get values out, i get NPE.

env.getProperty("something");

what am i missing here? I do have @PropertySource as below (which works fine), but could that cause any issues here?

@Configuration
@PropertySource({ "classpath:my.properties" })
public class MyConfig {

    @Autowired
    private Environment env;    

Answer 1

@PropertySource declaration was overriding environment variables in my @Configuration class. i removed it and i was able to retrieve values i entered in command line.