Static Field Injection In Spring

Injecting static fields in a spring bean doesn’t work by simply adding @Autowired annotation as below.

@Component
public class MessageHelper {
    @Autowired
    private static MessageBean messageBean;

    public static void msg() {
        messageBean.display();
    }
}

It works either by having constructor or setter based injection.

@Component
public class MessageHelper {
    private static MessageBean messageBean;

    @Autowired
    private void setMessageBean(MessageBean messageBean) {
        MessageHelper.messageBean = messageBean;
    }

    public static void msg() {
        messageBean.display();
    }

}

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