Spring Inject value into static variables

Spring doesn’t allow to inject value into static variables, for example:

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class GlobalValue {
	@Value("${mongodb.db}")
    public static String DATABASE;

If you print out the GlobalValue.DATABASE, a null will be displayed.

	GlobalValue.DATABASE = null

Solution

To fix it, create a “none static setter” to assign the injected value for the static variable. For example :

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class GlobalValue {
    public static String DATABASE;
    @Value("${mongodb.db}")
    public void setDatabase(String db) {
        DATABASE = db;

Output

	GlobalValue.DATABASE = "mongodb database name"