Simple demonstration of using Static blocks in Java

StaticBlock.java

package testcache;

public class StaticBlock {

	static String prometheusUrl = null;
	static String billing_service_name = null;
	static {

		prometheusUrl = System.getenv("PROMETHEUS_URL");
		if (prometheusUrl == null) {
			prometheusUrl = "http://prom-prometheus-operator-prometheus.monitoring:9090/api/v1/query?/";
		}   		

		bem_service_name = System.getenv("BILLING_SERVICE_NAME");
		if (bem_service_name == null) {
			billing_service_name = "billingmanager";
		}
		
		System.out.println("prometheusUrl: " + prometheusUrl );
		System.out.println("billing_service_name : "+ billing_service_name);
	}

	public static void main(String[] args) {
		
		System.out.println("Main executed!");
		
	}

}