Add spring boot metrics

spring-security-rest-full/src/main/java/org/baeldung/web/metric/MetricFilter.java

@@ -9,13 +9,15 @@ import javax.servlet.ServletResponse;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
+import org.springframework.web.context.support.WebApplicationContextUtils;
+
 public class MetricFilter implements Filter {
 
     private MetricService metricService;
 
     @Override
     public void init(final FilterConfig config) throws ServletException {
-        metricService = new MetricService();
+        metricService = (MetricService) WebApplicationContextUtils.getRequiredWebApplicationContext(config.getServletContext()).getBean("metricService");
     }
 
     @Override

spring-security-rest-full/src/main/java/org/baeldung/web/metric/MetricService.java

@@ -11,13 +11,16 @@ import org.springframework.stereotype.Service;
 @Service
 public class MetricService {
 
-    private static HashMap<String, HashMap<Integer, Integer>> metricMap = new HashMap<String, HashMap<Integer, Integer>>();
-    private static HashMap<Integer, Integer> statusMetric = new HashMap<Integer, Integer>();
-    private static HashMap<String, HashMap<Integer, Integer>> timeMap = new HashMap<String, HashMap<Integer, Integer>>();
+    private HashMap<String, HashMap<Integer, Integer>> metricMap;
+    private HashMap<Integer, Integer> statusMetric;
+    private HashMap<String, HashMap<Integer, Integer>> timeMap;
     private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
 
     public MetricService() {
         super();
+        metricMap = new HashMap<String, HashMap<Integer, Integer>>();
+        statusMetric = new HashMap<Integer, Integer>();
+        timeMap = new HashMap<String, HashMap<Integer, Integer>>();
     }
 
     public void increaseCount(final String request, final int status) {