[BAEL-3348] Moved code to algorithm-4

spring-mvc-java/src/main/java/com/baeldung/events/FooCreationEvent.java

@@ -0,0 +1,10 @@
+package com.baeldung.events;
+
+import org.springframework.context.ApplicationEvent;
+
+public class FooCreationEvent extends ApplicationEvent {
+
+    public FooCreationEvent(Object source) {
+        super(source);
+    }
+}

spring-mvc-java/src/main/java/com/baeldung/events/FooCreationEventListener.java

@@ -0,0 +1,17 @@
+package com.baeldung.events;
+
+import org.springframework.context.ApplicationListener;
+import org.springframework.stereotype.Component;
+
+import java.util.logging.Logger;
+
+@Component
+public class FooCreationEventListener implements ApplicationListener<FooCreationEvent> {
+
+    private static Logger logger = Logger.getLogger(FooCreationEventListener.class.getName());
+
+    @Override
+    public void onApplicationEvent(FooCreationEvent event) {
+        logger.info("Created foo instance: " + event.getSource().toString());
+    }
+}