Added code for https://jstobigdata.com/spring/custom-events-and-generic-events-in-spring/

Author: Bikraji

spring-core-events/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <parent>
+    <artifactId>spring-framework-tutorial-parent</artifactId>
+    <groupId>com.jstobigdata</groupId>
+    <version>1.0-SNAPSHOT</version>
+  </parent>
+  <modelVersion>4.0.0</modelVersion>
+
+  <artifactId>spring-core-events</artifactId>
+
+
+</project>

spring-core-events/src/main/java/com/jsbd/events/AnnEventListener.java

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+package com.jsbd.events;
+
+public class AnnEventListener {
+}

spring-core-events/src/main/java/com/jsbd/events/AppConfig.java

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+package com.jsbd.events;
+
+public class AppConfig {
+}

spring-core-events/src/main/java/com/jsbd/events/EventListener.java

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+package com.jsbd.events;
+
+public class EventListener {
+}

spring-core-events/src/main/java/com/jsbd/events/EventPublisher.java

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+package com.jsbd.events.synchronous;
+
+import com.jsbd.events.UserEvent;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.stereotype.Component;
+
+@Component
+public class EventPublisher {
+
+  @Autowired //use setter based injection
+  private ApplicationEventPublisher applicationEventPublisher;
+
+  public void publishEvent(String message, Integer eventId) {
+    applicationEventPublisher.publishEvent(
+        new UserEvent(this, message, eventId )
+    );
+  }
+}

spring-core-events/src/main/java/com/jsbd/events/UserEvent.java

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+package com.jsbd.events;
+
+import org.springframework.context.ApplicationEvent;
+
+import java.util.StringJoiner;
+
+public class CustomAppEvent extends ApplicationEvent {
+
+  //Custom property
+  private String message;
+
+  /**
+   * Create a new {@code ApplicationEvent}.
+   * @param source the object on which the event initially occurred or with
+   *               which the event is associated (never {@code null})
+   */
+  public CustomAppEvent(Object source) {
+    super(source);
+  }
+
+  /**
+   * Constructor to set the properties.
+   * @param source
+   * @param message
+   */
+  public CustomAppEvent(Object source, String message) {
+    super(source);
+    this.message = message;
+  }
+
+  public String getMessage() {
+    return message;
+  }
+
+  @Override
+  public String toString() {
+    return new StringJoiner(", ", CustomAppEvent.class.getSimpleName() + "[", "]")
+        .add("message='" + message + "'")
+        .add("source=" + source)
+        .toString();
+  }
+}

spring-core-events/src/main/java/com/jsbd/events/generic/GenericEventListener.java

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+package com.jsbd.events.generic;
+
+public class GenericEventListener {
+}

spring-core-events/src/main/java/com/jsbd/events/generic/Person.java

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+package com.jsbd.events.generic;
+
+public class Person {
+}

spring-core-events/src/test/java/com/jsbd/events/synchronous/EventPublisherTest.java

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+import static org.junit.jupiter.api.Assertions.*;
+
+class EventPublisherTest {
+
+}

spring-core-events/src/test/java/com/jsbd/events/synchronous/GenericEventTest.java

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+package com.jsbd.events.synchronous;
+
+public class GenericEventTest {
+}