BAEL-3689: Add missing code examples (#10282)

spring-boot-modules/spring-boot-data/src/main/java/com/baeldung/startup/AppStartupRunner.java

@@ -0,0 +1,21 @@
+package com.baeldung.startup;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.boot.ApplicationArguments;
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+public class AppStartupRunner implements ApplicationRunner {
+
+    private static final Logger LOG = LoggerFactory.getLogger(AppStartupRunner.class);
+    public static int counter;
+
+    @Override
+    public void run(ApplicationArguments args) throws Exception {
+        LOG.info("Application started with option names : {}", args.getOptionNames());
+        LOG.info("Increment counter");
+        counter++;
+    }
+}

spring-boot-modules/spring-boot-data/src/main/java/com/baeldung/startup/CommandLineAppStartupRunner.java

@@ -0,0 +1,19 @@
+package com.baeldung.startup;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+public class CommandLineAppStartupRunner implements CommandLineRunner {
+
+    private static final Logger LOG = LoggerFactory.getLogger(CommandLineAppStartupRunner.class);
+    public static int counter;
+
+    @Override
+    public void run(String... args) throws Exception {
+        LOG.info("Increment counter");
+        counter++;
+    }
+}

spring-boot-modules/spring-boot-data/src/main/java/com/baeldung/startup/SpringStartupConfig.java

@@ -1,9 +1,15 @@
 package com.baeldung.startup;
 
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 
 @Configuration
 @ComponentScan("com.baeldung.startup")
 public class SpringStartupConfig {
+
+    @Bean(initMethod="init")
+    public InitMethodExampleBean initMethodExampleBean() {
+        return new InitMethodExampleBean();
+    }
 }