BAEL-4912: Set lazy initialization using SpringApplication and SpringApplicationBuilder (#10617)

Co-authored-by: Krzysztof Woyke <krzysztof.woyke.sp@lhsystems.com>

spring-boot-modules/spring-boot-performance/src/main/java/com/baeldung/lazyinitialization/Application.java

@@ -3,6 +3,7 @@ package com.baeldung.lazyinitialization;
 import com.baeldung.lazyinitialization.services.Writer;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 
@@ -20,7 +21,9 @@ public class Application {
     }
 
     public static void main(String[] args) {
+
         ApplicationContext ctx = SpringApplication.run(Application.class, args);
+
         System.out.println("Application context initialized!!!");
 
         Writer writer1 = ctx.getBean("writer1", Writer.class);
@@ -29,4 +32,23 @@ public class Application {
         Writer writer2 = ctx.getBean("writer2", Writer.class);
         writer2.write("Second message");
     }
+
+    /*
+    This method shows how to set lazy initialization and start the application using SpringApplicationBuilder
+     */
+    private static ApplicationContext runUsingSpringApplicationBuilder(String[] args){
+        return new SpringApplicationBuilder(Application.class)
+                .lazyInitialization(true)
+                .build(args)
+                .run();
+    }
+
+    /*
+    This method shows how to set lazy initialization and start the application using SpringApplication
+     */
+    private static ApplicationContext runUsingSpringApplication(String[] args){
+        SpringApplication app = new SpringApplication(Application.class);
+        app.setLazyInitialization(true);
+        return app.run(args);
+    }
 }