BAEL-20881: Move spring-boot-performance into spring-boot-modules

spring-boot-modules/spring-boot-performance/README.md

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+## Spring Boot Performance
+
+This module contains articles about Spring Boot performance.
+
+### Relevant Articles
+
+- [Lazy Initialization in Spring Boot 2](https://www.baeldung.com/spring-boot-lazy-initialization)

spring-boot-modules/spring-boot-performance/pom.xml

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+<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">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>spring-boot-performance</artifactId>
+    <name>spring-boot-performance</name>
+    <packaging>war</packaging>
+    <description>This is a simple Spring Boot application taking advantage of the latest Spring Boot improvements/features. Current version: 2.2</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-2</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>spring-boot-performance</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-war-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <!-- The main class to start by executing java -jar -->
+        <start-class>com.baeldung.lazyinitialization.Application</start-class>
+    </properties>
+</project>

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

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+package com.baeldung.lazyinitialization;
+
+import com.baeldung.lazyinitialization.services.Writer;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class Application {
+
+    @Bean("writer1")
+    public Writer getWriter1() {
+        return new Writer("Writer 1");
+    }
+
+    @Bean("writer2")
+    public Writer getWriter2() {
+        return new Writer("Writer 2");
+    }
+
+    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);
+        writer1.write("First message");
+
+        Writer writer2 = ctx.getBean("writer2", Writer.class);
+        writer2.write("Second message");
+    }
+}

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

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+package com.baeldung.lazyinitialization.services;
+
+public class Writer {
+
+    private final String writerId;
+
+    public Writer(String writerId) {
+        this.writerId = writerId;
+        System.out.println(writerId + " initialized!!!");
+    }
+
+    public void write(String message) {
+        System.out.println(writerId + ": " + message);
+    }
+
+}

spring-boot-modules/spring-boot-performance/src/main/resources/application.yml

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+spring:
+  main:
+    lazy-initialization: true