Small Updates

Author: Ranga Rao Karanam

README.md

@@ -35,7 +35,7 @@ You will learn about
 - Basics of Auto Configuration and Spring Boot Magic
 - Spring Boot Starter Projects
 - Spring Initializr
-- Basic REST Services using Spring Boot Data Web
+- Basic REST Services using Spring Boot Starter Web
 - REST Service Content Negotiation with JSON and XML
 - Embedded servlet containers : Tomcat, Jetty and Undertow
 - Writing Unit and Integration tests using Spring Boot Starter Test

Step01.md

@@ -1,25 +1,14 @@
 ##What You Will Learn during this Step:
 - Set up an Maven Project with Eclipse. 
  - Intellij Link : https://www.jetbrains.com/help/idea/2016.2/getting-started-with-maven.html#create_maven_project
-- Include dependencies needed for Spring Boot.
- - spring-boot-starter-web : starter for building applications with Spring MVC. Tomcat is default embedded container.
- - spring-boot-maven-plugin : Enable running application in-place and also building a jar/war to run later!
+- Copy Two Files pom.xml and Application.java
 - Launch Your First Spring Boot Application.
-
-###Typical stuff done at the start of projects
-- Framework setup
- - Identifying compatible framework versions. for example, Which version of Spring and Hibernate to use?
- - Configuring (Integrating) frameworks
-  - Configuring web.xml, Configuring Dispatcher Servlet
-  - Configuring data source, session factory
-- Logging, Transaction Management, Error Handling  
-- Configuration Management
-- Configuring Servers to deploy applications to
-- Monitoring Applications
+- You will be introduced to Maven
+  - Dependency Management
 
 ##Cool thing to note!
 - Without a lot of configuration, we are up and running with a web application
- - Refer https://github.com/in28minutes/SpringMvcStepByStep/blob/master/Step01.md and https://github.com/in28minutes/SpringMvcStepByStep/blob/master/Step11.md to understand the sort of stuff - web.xml, dispatcher servlet configuration, maven dependency management and plugins - that are need to launch a typical web application without Spring Boot!
+ - Refer https://github.com/in28minutes/SpringMvcStepByStep/blob/master/Step15.md to understand the sort of stuff - web.xml, dispatcher servlet configuration, maven dependency management and plugins - that are need to launch a typical web application without Spring Boot!
 
 ##What You Will NOT Learn during this Step:
 - Spring Boot does a lot of magic. This magic is called Auto Configuration. We will discuss about different terms related to Spring Boot - Starter Parent, Starter projects, Auto configuration - in depth during our first 10 steps.

Step02.md

@@ -1,69 +1,41 @@
 ##What You Will Learn during this Step:
 - Lets add a RestController with a dependency and see Spring Boot Magic live
 
-##Quick Spring and Spring MVC Primer
+##Theory Break : Quick Spring and Spring MVC Primer
 - What is dependency?
 - @Component
 - @Autowired
 - @RestController
 
 ## Useful Snippets and References
 
-First Snippet
-
-```
-    @RestController
-    class SomeBean {
-
-        @Autowired
-        private SomeDependency someDependency;
-
-        @RequestMapping("/")
-        public String index() {
-            return someDependency.getSomething();
-        }
-
-    }
-
-    @Component
-    class SomeDependency {
-
-        public String getSomething() {
-            return "Hello! Welcome!";
-        }
-
-    }
-
-```
 
 ## Files List
 ### /pom.xml
 ```
 <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>
-    <groupId>com.in28minutes</groupId>
-    <artifactId>springboot-for-beginners-example</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <name>Your First Spring Boot Example</name>
-    <packaging>jar</packaging>
-
-    <parent>
-        <groupId>org.springframework.boot</groupId>
-        <artifactId>spring-boot-starter-parent</artifactId>
-        <version>1.4.0.RELEASE</version>
-    </parent>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
-        </dependency>
-    </dependencies>
+	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>
+	<groupId>com.in28minutes.springboot</groupId>
+	<artifactId>first-springboot-project</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
 
     <properties>
         <java.version>1.8</java.version>
     </properties>
+    
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>1.4.0.RELEASE</version>
+	</parent>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+	</dependencies>
 
     <build>
         <plugins>
@@ -73,49 +45,72 @@ First Snippet
             </plugin>
         </plugins>
     </build>
+
 </project>
+
+
+
+
+
+```
+### /src/main/java/com/in28minutes/service/WelcomeService.java
+```
+package com.in28minutes.service;
+
+import org.springframework.stereotype.Component;
+
+//Spring to manage this bean and create an instance of this
+@Component
+public class WelcomeService{
+	public String retrieveWelcomeMessage() {
+		//Complex Method
+		return "Good Morning updated! ";
+	}
+}
 ```
 ### /src/main/java/com/in28minutes/springboot/Application.java
 ```
 package com.in28minutes.springboot;
 
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ApplicationContext;
-import org.springframework.stereotype.Component;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.context.annotation.ComponentScan;
 
 @SpringBootApplication
+@ComponentScan("com.in28minutes")
 public class Application {
 
-    public static void main(String[] args) {
-        ApplicationContext ctx = SpringApplication.run(Application.class, args);
-
-    }
-
-    @RestController
-    class SomeBean {
-
-        @Autowired
-        private SomeDependency someDependency;
-
-        @RequestMapping("/")
-        public String index() {
-            return someDependency.getSomething();
-        }
-
-    }
+	public static void main(String[] args) {
+		ApplicationContext ctx = SpringApplication.run(Application.class, args);
+		for (int i = 0; i < 10; i++)
+			System.out.println("");
+	}
 
-    @Component
-    class SomeDependency {
-
-        public String getSomething() {
-            return "Hello! Welcome!";
-        }
+}
+```
+### /src/main/java/com/in28minutes/springboot/WelcomeController.java
+```
+package com.in28minutes.springboot;
 
-    }
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
 
+import com.in28minutes.service.WelcomeService;
+
+@RestController
+public class WelcomeController {
+		
+	//Auto wiring
+	@Autowired
+	private WelcomeService service;
+	
+	@RequestMapping("/welcome")
+	public String welcome() {
+		return service.retrieveWelcomeMessage();
+	}
 }
-```
+
+```

Step05.md

@@ -1,32 +1,45 @@
 ##What You Will Learn during this Step:
 - Spring Boot vs Spring
 - What Spring Boot is Not!
-- Auto component scan
-- A programming tip
- - Pair Program once in a while!
 
 ##Spring Boot vs Spring
-###Spring
-Spring is just a dependency management framework. Spring focuses on the "plumbing" of enterprise applications so that teams can focus on application-level business logic, without unnecessary ties to specific deployment environments.
+
+### Spring
+- Spring is just a dependency injection framework. Spring focuses on the "plumbing" of enterprise applications so that teams can focus on application-level business logic, without unnecessary ties to specific deployment environments.
+- First half of the 2000 decade! EJBs
+- EJBs were NOT easy to develop. 
+ - Write a lot of xml and plumbing code to get EJBs running
+ - Impossible to Unit Test
+ - Alternative - Writing simple JDBC Code involved a lot of plumbing
+- Spring framework started with aim of making Java EE development simpler. 
  - Goals
   - Make applications testable. i.e. easier to write unit tests
   - Reduce plumbing code of JDBC and JMS
   - Simple architecture. Minus EJB.
   - Integrates well with other popular frameworks.
 
-###My experience with Spring based Applications
-- Developing Spring Based application need configuration of a lot of beans!
-- Integration with other frameworks need configuration as well!
-- Added to these, applications need other features (logging, transaction management, monitoring, configuration management etc) before they can go live!
-- Spring Boot solves these problems
-
-###Spring Boot
-- Spring Boot makes it easy to create stand-alone, production-grade Spring based Applications that you can “just run”. Most Spring Boot applications need very little Spring configuration.
- - Goals
+### Applications with Spring Framework
+- Over the next few years, a number of applications were developed with Spring Framework
+ - Testable but
+ - Lot of configuration (XML and Java)
+  - Developing Spring Based application need configuration of a lot of beans!
+  - Integration with other frameworks need configuration as well!
+- In the last few years, focus is moving from monolith applications to microservices. We need to be able to start project quickly. Minimum or Zero start up time
+ - Framework Setup
+ - Deployment - Configurability
+ - Logging, Transaction Management
+ - Monitoring
+ - Web Server Configuration
+ 
+### Spring Boot
+- Spring Boot makes it easy to create stand-alone, production-grade Spring based Applications that you can “just run”. 
+- We take an opinionated view of the Spring platform and third-party libraries so you can get started with minimum fuss. 
+- Example Problem Statements
+ - You want to add Hibernate to your project. You dont worry about configuring a data source and a session factory. I will do if for you! 
+- Goals
   - Provide quick start for projects with Spring.
   - Be opinionated but provide options.
   - Provide a range of non-functional features that are common to large classes of projects (e.g. embedded servers, security, metrics, health checks, externalized configuration).
-- Absolutely no code generation and no requirement for XML configuration.
 
 ####What Spring Boot is NOT?
 - It’s not an app or a web server