From 56d8b18948eaf8a3f1134953448b848ebabfe0ca Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Wed, 21 Aug 2024 17:20:42 -0400
Subject: [PATCH 01/11] Rough Spring Article Start

---
 backend/spring/README.md | 339 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 339 insertions(+)
 create mode 100644 backend/spring/README.md

diff --git a/backend/spring/README.md b/backend/spring/README.md
new file mode 100644
index 0000000..973c669
--- /dev/null
+++ b/backend/spring/README.md
@@ -0,0 +1,339 @@
+# Gen Topics
+- IoC containers (Inversion of Control)
+- Data access framework
+- Dependency injections
+    - Injecting object dependencies
+
+- Maven
+    - Maven Project, Maven archetypes
+    - Group ID / Artifact ID
+    - pom.xml file
+    - Maven repository for xml dependencies
+
+Achieving dependency injections through configuration
+- XML configuration (using Component)
+    ex.
+    App.java
+    public class App {
+        public static void main(String[] args) {
+            ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
+
+            Vehicle obj = (Vehicle)context.getBean("vehicle");
+            obj.drive();
+        }
+    }
+    spring.xml (in src)
+    <?xml version="1.0" encoding="UTF-8"?>
+
+    <beans [xml custom tag definition here, can find on spring website]>
+        <bean id="vehicle" class="com.navin.Telusko.Car"></bean>
+    </beans>
+
+- Annotation based configuration * (Components, Autowired)
+    ex.
+    App.java
+    public class App {
+        public static void main(String[] args) {
+            ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
+
+            Vehicle obj = (Vehicle)context.getBean("car");
+            obj.drive();
+        }
+    }
+    spring.xml (in src)
+    <?xml version="1.0" encoding="UTF-8"?>
+
+    <beans [xml custom tag definition here, can find on spring website]>
+       <context:component-scan base-package='com.navin.Telusko'></context:component-scan> 
+    </beans>
+
+    Car.java
+    package com.navin.Telusko;
+    @Component // <- important
+    public class Car implements Vehicle {
+        public void drive() {
+            System.out.println("driving");
+        }
+    }
+
+- Combo Annotation & Xml w/ Bean property tags
+    ex.
+    App.java
+    public class App {
+        public static void main(String[] args) {
+            ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
+
+            Tire t = (Tire) context.getBean("tire");
+            System.out.println(t);
+        }
+    }
+    spring.xml (in src)
+    <?xml version="1.0" encoding="UTF-8"?>
+
+    <beans [xml custom tag definition here, can find on spring website]>
+       <context:component-scan base-package='com.navin.Telusko'></context:component-scan> 
+        // Xml formatting to accomodate tire
+       <bean id="tire" class="com.navin.Telusko.Tire">
+            <property name="brand" value="MRF"></property>
+       </bean>
+    </beans>
+
+    Car.java
+    package com.navin.Telusko;
+
+    @Component // <- important
+    public class Car implements Vehicle {
+        public void drive() {
+            System.out.println("driving");
+        }
+    }
+
+    Tire.java
+    package com.navin.Telusko;
+
+    public class Tire {
+        private String brand;
+
+        public String getBrand() {
+            return brand;
+        }
+
+        public void setBrand(String brand) {
+            this.brand= brand;
+        }
+
+        @Override
+        public String toString() {
+            return "Tire [brand=" + brand + "]";
+        }
+    }
+
+- Constructor Injection (Still mixed Annotation and Xml Config) & Autowired
+    ex.
+    App.java
+    public class App {
+        public static void main(String[] args) {
+            ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
+
+            Car obj = (Car)context.getBean("car");
+            obj.drive();
+        }
+    }
+    spring.xml (in src)
+    <?xml version="1.0" encoding="UTF-8"?>
+
+    <beans [xml custom tag definition here, can find on spring website]>
+       <context:component-scan base-package='com.navin.Telusko'></context:component-scan> 
+        // Xml formatting to accomodate tire
+       <bean id="tire" class="com.navin.Telusko.Tire">
+            <constructor-arg value="MRF"></constructor-arg>
+       </bean>
+    </beans>
+
+    Car.java
+    package com.navin.Telusko;
+
+    @Component // <- important
+    public class Car implements Vehicle {
+
+        @Autowired
+        private Tire tire;
+
+        public Tire getTire() {
+            return tire
+        }
+
+        public void setTire(Tire tire) {
+            this.tire = tire;
+        }
+
+        public void drive() {
+            System.out.println("car" + tire);
+        }
+    }
+
+    Tire.java
+    package com.navin.Telusko;
+
+    @Component
+    public class Tire {
+        private String brand;
+
+        public Tire(String brand) {
+            super();
+            this.brand = brand;
+        }
+
+        public String getBrand() {
+            return brand;
+        }
+
+        public void setBrand(String brand) {
+            this.brand= brand;
+        }
+
+        @Override
+        public String toString() {
+            return "Tire [brand=" + brand + "]";
+        }
+    }
+
+- Annotation Confirguation using Maven (New Example)
+    1. Create Maven project (Quick start maven archetype)
+    2. Add dependencies to pom.xml from Maven Repository
+        - Spring context copy and paste
+    Samsung.java
+    package com.telusko.SpringAnno;
+
+
+    public class Samsung {
+
+        @Autowired // checks by type
+        MobileProcessor cpu;
+
+        public MobileProcessor getCpu() {
+            return cpu;
+        }
+
+        public void setCpu(MobileProcessor cpu) {
+            this.cpu = cpu;
+        }
+
+        public void config() {
+            System.out.println("Octa Core, 4 gb Ram, 12MP camera");
+            cpu.process();
+        }
+    }
+
+    App.java
+    package com.telusko.SpringAnno;
+
+    public class App {
+        public static void main(String[] args) {
+            ApplicationContext factory = new AnnotationConfigApplicationContext(AppConfig.class);
+
+            Samsung s7 = factory.getBean(Samsung.class);
+            s7.config();
+        }
+    }
+
+    AppConfig.java
+    package com.telusko.SpringAnno;
+
+    // import statements auto inserted here
+
+    @Configuration
+    public class AppConfig {
+
+        @Bean
+        public Samsung getPhone() {
+            return new Samsung();
+        }
+        @Bean
+        public MobileProcessor getProcessor() {
+            return new Snapdragon();
+        }
+
+    }
+
+    MobileProcessor.java
+    package com.telusko.SpringAnno;
+
+    public interface MobileProcessor {
+        void process();
+    }
+
+    Snapdragon.java
+    package com.telusko.SpringAnno;
+
+    public class Snapdragon implements MobileProcessor {
+        public void process() {
+            System.out.println("Word's best CPU");
+        }
+    }
+- Annotation Component (AutoWird Primary Qualifier)
+    1. Add Component tags to Samsung and Snapdragon
+    2. Add ComponentScan to AppConfig to find components (it looks by type)
+        - defaults to class name decapitalized (Samsung->samsung)
+        - With multiple components, you can define a primary (@Primary) or a qualifier (@Qualifier("id"))
+        - 
+    Samsung.java
+    package com.telusko.SpringAnno;
+
+    @Component
+    public class Samsung {
+
+        @Autowired // checks by type
+        @Qualifier("snapdragon")
+        MobileProcessor cpu;
+
+        public MobileProcessor getCpu() {
+            return cpu;
+        }
+
+        public void setCpu(MobileProcessor cpu) {
+            this.cpu = cpu;
+        }
+
+        public void config() {
+            System.out.println("Octa Core, 4 gb Ram, 12MP camera");
+            cpu.process();
+        }
+    }
+
+    App.java
+    package com.telusko.SpringAnno;
+
+    // Spring Core Annotations
+    public class App {
+        public static void main(String[] args) {
+            ApplicationContext factory = new AnnotationConfigApplicationContext(AppConfig.class);
+
+            Samsung s7 = factory.getBean(Samsung.class);
+            s7.config();
+        }
+    }
+
+    AppConfig.java
+    package com.telusko.SpringAnno;
+
+    // import statements auto inserted here
+
+    @Configuration
+    @ComponentScan(basePackages="com.telusko.SpringAnno")
+    public class AppConfig {
+
+    }
+
+    MobileProcessor.java
+    package com.telusko.SpringAnno;
+
+    public interface MobileProcessor {
+        void process();
+    }
+
+    Snapdragon.java
+    package com.telusko.SpringAnno;
+
+    // importing Component
+
+    @Component
+    @Primary
+    public class Snapdragon implements MobileProcessor {
+        public void process() {
+            System.out.println("Word's best CPU");
+        }
+    }
+
+    MediaTek.java
+    package com.telusko.SpringAnno;
+
+    // importing Component
+
+    @Component
+    public class MediaTek implements MobileProcessor {
+        public void process() {
+            System.out.println("2nd best CPU");
+        }
+    }
+

From be7652985e9aee643703fa0d61287d84698c668f Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Wed, 21 Aug 2024 21:20:57 -0400
Subject: [PATCH 02/11] Update README.md

---
 backend/spring/README.md | 87 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index 973c669..edc827b 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -1,3 +1,36 @@
+## IoC
+Inversion of control (IoC) is a **principle** where the control of creating objects (in this case) is given to something (Ex. Spring Framework) other than the developer. In Spring this is done through a **design pattern** called dependency injection
+
+## DI
+Dependency injection in Spring 
+- Constructor injection
+- Setter injection
+- Field injection (Not recommended)
+    - Loose coupling (code for interfaces)
+
+## Coupling
+Coupling: How much work is involved in changing something?
+- Tightly coupled: Engine to a car, Computer to your house (harder to move)
+- Loosely coupled: Tire to a car, laptop to your house (can take anywhere)
+* In software, loosely coupled is often better as code is always changing and iterating to better versions
+
+Tightly coupled code:
+SuperMario mario = new SuperMario();
+GameRunner runner = new GameRunner(mario);
+// GameRunner can only run mario games, and code needs to be changed within GamerRunner to run others
+
+Loosely coupled code:
+* GamingConsole is an interface
+GameingConsole game1 = new SuperMario();
+GameingConsole game2 = new PacMan();
+GameRunner runner = new GameRunner(game1);
+GameRunner runner = new GameRunner(game2);
+// Because all games must implement the GameingConsole interface, GameRunner can accept any GameingConsole object in the constructor
+
+Tutorial References (Highly recommend watching!)
+- https://www.youtube.com/watch?v=f6DHAgL7FWc (More beginner friendly, decent examples)
+- https://www.youtube.com/watch?v=If1Lw4pLLEo (Fast, comprehensive, good examples)
+
 # Gen Topics
 - IoC containers (Inversion of Control)
 - Data access framework
@@ -337,3 +370,57 @@ Achieving dependency injections through configuration
         }
     }
 
+### Another Example of implementing Spring -> Hello World Application
+
+App.java
+package ...
+
+imports
+
+public class App {
+    public static void main(String[] args) {
+        // 1: Launch a Spring Context
+
+        var context = new AnnotationConfigApplicationContext(AppConfig.class)
+
+        // 2: Configure the things we want Spring to manage - @Configuration
+        System.out.println(context.getBean("name")); // Returns "Jenn"
+        System.out.println(context.getBean("address")) // Returns error, we renamed address -> address2
+
+        System.out.println(context.getBean(Address.class)) // Can use type of Bean
+        
+        
+    }
+}
+
+AppConfig.java
+package ...
+
+imports
+
+record Person (String name, int age) {};
+record Address (String firstLine, String city) {};
+
+public class AppConfig {
+
+    @Bean
+    public String name() {
+        return "Jenn";
+    }
+    @Bean
+    public int age() {
+        return 15;
+    }
+
+    @Bean
+    public Person person() {
+        var person = new Person("Jack", 18);
+        return person;
+    }
+
+    @Bean(name = "address2")
+    public Address address() {
+        return new Address("Baker Street", "London");
+    }
+
+}
\ No newline at end of file

From fe25d1f8bfe95094403ecd8fe9f5646a5a8bc524 Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Wed, 21 Aug 2024 21:24:13 -0400
Subject: [PATCH 03/11] Update README.md

---
 backend/spring/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index edc827b..bada7e6 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -29,7 +29,7 @@ GameRunner runner = new GameRunner(game2);
 
 Tutorial References (Highly recommend watching!)
 - https://www.youtube.com/watch?v=f6DHAgL7FWc (More beginner friendly, decent examples)
-- https://www.youtube.com/watch?v=If1Lw4pLLEo (Fast, comprehensive, good examples)
+- https://www.youtube.com/watch?v=If1Lw4pLLEo (Fast, comprehensive, good examples) [Also has a more recentt playlist making an example project with Spring and Springboot]
 
 # Gen Topics
 - IoC containers (Inversion of Control)

From 78fba03c536c220538152ef44c489eef6c113e84 Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Wed, 21 Aug 2024 22:18:06 -0400
Subject: [PATCH 04/11] Update README.md

---
 backend/spring/README.md | 76 +++++++++++++++++++++++++++-------------
 1 file changed, 51 insertions(+), 25 deletions(-)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index bada7e6..bd5ce6e 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -1,3 +1,9 @@
+# Spring Overview
+This overview was created from notes following 2 youtube tutorials (links provided later in the article) and Spring tutorial articles
+
+## Prerequisites
+- Must have a solid understanding of Java and OOP (particularly interfaces)
+
 ## IoC
 Inversion of control (IoC) is a **principle** where the control of creating objects (in this case) is given to something (Ex. Spring Framework) other than the developer. In Spring this is done through a **design pattern** called dependency injection
 
@@ -27,9 +33,26 @@ GameRunner runner = new GameRunner(game1);
 GameRunner runner = new GameRunner(game2);
 // Because all games must implement the GameingConsole interface, GameRunner can accept any GameingConsole object in the constructor
 
+## Spring Container/Context (IoC Container)
+(is within JVM [Java Virutal Machine])
+- Manages Spring beans & their lifecycle
+- Bean Factory: Basic Spring Container (Not really used)
+- **Application Context**: Advanced Spring Container w/ enterprise-specific features
+    - Good for web apps, web services, REST API, and microservices
+    - Easy internationalization
+    - Easy integration with Spring AOP (Aspect oriented programming)
+
+### POJO: Plain Old Java Object
+- No constraints
+- Any Java Object is a POJO
+
+### Spring Bean: Any Java Object managed by Spring
+- Spring uses IoC Container (Ex. Application Context) to manage these objects
+
 Tutorial References (Highly recommend watching!)
-- https://www.youtube.com/watch?v=f6DHAgL7FWc (More beginner friendly, decent examples)
+- https://www.youtube.com/watch?v=f6DHAgL7FWc (More beginner friendly, decent examples, not as concise)
 - https://www.youtube.com/watch?v=If1Lw4pLLEo (Fast, comprehensive, good examples) [Also has a more recentt playlist making an example project with Spring and Springboot]
+I watched the 2nd one first, and put the 1st on 1.5x to review.
 
 # Gen Topics
 - IoC containers (Inversion of Control)
@@ -43,8 +66,8 @@ Tutorial References (Highly recommend watching!)
     - pom.xml file
     - Maven repository for xml dependencies
 
-Achieving dependency injections through configuration
-- XML configuration (using Component)
+### Achieving dependency injections through configuration
+#### XML configuration (using Component)
     ex.
     App.java
     public class App {
@@ -62,7 +85,7 @@ Achieving dependency injections through configuration
         <bean id="vehicle" class="com.navin.Telusko.Car"></bean>
     </beans>
 
-- Annotation based configuration * (Components, Autowired)
+#### Annotation based configuration * (Components, Autowired)
     ex.
     App.java
     public class App {
@@ -89,7 +112,7 @@ Achieving dependency injections through configuration
         }
     }
 
-- Combo Annotation & Xml w/ Bean property tags
+#### Combo Annotation & Xml w/ Bean property tags
     ex.
     App.java
     public class App {
@@ -141,7 +164,7 @@ Achieving dependency injections through configuration
         }
     }
 
-- Constructor Injection (Still mixed Annotation and Xml Config) & Autowired
+#### Constructor Injection (Still mixed Annotation and Xml Config) & Autowired
     ex.
     App.java
     public class App {
@@ -211,7 +234,7 @@ Achieving dependency injections through configuration
         }
     }
 
-- Annotation Confirguation using Maven (New Example)
+#### Annotation Confirguation using Maven (New Example)
     1. Create Maven project (Quick start maven archetype)
     2. Add dependencies to pom.xml from Maven Repository
         - Spring context copy and paste
@@ -284,7 +307,7 @@ Achieving dependency injections through configuration
             System.out.println("Word's best CPU");
         }
     }
-- Annotation Component (AutoWird Primary Qualifier)
+#### Annotation Component (AutoWird Primary Qualifier)
     1. Add Component tags to Samsung and Snapdragon
     2. Add ComponentScan to AppConfig to find components (it looks by type)
         - defaults to class name decapitalized (Samsung->samsung)
@@ -380,10 +403,15 @@ imports
 public class App {
     public static void main(String[] args) {
         // 1: Launch a Spring Context
+        try(var context = new AnnotationConfigApplicationContext(AppConfig.class)) {
+            // 2: Configure the things we want Spring to manage - @Configuration
+            context.getBean(GamingConsole.class).up();
 
-        var context = new AnnotationConfigApplicationContext(AppConfig.class)
+            context.getBean(GameRunner.class).run();
+        }
+        
 
-        // 2: Configure the things we want Spring to manage - @Configuration
+        
         System.out.println(context.getBean("name")); // Returns "Jenn"
         System.out.println(context.getBean("address")) // Returns error, we renamed address -> address2
 
@@ -404,23 +432,21 @@ record Address (String firstLine, String city) {};
 public class AppConfig {
 
     @Bean
-    public String name() {
-        return "Jenn";
-    }
-    @Bean
-    public int age() {
-        return 15;
+    public GamingConsole game() {
+        var game = new PacmanGame();
+        return game;
     }
 
     @Bean
-    public Person person() {
-        var person = new Person("Jack", 18);
-        return person;
-    }
+    public GameRunner gameRunner(GamingConsole game) {
+        var gameRunner = new GameRunner(game);
+        return game;
+    } // Can also change new GameRunner(game) -> new GameRunner(game()) with no parameters
+}
 
-    @Bean(name = "address2")
-    public Address address() {
-        return new Address("Baker Street", "London");
-    }
+## Tips
 
-}
\ No newline at end of file
+#### List all Spring Beans
+// Prints the list out to System, the :: is a method reference
+// Some internal Spring Beans will be listed alongside your own defined Beans
+Arrays.stream(context.getBeanDefinitionNames()).forEach(System.out::println);
\ No newline at end of file

From 19a33303c5763443251d3cdaab21d05afb096294 Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Wed, 21 Aug 2024 22:20:30 -0400
Subject: [PATCH 05/11] Update README.md

---
 backend/spring/README.md | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index bd5ce6e..9384c82 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -449,4 +449,9 @@ public class AppConfig {
 #### List all Spring Beans
 // Prints the list out to System, the :: is a method reference
 // Some internal Spring Beans will be listed alongside your own defined Beans
-Arrays.stream(context.getBeanDefinitionNames()).forEach(System.out::println);
\ No newline at end of file
+Arrays.stream(context.getBeanDefinitionNames()).forEach(System.out::println);
+
+## More Resources
+- https://www.javatpoint.com/spring-tutorial
+- https://www.baeldung.com/spring-tutorial
+- https://www.geeksforgeeks.org/spring/

From b899bfec930e393516f3c2c507448b5f5fc75d82 Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Wed, 21 Aug 2024 22:33:48 -0400
Subject: [PATCH 06/11] Update README.md

---
 backend/spring/README.md | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index 9384c82..1c5b9a8 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -7,8 +7,7 @@ This overview was created from notes following 2 youtube tutorials (links provid
 ## IoC
 Inversion of control (IoC) is a **principle** where the control of creating objects (in this case) is given to something (Ex. Spring Framework) other than the developer. In Spring this is done through a **design pattern** called dependency injection
 
-## DI
-Dependency injection in Spring 
+## DI - Dependency injection in Spring 
 - Constructor injection
 - Setter injection
 - Field injection (Not recommended)
@@ -18,7 +17,7 @@ Dependency injection in Spring
 Coupling: How much work is involved in changing something?
 - Tightly coupled: Engine to a car, Computer to your house (harder to move)
 - Loosely coupled: Tire to a car, laptop to your house (can take anywhere)
-* In software, loosely coupled is often better as code is always changing and iterating to better versions
+In software, loosely coupled is often better as code is always changing and iterating to better versions
 
 Tightly coupled code:
 SuperMario mario = new SuperMario();
@@ -70,7 +69,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
 #### XML configuration (using Component)
     ex.
     App.java
-    public class App {
+    ```public class App {
         public static void main(String[] args) {
             ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
 
@@ -83,7 +82,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
 
     <beans [xml custom tag definition here, can find on spring website]>
         <bean id="vehicle" class="com.navin.Telusko.Car"></bean>
-    </beans>
+    </beans>```
 
 #### Annotation based configuration * (Components, Autowired)
     ex.

From 609c80b4b159bc0f646614007ef11ff7fba6f14a Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Thu, 22 Aug 2024 00:25:42 -0400
Subject: [PATCH 07/11] Update README.md

---
 backend/spring/README.md | 143 +++++++++++++++++++--------------------
 1 file changed, 70 insertions(+), 73 deletions(-)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index 1c5b9a8..ad80f22 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -67,9 +67,9 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
 
 ### Achieving dependency injections through configuration
 #### XML configuration (using Component)
-    ex.
-    App.java
-    ```public class App {
+ex.
+App.java
+    public class App {
         public static void main(String[] args) {
             ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
 
@@ -77,7 +77,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
             obj.drive();
         }
     }
-    spring.xml (in src)
+spring.xml (in src)
     <?xml version="1.0" encoding="UTF-8"?>
 
     <beans [xml custom tag definition here, can find on spring website]>
@@ -85,8 +85,8 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
     </beans>```
 
 #### Annotation based configuration * (Components, Autowired)
-    ex.
-    App.java
+ex.
+App.java
     public class App {
         public static void main(String[] args) {
             ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
@@ -95,14 +95,14 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
             obj.drive();
         }
     }
-    spring.xml (in src)
+spring.xml (in src)
     <?xml version="1.0" encoding="UTF-8"?>
 
     <beans [xml custom tag definition here, can find on spring website]>
        <context:component-scan base-package='com.navin.Telusko'></context:component-scan> 
     </beans>
 
-    Car.java
+Car.java
     package com.navin.Telusko;
     @Component // <- important
     public class Car implements Vehicle {
@@ -112,8 +112,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
     }
 
 #### Combo Annotation & Xml w/ Bean property tags
-    ex.
-    App.java
+App.java
     public class App {
         public static void main(String[] args) {
             ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
@@ -122,7 +121,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
             System.out.println(t);
         }
     }
-    spring.xml (in src)
+spring.xml (in src)
     <?xml version="1.0" encoding="UTF-8"?>
 
     <beans [xml custom tag definition here, can find on spring website]>
@@ -133,7 +132,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
        </bean>
     </beans>
 
-    Car.java
+Car.java
     package com.navin.Telusko;
 
     @Component // <- important
@@ -143,7 +142,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
         }
     }
 
-    Tire.java
+Tire.java
     package com.navin.Telusko;
 
     public class Tire {
@@ -164,8 +163,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
     }
 
 #### Constructor Injection (Still mixed Annotation and Xml Config) & Autowired
-    ex.
-    App.java
+App.java
     public class App {
         public static void main(String[] args) {
             ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
@@ -174,7 +172,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
             obj.drive();
         }
     }
-    spring.xml (in src)
+spring.xml (in src)
     <?xml version="1.0" encoding="UTF-8"?>
 
     <beans [xml custom tag definition here, can find on spring website]>
@@ -185,7 +183,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
        </bean>
     </beans>
 
-    Car.java
+Car.java
     package com.navin.Telusko;
 
     @Component // <- important
@@ -207,7 +205,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
         }
     }
 
-    Tire.java
+Tire.java
     package com.navin.Telusko;
 
     @Component
@@ -234,10 +232,10 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
     }
 
 #### Annotation Confirguation using Maven (New Example)
-    1. Create Maven project (Quick start maven archetype)
-    2. Add dependencies to pom.xml from Maven Repository
-        - Spring context copy and paste
-    Samsung.java
+1. Create Maven project (Quick start maven archetype)
+2. Add dependencies to pom.xml from Maven Repository
+    - Spring context copy and paste
+Samsung.java
     package com.telusko.SpringAnno;
 
 
@@ -260,7 +258,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
         }
     }
 
-    App.java
+App.java
     package com.telusko.SpringAnno;
 
     public class App {
@@ -272,7 +270,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
         }
     }
 
-    AppConfig.java
+AppConfig.java
     package com.telusko.SpringAnno;
 
     // import statements auto inserted here
@@ -291,14 +289,14 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
 
     }
 
-    MobileProcessor.java
+MobileProcessor.java
     package com.telusko.SpringAnno;
 
     public interface MobileProcessor {
         void process();
     }
 
-    Snapdragon.java
+Snapdragon.java
     package com.telusko.SpringAnno;
 
     public class Snapdragon implements MobileProcessor {
@@ -307,12 +305,11 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
         }
     }
 #### Annotation Component (AutoWird Primary Qualifier)
-    1. Add Component tags to Samsung and Snapdragon
-    2. Add ComponentScan to AppConfig to find components (it looks by type)
-        - defaults to class name decapitalized (Samsung->samsung)
-        - With multiple components, you can define a primary (@Primary) or a qualifier (@Qualifier("id"))
-        - 
-    Samsung.java
+1. Add Component tags to Samsung and Snapdragon
+2. Add ComponentScan to AppConfig to find components (it looks by type)
+    - defaults to class name decapitalized (Samsung->samsung)
+    - With multiple components, you can define a primary (@Primary) or a qualifier (@Qualifier("id"))
+Samsung.java
     package com.telusko.SpringAnno;
 
     @Component
@@ -336,7 +333,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
         }
     }
 
-    App.java
+App.java
     package com.telusko.SpringAnno;
 
     // Spring Core Annotations
@@ -349,7 +346,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
         }
     }
 
-    AppConfig.java
+AppConfig.java
     package com.telusko.SpringAnno;
 
     // import statements auto inserted here
@@ -360,14 +357,14 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
 
     }
 
-    MobileProcessor.java
+MobileProcessor.java
     package com.telusko.SpringAnno;
 
     public interface MobileProcessor {
         void process();
     }
 
-    Snapdragon.java
+Snapdragon.java
     package com.telusko.SpringAnno;
 
     // importing Component
@@ -380,7 +377,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
         }
     }
 
-    MediaTek.java
+MediaTek.java
     package com.telusko.SpringAnno;
 
     // importing Component
@@ -395,54 +392,54 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
 ### Another Example of implementing Spring -> Hello World Application
 
 App.java
-package ...
-
-imports
+    package ...
 
-public class App {
-    public static void main(String[] args) {
-        // 1: Launch a Spring Context
-        try(var context = new AnnotationConfigApplicationContext(AppConfig.class)) {
-            // 2: Configure the things we want Spring to manage - @Configuration
-            context.getBean(GamingConsole.class).up();
+    imports
 
-            context.getBean(GameRunner.class).run();
+    public class App {
+        public static void main(String[] args) {
+            // 1: Launch a Spring Context
+            try(var context = new AnnotationConfigApplicationContext(AppConfig.class)) {
+                // 2: Configure the things we want Spring to manage - @Configuration
+                context.getBean(GamingConsole.class).up();
+
+                context.getBean(GameRunner.class).run();
+            }
+            
+
+            
+            System.out.println(context.getBean("name")); // Returns "Jenn"
+            System.out.println(context.getBean("address")) // Returns error, we renamed address -> address2
+
+            System.out.println(context.getBean(Address.class)) // Can use type of Bean
+            
+            
         }
-        
-
-        
-        System.out.println(context.getBean("name")); // Returns "Jenn"
-        System.out.println(context.getBean("address")) // Returns error, we renamed address -> address2
-
-        System.out.println(context.getBean(Address.class)) // Can use type of Bean
-        
-        
     }
-}
 
 AppConfig.java
-package ...
+    package ...
+
+    imports
 
-imports
+    record Person (String name, int age) {};
+    record Address (String firstLine, String city) {};
 
-record Person (String name, int age) {};
-record Address (String firstLine, String city) {};
+    public class AppConfig {
 
-public class AppConfig {
+        @Bean
+        public GamingConsole game() {
+            var game = new PacmanGame();
+            return game;
+        }
 
-    @Bean
-    public GamingConsole game() {
-        var game = new PacmanGame();
-        return game;
+        @Bean
+        public GameRunner gameRunner(GamingConsole game) {
+            var gameRunner = new GameRunner(game);
+            return game;
+        } // Can also change new GameRunner(game) -> new GameRunner(game()) with no parameters
     }
 
-    @Bean
-    public GameRunner gameRunner(GamingConsole game) {
-        var gameRunner = new GameRunner(game);
-        return game;
-    } // Can also change new GameRunner(game) -> new GameRunner(game()) with no parameters
-}
-
 ## Tips
 
 #### List all Spring Beans

From 8c7c28779113c744c51fe9bcef066f1d5a41051d Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Thu, 22 Aug 2024 00:27:24 -0400
Subject: [PATCH 08/11] Update README.md

---
 backend/spring/README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index ad80f22..f73316f 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -8,6 +8,7 @@ This overview was created from notes following 2 youtube tutorials (links provid
 Inversion of control (IoC) is a **principle** where the control of creating objects (in this case) is given to something (Ex. Spring Framework) other than the developer. In Spring this is done through a **design pattern** called dependency injection
 
 ## DI - Dependency injection in Spring 
+Instead of typically using ```obj = **new** Obj();``` We leave the object creation and insertion to Spring
 - Constructor injection
 - Setter injection
 - Field injection (Not recommended)

From 1eb45bc25f9859b8421854d2d11bccebeda1d113 Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Thu, 22 Aug 2024 00:31:49 -0400
Subject: [PATCH 09/11] Update README.md

---
 backend/spring/README.md | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index f73316f..c9bec2d 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -3,12 +3,13 @@ This overview was created from notes following 2 youtube tutorials (links provid
 
 ## Prerequisites
 - Must have a solid understanding of Java and OOP (particularly interfaces)
+- Must have familiarity with Maven/Gradle (2nd YouTube tutorial can provide that)
 
 ## IoC
 Inversion of control (IoC) is a **principle** where the control of creating objects (in this case) is given to something (Ex. Spring Framework) other than the developer. In Spring this is done through a **design pattern** called dependency injection
 
 ## DI - Dependency injection in Spring 
-Instead of typically using ```obj = **new** Obj();``` We leave the object creation and insertion to Spring
+Instead of typically using ```Thing object = new Thing();``` We leave the object creation and insertion to Spring
 - Constructor injection
 - Setter injection
 - Field injection (Not recommended)
@@ -34,7 +35,7 @@ GameRunner runner = new GameRunner(game2);
 // Because all games must implement the GameingConsole interface, GameRunner can accept any GameingConsole object in the constructor
 
 ## Spring Container/Context (IoC Container)
-(is within JVM [Java Virutal Machine])
+(Spring Containers operate within the JVM [Java Virutal Machine])
 - Manages Spring beans & their lifecycle
 - Bean Factory: Basic Spring Container (Not really used)
 - **Application Context**: Advanced Spring Container w/ enterprise-specific features
@@ -54,9 +55,8 @@ Tutorial References (Highly recommend watching!)
 - https://www.youtube.com/watch?v=If1Lw4pLLEo (Fast, comprehensive, good examples) [Also has a more recentt playlist making an example project with Spring and Springboot]
 I watched the 2nd one first, and put the 1st on 1.5x to review.
 
-# Gen Topics
+# General Spring Topics
 - IoC containers (Inversion of Control)
-- Data access framework
 - Dependency injections
     - Injecting object dependencies
 
@@ -70,6 +70,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
 #### XML configuration (using Component)
 ex.
 App.java
+```
     public class App {
         public static void main(String[] args) {
             ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
@@ -78,16 +79,18 @@ App.java
             obj.drive();
         }
     }
+```
 spring.xml (in src)
     <?xml version="1.0" encoding="UTF-8"?>
 
     <beans [xml custom tag definition here, can find on spring website]>
         <bean id="vehicle" class="com.navin.Telusko.Car"></bean>
-    </beans>```
+    </beans>
 
 #### Annotation based configuration * (Components, Autowired)
 ex.
 App.java
+```
     public class App {
         public static void main(String[] args) {
             ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
@@ -96,6 +99,7 @@ App.java
             obj.drive();
         }
     }
+```
 spring.xml (in src)
     <?xml version="1.0" encoding="UTF-8"?>
 

From 3121990e6107eeb9faae0a57d5087306d0b5fff2 Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Thu, 22 Aug 2024 00:36:34 -0400
Subject: [PATCH 10/11] Update README.md

---
 backend/spring/README.md | 55 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 48 insertions(+), 7 deletions(-)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index c9bec2d..47cad54 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -68,7 +68,7 @@ I watched the 2nd one first, and put the 1st on 1.5x to review.
 
 ### Achieving dependency injections through configuration
 #### XML configuration (using Component)
-ex.
+
 App.java
 ```
     public class App {
@@ -88,7 +88,7 @@ spring.xml (in src)
     </beans>
 
 #### Annotation based configuration * (Components, Autowired)
-ex.
+
 App.java
 ```
     public class App {
@@ -108,6 +108,7 @@ spring.xml (in src)
     </beans>
 
 Car.java
+```
     package com.navin.Telusko;
     @Component // <- important
     public class Car implements Vehicle {
@@ -115,9 +116,11 @@ Car.java
             System.out.println("driving");
         }
     }
+```
 
 #### Combo Annotation & Xml w/ Bean property tags
 App.java
+```
     public class App {
         public static void main(String[] args) {
             ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
@@ -126,6 +129,7 @@ App.java
             System.out.println(t);
         }
     }
+```
 spring.xml (in src)
     <?xml version="1.0" encoding="UTF-8"?>
 
@@ -138,6 +142,7 @@ spring.xml (in src)
     </beans>
 
 Car.java
+```
     package com.navin.Telusko;
 
     @Component // <- important
@@ -146,8 +151,10 @@ Car.java
             System.out.println("driving");
         }
     }
+```
 
 Tire.java
+```
     package com.navin.Telusko;
 
     public class Tire {
@@ -166,9 +173,11 @@ Tire.java
             return "Tire [brand=" + brand + "]";
         }
     }
+```
 
 #### Constructor Injection (Still mixed Annotation and Xml Config) & Autowired
 App.java
+```
     public class App {
         public static void main(String[] args) {
             ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml") // Your own xml file and file name
@@ -177,6 +186,7 @@ App.java
             obj.drive();
         }
     }
+```
 spring.xml (in src)
     <?xml version="1.0" encoding="UTF-8"?>
 
@@ -189,6 +199,7 @@ spring.xml (in src)
     </beans>
 
 Car.java
+```
     package com.navin.Telusko;
 
     @Component // <- important
@@ -209,8 +220,10 @@ Car.java
             System.out.println("car" + tire);
         }
     }
+```
 
 Tire.java
+```
     package com.navin.Telusko;
 
     @Component
@@ -235,6 +248,7 @@ Tire.java
             return "Tire [brand=" + brand + "]";
         }
     }
+```
 
 #### Annotation Confirguation using Maven (New Example)
 1. Create Maven project (Quick start maven archetype)
@@ -243,7 +257,7 @@ Tire.java
 Samsung.java
     package com.telusko.SpringAnno;
 
-
+```
     public class Samsung {
 
         @Autowired // checks by type
@@ -262,8 +276,10 @@ Samsung.java
             cpu.process();
         }
     }
+```
 
 App.java
+```
     package com.telusko.SpringAnno;
 
     public class App {
@@ -274,8 +290,10 @@ App.java
             s7.config();
         }
     }
+```
 
 AppConfig.java
+```
     package com.telusko.SpringAnno;
 
     // import statements auto inserted here
@@ -293,15 +311,19 @@ AppConfig.java
         }
 
     }
+```
 
 MobileProcessor.java
+```
     package com.telusko.SpringAnno;
 
     public interface MobileProcessor {
         void process();
     }
+```
 
 Snapdragon.java
+```
     package com.telusko.SpringAnno;
 
     public class Snapdragon implements MobileProcessor {
@@ -309,12 +331,16 @@ Snapdragon.java
             System.out.println("Word's best CPU");
         }
     }
+```
+
 #### Annotation Component (AutoWird Primary Qualifier)
 1. Add Component tags to Samsung and Snapdragon
 2. Add ComponentScan to AppConfig to find components (it looks by type)
     - defaults to class name decapitalized (Samsung->samsung)
     - With multiple components, you can define a primary (@Primary) or a qualifier (@Qualifier("id"))
+
 Samsung.java
+```
     package com.telusko.SpringAnno;
 
     @Component
@@ -337,8 +363,10 @@ Samsung.java
             cpu.process();
         }
     }
+```
 
 App.java
+```
     package com.telusko.SpringAnno;
 
     // Spring Core Annotations
@@ -350,8 +378,10 @@ App.java
             s7.config();
         }
     }
+```
 
 AppConfig.java
+```
     package com.telusko.SpringAnno;
 
     // import statements auto inserted here
@@ -361,15 +391,19 @@ AppConfig.java
     public class AppConfig {
 
     }
+```
 
 MobileProcessor.java
+```
     package com.telusko.SpringAnno;
 
     public interface MobileProcessor {
         void process();
     }
+```
 
 Snapdragon.java
+```
     package com.telusko.SpringAnno;
 
     // importing Component
@@ -381,8 +415,10 @@ Snapdragon.java
             System.out.println("Word's best CPU");
         }
     }
+```
 
 MediaTek.java
+```
     package com.telusko.SpringAnno;
 
     // importing Component
@@ -393,13 +429,15 @@ MediaTek.java
             System.out.println("2nd best CPU");
         }
     }
+```
 
 ### Another Example of implementing Spring -> Hello World Application
 
 App.java
-    package ...
+```
+    // package ...
 
-    imports
+    // imports (from Spring usually)
 
     public class App {
         public static void main(String[] args) {
@@ -421,11 +459,13 @@ App.java
             
         }
     }
+```
 
 AppConfig.java
-    package ...
+```
+    // package ...
 
-    imports
+    // imports (from Spring ususally)
 
     record Person (String name, int age) {};
     record Address (String firstLine, String city) {};
@@ -444,6 +484,7 @@ AppConfig.java
             return game;
         } // Can also change new GameRunner(game) -> new GameRunner(game()) with no parameters
     }
+```
 
 ## Tips
 

From 738f3ac339ddabf17e317a4ebf12cd7284a4dbfa Mon Sep 17 00:00:00 2001
From: Kelsey Sterner <titannandromeda@gmail.com>
Date: Thu, 22 Aug 2024 00:37:57 -0400
Subject: [PATCH 11/11] Update README.md

---
 backend/spring/README.md | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/backend/spring/README.md b/backend/spring/README.md
index 47cad54..750127e 100644
--- a/backend/spring/README.md
+++ b/backend/spring/README.md
@@ -448,15 +448,6 @@ App.java
 
                 context.getBean(GameRunner.class).run();
             }
-            
-
-            
-            System.out.println(context.getBean("name")); // Returns "Jenn"
-            System.out.println(context.getBean("address")) // Returns error, we renamed address -> address2
-
-            System.out.println(context.getBean(Address.class)) // Can use type of Bean
-            
-            
         }
     }
 ```
@@ -467,9 +458,6 @@ AppConfig.java
 
     // imports (from Spring ususally)
 
-    record Person (String name, int age) {};
-    record Address (String firstLine, String city) {};
-
     public class AppConfig {
 
         @Bean