Kurs om
Spring Framework och Spring Boot

Background & History

• Rod Johnson
• The fallacy of EJB
• Why Spring was created
• Properties of Spring
• Spring configuration forms
• The evolution and success of Spring
• When Spring started to crumble on its own weight
• The inception of Spring Boot
• Properties of Spring Boot
• Overview of Spring projects

The Robostore App

• Purpose
• H2 database
• H2 console
• Source code
• Tweaks

Fundamentals

Class Loading

• Class path
• How the JVM loads a class
• JAR files
• Executable JAR file
• Application JAR file
• WAR file
• Static variables
• Thread local variables

Dependency Injection

• Sample payment service
• Usage
• Instantiation
• Obvious problems
• Externalization
• Configuration
• Dependency injection, instead
• Inversion of Control, explained
• Call-backs
• Bean factory
• Scopes
• Life-cycle methods
• Sample Spring app

Application Context

• Spring Bean Factory
• Spring Application Context
• Types of app contexts
• Configuration samples
• Using XML
• Using Groovy
• Using Java
• Customizations
• Simple bean tracer
• Using PropertySourcesPlaceholderConfigurer

Resources

• What is a Spring resource
• Resource types
• Writeable resources
• Resource loader
• Resource dependency

SpEL - Spring Expression Language

• What is SPEL?
• Syntax
• Two syntax forms to keep apart

Configuration

XML Configuration

The classic way of wire an application together.

• Why learn XML configuration
• Basic XML bean syntax
• Setter injection
• Constructor injection
• Bean references
• How to load XML bean files
• Bean scopes in XML
• Configuring factory methods
• Life-cycle call-backs in XML
• Using auto-wiring in XML
• Collection property types

Beans from a file (under the hood)

• Sample domain classes
• BeanRepository
• PropertiesLoader
• BeanRepositoryImpl
• register
• getBean
• instantiate

Java Configuration

The better way of wire an application together.

• What is Java configuration of a Spring app
• Writing a @Configuration class with @Bean methods
• Application context
• Context registration
• Injecting bean dependencies
• Scopes
• Initialization method
• Destruction method
• Life-cycle call-backs

@nnotation Configuration

The modern way of wire an application together.

• Writing a @Component class and how it relates to @Configuration and @Bean
• Class-path scanning
• Using the scan() method
• Using @ComponentScan
• Using @Autowired
• Constructor injection
• Using a @Qualifier to select a bean by name
• Spring stereotypes

Beans from annotations (under the hood)

• Sample domain classes
• Annotations
• BeanRepository
• ClasspathLoader
• loadClassNames
• getBeanClassNames

Database Access

Brief about JDBC

• History
• Drivers
• JDBC URL
• Connection
• Statements
• Prepared statements
• Queries
• Iterating over a result-set

Database Access via Spring JDBC

Using JDBC in Spring with JdbcTemplate and friends.

• Spring JDBC module
• Class JdbcTemplate
• Configuring a DataSource
• DriverManagerDataSource
• Embedded database
• H2 memory db
• H2 file db
• H2 server db
• MySQL / PostgreSQL data sources
• Query for a single value
• Query for a multiple values
• Query for a domain object
• Handle not-found
• Query for a Stream
• Named query parameters
• Usage of NamedParameterJdbcTemplate
• Retrieve an auto-generated primary-key

Spring Boot

Presentation of Spring Boot and its relation to Spring Framework. Discussions of concepts such as starter dependencies and autoconfiguration.

Spring Boot Overview

• Why Spring Boot was created
• What is Spring Boot more precisely
• Version history
• Spring Framework vs. Spring Boot
• Spring Initializer
• Spring Boot CLI
• Started dependencies
• Auto-configuration

Spring Native

• What do we mean with native?
• Graal VM
• What is required to build a native image?
• No dynamic class loading and how to deal with it
• Spring Boot build plugin
• How to build Spring app as a native image (a.k.a. executable)
• Example

Configuration Properties

Different ways to provide configuration properties.

• What is a configuration property
• Application *.properties file
• Standard Spring properties
• Inject property to field
• Inject group of properties to a bean
• Inject all app properties
• Standard type conversions
• Using YaML (*.yml)
• Override on the command-line
• Override by an environment variable
• Using application profiles
• Profile-dependent property files
• Generate build meta-data
• Generate GIT meta-data

Using Lombok

• What is Lombok
• Generate getters & setters
• Generate constructors
• Builders
• Generate toString() method
• Generate equals() & hashCode() methods
• Using @Data to bundle them all
• Using @Value to create an immutable data-class

Spring Shell

• What is Spring Shell?
• Getting started
• Simple usage
• @ShellComponent
• @ShellMethod
• @ShellOption
• Printing output using the Terminal bean
• Using the shell builder
• Built-in commands

Database access via JPA

How to use Spring JPA and autoconfiguration.

• What is JPA
• What is ORM
• What is JDO
• Spring Data project
• Spring Data JPA
• Starter dependencies
• Configure a data-source
• JNDI data-source
• Connection pool
• Hikari CP
• Entity class
• JPA annotations
• JPA repository interface
• Auto-generated CRUD methods
• Database initialization
• Writing query auto-methods
• Using the @Query annotation
• Repository types
• Pagination
• Populating a database

SQL & DB access from annotations (under the hood)

• Sample domain classes
• Annotations
• DAO factory
• The magic behind this
• SQL generators
• Column descriptors
• Helper methods
• Handler implementations
• Row mapper

Spring Web

HTTP Concepts

Brief about HTTP and web concepts in order to relate and put into context of the Spring Web Apps chapters of this course.

• HTTP Request / response
• HTTP operations (methods)
• URI / path
• MIME types
• Response status codes
• Cookies
• Java servlet
• HTTP session
• JSP
• Model-View-Controller (MVC)
• AJAX
• The new fetch API
• REST web services
• REST operations
• Web app architectures
• The classic multi-page app (MPA)
• The hybrid multi-page app (Hybrid)
• The modern single-page app (SPA)

Building a classic multi-page web app

Using Spring MVC with HTML views.

• Creating a Spring Boot project
• The Spring Web MVC architecture
• Starter package
• Understanding controllers and views
• URI path composition
• GET actions
• View resolution and mapping
• Path variables
• Query parameters
• Redirection
• Assets files
• Template engines
• Brief about Thymeleaf
• Using Mustache
• Rendering a single object in Mustache
• Rendering a list of objects in Mustache

Sending Data

• Form data
• POST actions
• @RequestParam
• Form data bean

Building an AJAX hybrid web app

Using Spring MVC with AJAX powered HTML views.

• Creating a Spring Boot project
• Changes of controllers
• Changes of view pages
• Controller-less views
• Sample REST CRUD controller
• JavaScript DAO service

Building a single-page web app

Using Spring REST as a microservice.

• Creating a Spring Boot project
• Changes of controllers and views
• Run-time deployment of an SPA client
• External SPA client
• Configuring CORS
• Internal SPA client
• Spring configuration for an internal SPA client
• SPA controller

Deployment

Best practices for deploying Spring apps.

• Deployment options
• Generating an executable JAR as a microservice
• Generating a WAR for deployment to a servlet container
• Working with configuration profiles
• Brief about database schema migration tools

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