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dropnz / java-application-building

1. Java Application as a Black Box: codebase management, building, troubleshooting and running. 30hrs.

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Java Application Building

1. Java Application as a Black Box: codebase management, building, troubleshooting and running. 30hrs.

Training Objectives

  • Understanding Java platform architecture and its typical defects
  • Hands-on skill of managing Java codebase with version control tool
  • Understanding core Java application structure for fast localization focus
  • Hands-on skill of building and autotesting complex Java Application
  • Understanding core Java syntax to localize and report compile-time errors
  • Hands-on skill of running and debugging complex Java Application
  • Understanding core Application architecture for fast localization focus

Prerequisites

Hardware

  • RAM ≥ 8Гб
  • Wi-Fi with Internet access

Software

Network Access

  • github.org :443 :80
  • repo1.maven.org :443 :80
  • jcenter.bintray.com :443 :80
  • hub.docker.com :443 :80

Agenda

Training introducing and focusing (1 hrs)

  • Schedule
  • Trainer
  • Training overview
  • Rules

Hands-on: teams and their demand

  • Pairs forming and introduction
  • Topics focus demand from attendees
  • Additional topics demand form attendees

Intro to Java Platform (2)

Java platform

  • Java Platform definition
  • Java Platform goals and constrains
  • Brief history and versioning
  • Basic terms: JVM, JRE, JDK
  • Sourcepath and Classpath

Demo

  • Two-classes Java application manual build and run cycle
  • Run-time parametrization: JVM parameters, application properties, program arguments

Hands-on

  • Two-classes Java application manual build and run cycle with run-time parametrization
javac
java
javadoc

Java Application structure (2)

Application structure

  • Class and its responsibility
  • Method and its intention
  • Package and its cohesion
  • JAR and executable JARs

Typical development errors

  • Compiler warnings
  • Compiler errors (CNFE, typing)
  • Run-time errors (CNDFE, Exceptions and Errors)

Demo

  • Compiling milti-class packaged application from sources
  • Compiling milti-class packaged application from sources and raw comiled classes
  • Compiling milti-class packaged application from sources and JARed comiled classes
  • Making and running executable JAR

Hands-on

  • Making and running executable JAR from packaged sources and JARed comiled classes

Git DVCS overview (1)

Local versioning workflow

  • Local repo
  • Commit
  • Log
  • Tag
  • Branch

Remote versioing workflow

  • Remote repo
  • Clone
  • Push
  • Pull

Demo

  • Make group custom branch
  • Local and remote workflow with IDE tool

Hands-on

  • Fork this repo with your account
  • Add pair as collborator
  • Clone fork locally
git clone --branch master --depth 1 https://github.com/ACCOUNT/java-application-building
  • Open project with IDE
  • Make identyfing change and push

Intro to configuration management patterns (1)

Repo patterns

  • Distributed
  • Centralized

Branching patterns

  • Team branch
  • Relese branch
  • Git Flow: feature branches + dev branch
  • Trunk-based development + Feature toggling

Demo

  • Making pull-request: code review + merge

Hands-on

  • Make change
  • Make pull-request for code review and merge
  • Make reverse pull-request to get trainers changes

Maven Overview (1)

Maven build lifecycle

  • Build lifecycles
  • Lifecycles phases
  • Plugins
  • Managing plugins with pom.xml

Dependency management

  • Dependecy artifacts: JARed classes, sources, javadocs
  • Artifact repositories
  • Artifact identifying
  • Artifact versioning: stable and snapshots
  • Dependency management with pom.xml
  • Typical issues: dependency hell

Demo

  • Unit vs Integration tests pattern
  • Partial application build with IDE
  • Uber-jar pattern
  • Full application build with IDE
  • Build results analysing

Hands-on

  • Full application build with IDE
  • Errors analysing
  • Compile errors fixing
  • Build without tests ran

IDE tooling overview (1)

Demo

  • Project settings and structure: modules, sourcepath + classpath
  • Main and Test sources
  • Workspace
  • Views and hotkey switching
  • Editing sources and foreground compilation
  • Debugging methods
  • Running tests from IDE
  • Running application with run configuration and hotkey shortcut
  • Full application building from Maven view
  • Hotkey shortcuts for git workflow operations
  • Main hotkey

Hands-on

  • Edit: fix test defects localized
  • Debug
  • Run tests
  • Full Maven build
  • Build results analysing
  • Commit and push

Memory structure and errors (2)

Memory structure

  • Methods and Call Stack
  • Objects and Heap Object Space
  • Classes and Perm/Meta Space
  • References in all scopes and GC

Errors

  • Class locading errors: compilation and run-time
  • Static context access
  • NPE
  • OOME: object heap space leak
  • OOME: perm/meta space leak
  • GC overhelming and stop-the-world

Demo

  • Application profiling with VisualGC plugin and Heap profiling
  • Heap dump

Hand-on

  • Application profiling with VisualGC plugin and Heap profiling

Error handling architecture (2)

Exception definition

  • Type
  • Object
  • Handling
  • Stack trace

Exception types

  • Built-in
  • Errors vs Exceptions
  • Checked vs Unchecked

Handling architecture

  • Where to handle: system architecture layering aspect
  • How to handle: patterns

Try-with-resources

  • TRW
  • Stateful vs Stateless components

Demo

  • Business exception design and handling
  • Exception suppression demo

Hands-on

  • Business exception design and handling

Multithreading architecture (2)

Threads overview

  • Thread concept
  • Scheduler
  • Scheduler overhead issue
  • Data race issue
  • Thread-safety design and documetation
  • Threads syncronization: why
  • Deadlock issue

Demo

  • Data race issue demo
  • Application profiling with threads states and stack dump

Hands-on

  • Application profiling with threads states and stack dump

Web application architecture (2)

HTTP protocol

  • HTTP as a transport layer
  • Methods
  • Payload
  • Errors

Web container

  • JavaEE/JakartaEE standart
  • Tomcat overview
  • Web application layout
  • Webapp building
  • Webapp deploying
  • Webapp running
  • Webapp undeploying

Web application architectures

  • Components: servlets, jsp, filters, listeners
  • UI webapp architecture
  • REST- and Web-services architecture

Demo

  • Simple UI webapp building and deploying to Tomcat
  • HTTP layer sniffing with Chrome

Hands-on

  • Simple UI webapp building and deploying to Tomcat
  • HTTP layer sniffing with Chrome

Frameworked Webapp architecture (2)

Framework concept

  • Framework definintion
  • Typical application architecture: layers
  • Typical responsibilities
  • Application configuration: why and what
  • Why not JavaEE

Spring

  • Responsibilities
  • Application configuration ways
  • Context definition
  • Profiles definition
  • Typical issues with context components

Spring MVC

  • Responsibilities for REST and SOAP API
  • Typical issues with Controllers

Spring Boot

  • Responsibilities
  • Typical issues with Boot modules

Demo

  • REST API overview
  • Structure of Boot application for API
  • Building and running

Hands-on

  • Building and running Boot REST API application
  • Manual tesing

Data storage architecture (2)

Data storage types

  • Plain files
  • RDBMS
  • NoSQL/NewSQL
  • Pros and Cons

RDBMS access types

  • JDBC API: db schema constrains, type mapping, transactions
  • JPA API: entities and constrains, caching, transactions
  • Spring Boot Data generated repositores

Data Validation API

  • Configuring constraints

Typical issues

  • Db schema constrains
  • Entities constraints
  • Validation API constraints
  • JDBC transactions and isolation, db deadlocks
  • JPA transactions and optimistic exceptions

DB versioning

  • Why

Demo

  • DB versioning with Liquibase and access with Boot Data repositories

Hands-on

  • Add entity field with Validation API constraints
  • Add Liquibase change
  • Build and run application
  • Manual testing

Autotests architecture (2)

Autotests definintion

  • Testing scopes mapped to application architecture
  • Test structure
  • Test doublers
  • Reporting: test run and coverage
  • Test error types

Demo

  • Attendees choose their typical scope for demo
  • Unit test: plain service + manual doubling
  • Unit test: service + spring context doubling
  • Integration test: controller + serivce
  • Integration test: controller + service + repository
  • Integration test: HTTP layer + controller + service + repository
  • Integration test: HTTP layer + controller + service + remote REST service + repository

UI testing

  • HTML overview
  • Selenium API overview
  • Selenide library
  • Driver manager library

Demo

  • UI Selenide test with Chrome headless mode off

Hands-on

  • Choose testing scope
  • Implement autotest
  • Run from IDE
  • Run full Maven build
  • Analyse reports

Logging and Monitoring architecture (2)

Local logging

  • Logging libraries hell overview
  • SLF4J API
  • Logback configuration
  • Profiles
  • Production issues

Remote logging

  • Centralized remote logging architecture
  • ELK stack for implementation

Demo

  • Remote ELK overview
  • Application logs to Logstash
  • Log stream with Kibana
  • Log searching and filtering with Kibana
  • Business events filtering
  • Kibana dashboards for business events

Monitoring with ELK

  • What to monitor?
  • Gathering system metrics with Beats
  • Kibana dashboards

Monitoring with JMX

  • What to monitor?
  • JMX MBeans
  • MBeans implementations: JVM, container, framework, application
  • Remote monitoring with JVisualVM

Hands-on

  • Customize logging level
  • Analyse logs
  • Local monitoring with JVVM

DevOps Pipeline architecture* (2)

DevOps culture

  • Production process overview
  • Bottlenecks
  • Communications as a key
  • DevOps culture

DevOps pipeline tooling

  • Source management
  • Artifact management
  • CI
  • Autotesting
  • Stage provisioing and IaaC concept
  • Stage virtualization and containerization
  • CD
  • DB versioning
  • Feature toggling
  • Deployment patterns
  • Production logging and monitoring

QA value

  • Where is QA adds value?

Demo

  • CD pipeline demo

Hands-on

  • Push feature change full-auto to prod environment

Test containerization architecture* (1)

Containerization concept

  • Containerization goals
  • Containerization vs virtualization
  • QA use-cases and value

Docker implementation overview

  • Docker images
  • Docker container
  • Docker Hub
  • Image provisioning

Demo

  • Application dockeriaztion
  • Container run

Environment management

  • Docker Compose
  • Docker Swarm
  • k8s

Buffer (2)

  • Daily retrospectives

About

1. Java Application as a Black Box: codebase management, building, troubleshooting and running. 30hrs.