4 листопада відбувся вебінар Java Community на тему “Where Is My Development Zone?” від Олександра Навки (Lead Software Engineer, Consultant, GlobalLogic). Підняли питання розвитку розробника, незважаючи ні на позицію, ні на досвід роботи, та говорили про те, як себе челенджити та розвивати. Відео та деталі заходу: https://bit.ly/2ZzKGTm

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Where Is My Development Zone?
Oleksandr Navka
Lead Software Engineer
04/11/2021

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Agenda
1. Do I need to improve my skills?
2. Development roadmap
3. How to improve skills?

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Do I need to improve my skills?

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Preface
In 2021 - 73 interviews
A lot of candidates don’t improve their skills

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Why do I need to improve?
1. To be more valuable on the market
2. To receive more money

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How to measure my current level?
1. Take an interview in any company
2. Ask someone for feedback (https://getmentor.dev/)

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Know your value

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Development roadmap

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Skills
World view
Coding Troubleshoot

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• Software design
• Algorithms
• Databases
• Message brokers
• Multithreading
• Frameworks
• Infrastructure

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System design
• Patterns
• Architecture design

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System design
1. Do I have methods that return null?
2. Do I have interfaces that were implemented by several classes
3. Do I have interfaces with only one implementation?

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System design
API
gateway
Service 1
Service 2
Client
POST

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System design
Client
Payment
service
Booking
Service

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Message brokers
• Kafka, RabbitMQ, ActiveMQ, HiveMQ
• MQTT, AMQP

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Java and JVM
• Why I’ve got out of memory?
• How to measure performance?
• How to make profiling?

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Java and JVM
How to break JVM?
• OutOfMemory
• Stackoverflow
• Number of threads
• Number of opened connections

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IDE
How to debug?
• breakpoint by condition
• change variable
• drop frame
• multithreading debugging

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Multithreading
• volatile and synchronized
• java.util.concurrent
• ExecutorService and ForkJoinPool

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Multithreading
public class MultithreadingTask {
private volatile int counter;
public int getCounter() {
return counter;
}
public synchronized void updateCounter() {
counter++;
}
}

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Databases
• SQL
• Transactions
• Read only transaction
• Transaction isolation
• Locks

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Databases
begin
update table set field = field + 5
commit
begin
update table set field = field +10
commit
25
tx1 tx2

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Java + Databases
JDBC + JPA + Hibernate + Spring data

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Я работаю с базой данных на высоком уровне
абстракции по этому знания Hibernate мне не
нужны
неизвестный автор

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Databases
Batch size
• JDBC
• JPA
• Hibernate
• Spring Data

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Hibernate
OneToOne
OneToMany
...
@Entity @Entity
class1 { class2 {
} }
@Entity
class1 { class2 {
} }

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Hibernate
Session
get, load
save, persist
Dirty check
Dirty check for collections
How to get query generated by Hibernate?

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Spring
Profiles
Spring vs Spring boot
@Autowired
List<SomeClass>
How to integrate JWT with Spring security?

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Docker
Host
Docker
PostgreSQL

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Docker
Host
Docker
PostgreSQL
Application

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Network
HTTP and HTTPS
Quic?

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Development roadmap
https://roadmap.sh/

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How to improve skills?

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How to improve skills?
• Read books
• Educational videos
• Answer on stackoverflow questions
• Resolve Leetcode tasks
• Listen podcasts
• Read social networks of influence people

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Books - System Design
Head First Design Patterns. Building Extensible and Maintainable Object-
Oriented Software 2nd Edition

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Books - System Design
Fundamentals of Software Architecture: A Comprehensive Guide to
Patterns, Characteristics, and Best Practices

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Books - Multithreading
Java Concurrency in Practice 1st Edition - Brian Goetz

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Books - Hibernate
Java Persistence with Hibernate Second Edition - Christian Bauer and
Gavin King

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Books - Spring
Spring in Action, Fifth Edition - Craig Walls

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Podcasts
1. Радио Т
2. Podlodka Podcast
3. Запуск завтра

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Software developers are forever
students

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