Roadmap to becoming a Java developer in 2025:

Below you can find a chart demonstrating the paths that you can take and the libraries that you would want to learn to become a Java developer. I made this chart as a tip for everyone who asks me, "What should I learn next as a Java developer?"

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The purpose of this roadmap is to give you an idea about the landscape. The road map will guide you if you are confused about what to learn next, rather than encouraging you to pick what is hip and trendy. You should grow some understanding of why one tool would be better suited for some cases than the other and remember hip and trendy does not always mean best suited for the job

If you like or are using this project to learn or start your solution, please give it a star. Thanks!

1. Prerequisites

   • Java
   • Gradle or Maven
   • SQL

2. General Development Skills

   • Learn GIT, create a few repositories on GitHub, share your code with other people
   • Know HTTP(S) protocol, request methods (GET, POST, PUT, PATCH, DELETE, OPTIONS)
   • Don't be afraid of using Google, Power Searching with Google
   • Read a few books about algorithms and data structures
   • Learn about implementation of a basic Authentication
   • Solid principles, etc

3. CLI Tools

   1. args4j
   2. JCommander
   3. airline

4. Web Frameworks + Routers

   1. Spring
   2. Play Framework
   3. Spark
   4. dropwizard
   5. nanohttpd
   6. Vertx

5. Databases

   1. Relational
      1. SQL Server
      2. PostgreSQL
      3. MariaDB
      4. MySQL
      5. Oracle
   2. Cloud Databases
      • CosmosDB
      • DynamoDB
   3. Search Engines
      • ElasticSearch
      • Opensearch
      • Algolia
   4. NoSQL
      • MongoDB
      • Redis
      • Apache Cassandra
      • Clickhouse
      • InfluxDB
      • CouchDB

6. ORMs

   1. Hibernate
   2. Ebean

7. Caching

   1. Caffeine
   2. EHCache
   3. Cache2k
   4. Distributed Cache
      1. Java-Redis
      2. Java-Memcached
      3. Infinispan

8. Logging

   1. Log Frameworks
      • Zap
      • TinyLog
      • log4j
   2. Log Management System
      • ELK Stack
      • Sentry.io
      • Loggly.com
      • Tracer

9. Real-Time Communication

   1. Socket.IO
   2. atmosphere
   3. webbit

10. API Clients

    1. REST
       • okhttp
       • retrofit
    2. GraphQL

11. Good to Know

    • Beanvalidation
    • bouncycastle
    • gson
    • Apache Shiro
    • JJWT
    • RxJava
    • Quarkus

12. Testing

    1. Unit, Behavior, Integration, Load Testing

       • JUnit
       • JMeter
       • CitrusFramework
       • Gatling
       • Tsung
       • Mockito
       • Assertj

    2. E2E Testing

       • Selenium
       • Wiremock
       • Testcontainers

13. Task Scheduling

    • Aurora
    • elasticjob
    • Sundial
    • cron-utils

14. MicroServices

    1. Message-Broker
       • RabbitMQ
       • Apache Kafka
       • ActiveMQ
       • Apache Pulsar
    2. Message-Bus
       • mbassador
       • rmq
    3. Frameworks
       • Apollo
       • lagom-framework
       • micronaut
       • eureka
       • helidon
       • armeria
    4. RPC
       • Protocol Buffers
       • gRPC-Java
       • thrift

15. Java-Patterns

If you think the roadmap can be improved, please do open a PR with any updates and submit any issues. Also, I will continue to improve this, so you might want to star this repository to revisit.

Idea from : Golang Developer Roadmap

The roadmap is built using Draw.io. Project file can be found at java-developer-roadmap.xml file. To modify it, open draw.io, click Open Existing Diagram and choose xml file with project. It will open the roadmap for you. Update it, upload and update the images in readme and create a PR (export as png with 400% zoom and minify that with Compressor.io).

• Open a pull request with improvements
• Discuss ideas in issues
• Spread the word