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?"

[中文版](./i18n/zh-CN/ReadMe-zh-CN.md)

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


1. Prerequisites

- [Java](https://www.java.com/en/download/)

- [Gradle](https://gradle.org/)

or [Maven](https://maven.apache.org/)

- [SQL](https://www.w3schools.com/sql/default.asp)

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](http://www.powersearchingwithGoogle.com/)

- Read a few books about algorithms and data structures

- Learn about implementation of a basic Authentication

- Solid principles, etc

3. CLI Tools

1. [args4j](http://args4j.kohsuke.org/)

2. [JCommander](http://jcommander.org/)

3. [airline](https://github.com/airlift/airline)

4. Web Frameworks + Routers

1. [Spring](https://spring.io/)

2. [Play Framework](https://www.playframework.com/)

3. [Spark](http://sparkjava.com/)

4. [dropwizard](https://www.dropwizard.io/en/stable/)

5. [nanohttpd](https://github.com/NanoHttpd/nanohttpd)

6. [Vertx](https://vertx.io/)

5. Databases

1. Relational

1. [SQL Server](https://www.microsoft.com/en-us/sql-server/sql-server-2017)

2. [PostgreSQL](https://www.postgresql.org/)

3. [MariaDB](https://mariadb.org/)

4. [MySQL](https://www.mysql.com/)

5. [Oracle](https://www.oracle.com/database/)

2. Cloud Databases

- [CosmosDB](https://docs.microsoft.com/en-us/azure/cosmos-db)

- [DynamoDB](https://aws.amazon.com/dynamodb/)

3. Search Engines

- [ElasticSearch](https://www.elastic.co/)

- [Opensearch](https://opensearch.org/)

- [Algolia](https://www.algolia.com/)

4. NoSQL

- [MongoDB](https://www.monJavadb.com/)

- [Redis](https://redis.io/)

- [Apache Cassandra](http://cassandra.apache.org/)

- [Clickhouse](https://clickhouse.com/)

- [InfluxDB](https://www.influxdata.com/)

- [CouchDB](http://couchdb.apache.org/)

6. ORMs

1. [Hibernate](https://hibernate.org/)

2. [Ebean](https://ebean.io/)

7. Caching

1. [Caffeine](https://github.com/ben-manes/caffeine)

2. [EHCache](http://www.ehcache.org/)

3. [Cache2k](https://cache2k.org/)

4. Distributed Cache

1. [Java-Redis](https://github.com/xetorthio/jedis)

2. [Java-Memcached](https://redislabs.com/lp/memcached-java/)

3. [Infinispan](http://infinispan.org/)

8. Logging

1. Log Frameworks

- [Zap](https://github.com/uber-Java/zap)

- [TinyLog](http://www.tinylog.org/)

- [log4j](https://logging.apache.org/log4j)

2. Log Management System

- [ELK Stack](https://www.elastic.co/what-is/elk-stack)

- [Sentry.io](http://sentry.io)

- [Loggly.com](https://loggly.com)

- [Tracer](https://github.com/zalando/tracer)

9. Real-Time Communication

1. [Socket.IO](https://socket.io/)

2. [atmosphere](https://github.com/Atmosphere/atmosphere)

3. [webbit](https://github.com/webbit/webbit)

10. API Clients

1. REST

- [okhttp](https://square.github.io/okhttp/)

- [retrofit](https://square.github.io/retrofit/)

2. [GraphQL](https://graphql.org/)

11. Good to Know

- [Beanvalidation](https://beanvalidation.org/)

- [bouncycastle](https://www.bouncycastle.org/java.html)

- [gson](https://github.com/google/gson)

- [Apache Shiro](https://shiro.apache.org/)

- [JJWT](https://github.com/jwtk/jjwt)

- [RxJava](https://github.com/ReactiveX/RxJava)

- [Quarkus](https://quarkus.io/)

12. Testing

1. Unit, Behavior, Integration, Load Testing

- [JUnit](http://junit.org/)

- [JMeter](https://jmeter.apache.org/)

- [CitrusFramework](https://citrusframework.org/)

- [Gatling](https://gatling.io/)

- [Tsung](http://tsung.erlang-projects.org/)

- [Mockito](https://site.mockito.org/)

- [Assertj](https://joel-costigliola.github.io/assertj)

2. E2E Testing

- [Selenium](https://github.com/tebeka/selenium)

- [Wiremock](https://wiremock.org/)

- [Testcontainers](https://testcontainers.com/)

13. Task Scheduling

- [Aurora](https://aurora.apache.org/)

- [elasticjob](https://github.com/elasticjob/elastic-job-lite)

- [Sundial](https://github.com/knowm/Sundial)

- [cron-utils](https://github.com/jmrozanec/cron-utils)

14. MicroServices

1. Message-Broker

- [RabbitMQ](https://www.rabbitmq.com/tutorials/tutorial-one-javascript.html)

- [Apache Kafka](https://www.npmjs.com/package/kafka-node)

- [ActiveMQ](https://github.com/apache/activemq)

- [Apache Pulsar](https://pulsar.apache.org/)

2. Message-Bus

- [mbassador](https://github.com/bennidi/mbassador)

- [rmq](https://github.com/xetorthio/rmq)

3. Frameworks

- [Apollo](https://spotify.github.io/apollo/)

- [lagom-framework](https://www.lightbend.com/lagom-framework)

- [micronaut](https://micronaut.io/)

- [eureka](https://github.com/Netflix/eureka)

- [helidon](https://helidon.io/#/)

- [armeria](https://github.com/line/armeria)

4. RPC

- [Protocol Buffers](https://github.com/protocolbuffers/protobuf)

- [gRPC-Java](https://github.com/grpc/grpc-java)

- [thrift](https://thrift.apache.org/)

15. [Java-Patterns](https://github.com/iluwatar/java-design-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](https://github.com/Alikhll/golang-developer-roadmap)

The roadmap is built using [Draw.io](https://www.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](https://compressor.io/compress)).

- Open a pull request with improvements

- Discuss ideas in issues

- Spread the word

[](https://creativecommons.org/licenses/by-nc-sa/4.0/)