# HowToDoInJava: Java, Spring and Hibernate Tutorials

> Simple and easy\-to\-follow free tutorials on Core Java, Spring, Spring Boot, Maven, JPA, Hibernate, JUnit, Python and other popular libraries\.

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## Pages
- [Dropwizard Tutorials: REST Services With Dropwizard 5](https://howtodoinjava.com/dropwizard-tutorials/): Dropwizard tutorials for Dropwizard 5 and Java 25: hello world REST API, health checks, HTTP client, basic auth security and common startup errors\.
- [About HowToDoInJava and Lokesh Gupta](https://howtodoinjava.com/about/)
- [Java Tutorials](https://howtodoinjava.com/)
- [JUnit Tutorial: Learn JUnit 6 and JUnit 5 With Examples](https://howtodoinjava.com/junit-tutorial/): JUnit tutorial for JUnit 6\.1\.3 and JUnit 5\. Learn the Platform, Jupiter and Vintage, follow a beginner path and find a guide for every JUnit annotation\.
- [Java 8 Features With Examples and Java 25 Updates](https://howtodoinjava.com/java-8-tutorial/): Java 8 features explained with short examples, from lambdas, streams and Optional to java\.time, plus what Java 25 changed and how to migrate\.

## Posts
- [Dropwizard Client Configuration with Jersey and HttpClient](https://howtodoinjava.com/dropwizard/client-configuration-and-examples/): Dropwizard client guide with JerseyClientBuilder, HttpClientBuilder and config\.yml settings for timeouts, connection pool, retries, gzip, TLS and tests\.
- [Dropwizard Basic Auth Example With @Auth and @RolesAllowed](https://howtodoinjava.com/dropwizard/dropwizard-basic-auth-security-example/): Dropwizard basic auth example with dropwizard\-auth: Authenticator, Authorizer, BCrypt password hashes, @RolesAllowed, caching and tests for 401 and 403\.
- [Dropwizard Could Not Resolve Type Id 'http' Error: Fix](https://howtodoinjava.com/dropwizard/solved-dropwizard-failed-parse-configuration-not-resolve-type-id-http-subtype/): Fix the Dropwizard error Failed to parse configuration, could not resolve type id 'http' as a subtype of ConnectorFactory: add the Shade services merge\.
- [Dropwizard Tutorial: Hello World REST API Example \(Java 25\)](https://howtodoinjava.com/dropwizard/tutorial-and-hello-world-example/): Dropwizard tutorial with a hello world REST API on Dropwizard 5 and Java 25: configuration, resources, fat JAR, ports, health check and JUnit 6 tests\.
- [Dropwizard Health Check: Configuration and Examples](https://howtodoinjava.com/dropwizard/health-check-configuration-example/): Dropwizard health check examples with a custom HealthCheck, the admin /healthcheck, the health block in config\.yml, Kubernetes probes and JUnit tests\.

## Optional
- [Sitemap index](https://howtodoinjava.com/sitemap_index.xml)