Learn how to test a REST service that uses Keycloak for authentication and authorization with Swagger UI
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HTML to PDF Using OpenPDF
Learn how to convert HTML to PDF in Java using OpenPDF and Flying Saucer or using the Open HTML to PDF library, with a little help from Jsoup.
Creating a Self-Signed Certificate With OpenSSL
A quick and practical guide to creating self-signed certificates with OpenSSL.
Open API Server Implementation Using OpenAPI Generator
Learn how to generate a Spring-based server stub from a YAML specification using the OpenAPI generator’s Maven plugin.
File Upload With Open Feign
Learn how to implement a Multipart File upload using OpenFeign.
Differences Between Netflix Feign and OpenFeign
Compare the Spring Cloud integrations of OpenFeign and Netflix Feign.
Dates in OpenAPI Files
Let’s see how to declare dates in an OpenAPI file, in this case, implemented with Swagger.
Java Files Open Options
Learn about the several options when opening files in Java.
Java IOException “Too many open files”
Learn when and how to avoid the “Too many open files” exception in Java.
OpenAPI JSON Objects as Query Parameters
Learn how to specify JSON objects as query parameters using the OpenAPI specification.
Quick Guide to Spring Cloud Open Service Broker
Learn how to implement the Open Service Broker API using Spring Cloud Open Service Broker.
Spring REST Docs vs OpenAPI
Explore the differences between the OpenAPI based springdoc and Spring REST Docs.
Open/Closed Principle in Java
Explore the Open/Closed Principle (OCP) as one of the SOLID principles of object-oriented programming in Java.
Intro to OpenCV with Java
Learn how leverage OpenCV with Java
Introduction to Open Liberty
Learn how to use the Open Liberty framework to create and consume a RESTful web service
Spring Security and OpenID Connect (Legacy)
Learn how to set up OpenID Connect (from Google) with a simple Spring Security application.
Documenting a Spring REST API Using OpenAPI 3.0
Learn how to generate OpenAPI 3.0 specifications for a Spring REST API using SpringDoc.
A Guide to Spring’s Open Session in View
Learn about Spring’s Open Session In View pattern
Introduction to Spring Cloud OpenFeign
Feign makes writing web service clients easier with pluggable annotation support, which includes Feign annotations and JAX-RS annotations.
Differences Between Oracle JDK and OpenJDK
Explore the differences between Oracle Java Development Kit and OpenJDK.