Friends of OpenJDK Today

Table of Contents Receiving mailsConnecting to the ServerProcessing MailsSanitizing received MailsUsageTesting I was recently in need to write some small demo project which was receiving and processing mails. There is a lot of documentation for sending mails, but gathering information …

Table of Contents What are the Application Observability Code Challenges?GoalsWhat do the code challenges look like?Your own stackOnline environment(s)The first challenge🛠️ How to Get StartedChallenge details Code challenges are a nice way to challenge yourself with programming, resulting in some …

Table of Contents ExampleException tableBytecode instructionsTry-catch-finally flowLess nice flowSummarized flow It’s interesting to know how the JVM runs bytecode instructions… But do you know what is going on when an exception is thrown? How does the JVM handle the delegation …

Table of Contents IndexHow It Works1. Define a Window Interval2. Track Requests3. Reset Counter:4. Rate Limit Check:How to Implement It with Redis and Java1. Use the INCR command to increment the counter in Redis each time a request is allowed2. …

Table of Contents VideoPodcast (audio only)GuestsSouJava (JUG Brazil)Content With the first Foojay podcast of 2025, we want to help you to boost your career! By now, you’ve likely had your year-end performance review with your manager and set some goals …

Table of Contents JCmd triggered debuggingSummaryProblemSolutionConclusion Almost to the day, one and a quarter years ago, I published my blog post called Level-up your Java Debugging Skills with on-demand Debugging. In this artucle, I wrote about multiple rarely known and …

From expanding the OmniFish team to pushing the boundaries of what GlassFish and Piranha can do, this year has been nothing short of transformative. Let’s take a look back at some of the highlights and share our hopes for an even brighter future.

Table of Contents The Home Assistant Community StoreAdaptive LightingConclusion In the previous post of this focus, we replaced Philips Hue automation with the one from Home Assistant. One significant gap we noticed was that Home Assistant doesn’t automatically adjust the …

Table of Contents Why Redis for Rate Limiting?Popular Rate-Limiting PatternsLeaky BucketToken BucketFixed Window CounterSliding Window LogSliding Window CounterChoosing the Right Tool for the JobUnderstand Your Traffic PatternsAssess the Level of Precision NeededConsider Resource ConstraintsAccount User ExperienceStay curious! This article is …

Table of Contents The scenario: The complex objectThe traditional approach: Telescoping constructorsFavor Static Factory Methods over Class ConstructorsMany parameters? Use the Builder patternRestricts the order of method calls in the Builder patternConclusionKey TakeawaysFinal Thoughts We often hear the phrase: “Make …

Table of Contents PrerequisitesCreating the Analytics ComponentUsing the ComponentStep 1: Add To Main LayoutStep 2: Track Custom EventsHow It WorksBest PracticesCommon Use CasesConclusion Want to track how users interact with your Vaadin Flow application? Learn how to integrate Google Analytics …

Upgrading from Spring Boot 2 to 3 forced me to define my configuration properties in a better way.