# Foojay Podcast #52 from JCON in Cologne! > Garbage Collectors, Intelligence Cloud, Test Containers and Flaky Tests, ToxiProxy, Structured Concurrency, and Virtual Threads! - URL: https://foojay.io/today/foojay-podcast-52/ - Published: 2024-06-10 - Authors: Frank Delporte, Gerrit Grunwald - Categories: CRaC, Java, Java Core, Podcast, Security, Testcontainers, Testing This is part 4 of the JCON interviews! In this episode, we have 5 new guests for you. * We start with garbage collectors and Intelligence Cloud, a tool created by Azul to find out which of your code is actually used in production and which dependencies are known to have vulnerabilities. My colleague Gerrit Grunwald was at JCON to give a talk about these subjects. * With Balkrishna Rawool we dove into Virtual Threads, a very interesting topic as concurrency and threads can be challenging... * Piotr Przybyl came to JCON to give a talk about Test Containers and how to test your application in an environment that is similar to your production environment. Another important topic related to testing is Flaky Tests. How do you handle tests that only fail from time to time and make your whole test report unreliable? * François Martin had a talk about this subject, and he came to the conference together with Annelore Egger, who was one of the many volunteers. ## Video {{< youtube 9q7kSibmVBA >}} ## Podcast Apps You can listen and subscribe to the Foojay Podcast on: * [Spotify](https://open.spotify.com/show/6CpTfgn9LirzJGAtc4ICdQ) * [Apple Podcasts](https://podcasts.apple.com/be/podcast/foojay-io-the-friends-of-openjdk/id1652281304) * And most others... ## Content 00:37 Gerrit Grunwald: Talks about Garbage collectors, What is Intelligence Cloud and how can you find out which of your code is actually used in production and which dependencies are known to have vulnerabilities 09:55 Balkrishna Rawool: Talks about structured concurrency, virtual threads, what will come in the next Java releases 18:00 Piotr Przybyl: Talks about Test Containers, ToxiProxy, how to test your applications in an environment that is similar to your production environment. 29:23 François Martin: Volunteer JCON + Talks about Flaky Tests, how to handle waits in unit tests, how to do user interface tests, how to reproduce flaky tests. 38:09 Annelore Egger: Volunteer JCON + Visitor + the Java comm