In the previous article, you learned about the history of Java threads and how Quarkus helps developers execute traditional blocking applications on top of the virtual thread (Project Loom) dead simply using a single @RunOnVirtualThread annotation on both method and class levels. 

Unfortunately, there’s a long way to go with the virtual threads across all Java ecosystems. For example, you probably get used to importing Java libraries such as Maven dependencies or Gradle modules in your Java projects. It means you might not know how the libraries work on platform threads, or you don’t even need to know it because you just need to use them, which is the common development practice. With a vast ecosystem of Java libraries, you will probably hit the following challenges and pitfalls that could break the virtual thread runtimes in the end.

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