I am writing a new release of my Spring CQRS Module(link1, link2), including a parallel execution feature.

However I am encountering several issues with the Java 8 promises aka CompletableFutures.

My issues are :

• I am using a dedicated ForkNodePool but some promises are stilled created outside my pool
• Some threads are slow to die (WAITING state is too long)
• Completable.allOf is creating promises in the common ForkNodePool
• I had an exceeded waiting thread exception

Here is two links that are helping me a lot to solve these problems :

• Java Parallel Calamity : link
• The Java Fork/Join Framework : link2

These two articles are well documented and explain into the details how Java/Threads/Java/JVM/Promises and parallel streams works.

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Parallell issues with Java software : useful links to troubleshoot - Digital Transformation and…