Services can often be optimized with asynchronous processing even without changing their behavior towards the outside world. The reason why some services aren’t efficient is that they need to wait for other services to provide a result to continue further. Let’s look how to call external REST services without waiting for them and also do multiple parallel calls independently and combine their results later with a reactive pipeline in Java EE 8.

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In June, I had a public presentation at a Java User Group in Prague. It was the first time I gave my new talk about building reactive applications with Java EE. And as a bonus, I wanted to introduce Payara project and how it relates to the GlassFish project. (more…)

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