Enterprise Java
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flatMap() vs. concatMap() vs. concatMapEager() – RxJava FAQ
There are three, seamlessly similar operators in RxJava 2.x: flatMap(), concatMap() and concatMapEager(). All of them accept the same argument – a function from…
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Eager subscription – RxJava FAQ
While teaching and mentoring RxJava, as well as after authoring a book, I noticed some areas are especially problematic. I decided…
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3 Often-Overlooked Key APM Features
Core APM features aren’t going to be enough anymore. Market-leading apps are going above and beyond, setting new standards that…
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Spring Boot with the Justice League
Dark times are ahead for the Justice League with the formidable Darkseid coming over to conquer human kind. Batman with…
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Spring Retry, because Winter is coming
OK, this is actually not about the winter, which as we all know has already come. It is about Spring…
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Grails 3.3 Integration Testing with Spock Mocks
It is easy to use the Spock Framework, shipped with Grails, to mock or stub a collaborator (such as a…
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Basic API Rate-Limiting
It is likely that you are developing some form of (web/RESTful) API, and in case it is publicly-facing (or even…
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Apache Ignite with Spring Data
Spring Data provides a unified and easy way to access the different kinds of persistence store, both relational database systems, and…
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Instrumenting Java Web Applications without Modifying their Source Code
Most Java Web applications use standard Java interfaces when interacting with other systems. HTTP-based services like Web-pages or REST servers…
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