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Tag: java

Spring SmartLifecycle start() method not executed

In my spring app I have a thread pool manager that during start() creates some threads and add those to the pool. But while running the start() method is never executed. Any help will be really appreciated. Answer This is for someone facing similar problem. isRunning() is called before start() therefore make …

How to swap the first vowel and last vowel of a String using Java?

I am making a method called “Swap” where it takes in a string in the parameters. My goal is to swap the first and last vowel of the String. That’s it. My way of finding this goes like this: (fVowel is the index of the first vowel) (lVowel is the index of the last vowel) (newWord is a string …

Java counter + random numbers [closed]

Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 1 year ago. Improve this question I am trying to generate random number, but also I want to count how many times does it take t…

Java Stream API – Group by items of an object’s inner list

Is there a way to achieve the following example code, leveraging Java Stream API rather than having to create a HashMap and populate it inside double forEaches? I was trying to play around with groupingBy and flatMap but couldn’t find a way out. Having a list of Movies, where each one has a list of genr…

How would you execute this on VSCode?

I’ve found the following code online but don’t know how to run it on IDE as I’m new to Java could you please help. I tried creating a class and copy-pasting the code but couldn’t manage to produce any output. Super stuck and am still a novice. Doing it by hand I think it should output …

Jackson deserialise JSON with many dynamic nodes

I’m trying to deserialize a JSON file with the format of But I don’t want to create a class for each language (thousands) so I wrote a custom LanguageDeserializer which gives me back the List<Language> that I want I have a parent class to wrap the results: So when I try and use it The langua…