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May 15, 2022 · 4 min read · I don't deal with the exact concept of Monad, but try to look at the form used by Java Optional from a Monad application perspective. Monad has a variety of applications and Optional is one of them (Optional are also called maybe monad). The terms ...
Join discussionMay 8, 2022 · 2 min read · If we make java.util.Date object, basically log format is below. Sun May 08 18:03:23 KST 2022 Our team has an old system that is more than 10 years old so we are developing for renewal. The legacy program log format likes above. But We have to make s...
Join discussionApr 30, 2022 · 1 min read · Variable s has string value. If I put that variable in Integer.valueOf method, I must encounter NumberFormatException. But It's not important. I just want to make exception. Let's see the below code. I can log variable s and exception e together usin...
Join discussionApr 24, 2022 · 1 min read · This episode story is simple. If we receive response that is list type, we can use flatMapIterable operator(finally return type is Flux). Sometimes, I found the Mono<List<T>> type. public Flux<String> getData() { return this.webClient.get() ...
Join discussionApr 17, 2022 · 2 min read · Let's imagine we received the WebClient response data and then binding to ResponseDto. Message value in ResponseDto can be null. public class ResponseDto { private String id; @Nullable private String message; public String getMessag...
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