Roy

I am puzzled by a Java data type question. I would assume that a primitive boolean would only take 1 bit of storage, but it seems it takes 8 bits (according to Oracle JVM doc)...

I have a SprinBoot Controller which accepts single piece of data, and returns the output. Example ResponseEntity singleController(Data data, HttpServletRequest hsr) Now I ...

I have to execute a build which generates a WAR file. I see that the checksum for every WAR generated is always different from the last inspite of no code changes. I came acro...

you know how to write a for loop?

I have a singleton class with a mutable map as a instance variable inside it. I am using the map as a cache. This map can be updated asynchronously based on some external even...

I have a method method1 which should return a Map, the instance of which is a LinkedHashMap. This method gets called from another method method2 which expects the values in th...

I don't understand how it is an anti-pattern? It is what it is, not everything should be pattern or anti pattern

I have an entity called a User, and want to create a "follows" relationship, like a User following another User. Of course, a User can follow multiple `User`s. How can I do it...

I was wondering if there was a way to achieve the following: I have a class, say Students. This class has a method called put which accepts a Map. However, is it possible for...

How can I get the default Spring Boot Log pattern even when I define new custom appenders through log4j2 using YML file?

How can I alter a table with Enum columns and convert it into a String?

Has anyone implemented a cuckoo filter? I have a hard time in understanding how much memory would it require, for say 1000 elements with 1% false positivity rate

Hey all, I just created a new Java EE application to try out CDI with it. I also created a service, and tried to use @Inject through it, but the service is always null. Note t...

What response do you get?

How to determine if a class is loaded in the Java namespace? I was looking at some article which referred to namespace pollution and wanted to verify how that could be determi...

Does updating a value in a row rewrite the whole row or just the value? I know this might be a stupid question, most likely it will just update the specific column, but I just...

I have a Spring Boot application with a properties file called abc.properties file in the resources folder. As Spring Boot provides externalized configuration, I do not want t...

I am writing a REST API which accepts a JSON as input. Spring Boot automatically converts it into a POJO. However, the JSON that I have has the following structure. { "stra...

In https://www.baeldung.com/java-constants-good-practices it says > Our CalculatorConstants will now be in the namespace for any of our classes that implement the interface ...

I have a database D1 in which I have a table T1. D1 also has a stored procedure S1 which operates on T1 Now I want to move the table T1 from D1 to D2. Is there a way to keep ...