I would like to do something like below. A and B class will be my generic type as <T>. Example for a getter function for class A and B. I want to pass a getterFunction as argument to my sliceGenericData() and I would like to use it on type <T> (Class A or B). Since those classes have different nam…
Tag: java
How to return a custom response for validation errors using Hibernate Validator and Quarkus
I implemented a REST endpoint in my Quarkus application. For validation purpose I’m using the hibernate-validator. So I added the @Valid annotation to the incoming parameter and added some constraints to that class. Everythings works as expected. When sending a request with invalid data I see a response…
Not able to create generic bounded class objects with interface
I am trying to use bounded types with generics to create generic objects of subclasses (these implement an interface). But I am getting type mismatch errors when initializing objects with the subclasses. Here is the interface: Here’s the class that implements this interface: Now I created 2 classes (Seg…
How to write a JUnit test case for ArrayStack methods
I am implementing an ArrayStack and we have to create a tester for it with JUnit and I wasn’t sure what to add to check if these two methods are working. The method addAll appends all values from the given list into the other list. Equals checks if two ArrayStacks are equal. I think I would have to crea…
Removing run / fork := true from sbt results in [runtime, notfound] exception, and if not removed i can’t take user input from console
*if run / fork := true is removed from sbt then: Caused by: java.io.FileNotFoundException: /Users/ajitkumar/Downloads/flice/sensor-nws/target/bg-jobs/sbt_4be36759/target/135c9252/81ecd14d/hadoop-client-api-3.3.1.jar (No such file or directory) if not removed the below code results in Answer The problem gets s…
How to write JUnit Test for uploading Image in Amazon S3 in Spring Boot
I have a problem about writing a test to upload Image in Amazon s3 in Spring Boot. I tried to write its test method but I got an error shown below. How can I fix it? Here is the method of Rest controller Here is the method of imageService. Here is the test method shown below. Here is the error
Java validation vehicle registration
I’m trying to do a simple validation for vehicle registration number. It must include “-” Dash/Hyphen symbol. Example: BIR – 5698 It allows Numbers/Letters and Hyphen symbol only. All the other symbols are invalid. ( `~!@#$%^&*()_+=./;,<>”:|[]{} ) My code – Thank …
Syntax error on token “void”, record expectedJava(1610612940)
I am trying to make a program that would translate english into pig latin. I have written my code however i keep getting the error “Syntax error on token “void”, record expectedJava(1610612940)”. Thank you. Answer First, you need a class to put in you main() method With this your code …
Is JVM or JIT able to reduce duplicate method calls?
I have a function that checks if a map has some value for key (map.get(key) != null) and then returns the value, or else create new value. I’m wondering is there any JVM or JIT magic that doesn’t have to do 2 map lookups when the value exists for the given key? According to my benchmark, it seems …
Is it possible to avoid duplicate values from being inserted in a Red Black Tree?
This is currently my code for insertion in a Red Black tree. How would I make it so that duplicate values are not added in so that the tree doesn’t change? Answer Something like this