I’m currently working on my homework about client and server topic: I created a class called VehileRequest.java which will take three variables (year, make, model) from Client.java and pass them to Server.java then the Server will get information from VehicleRespone.java and display the information abou…
Tag: java
Spring Boot + Infinispan embedded – how to prevent ClassCastException when the object to be cached has been modified?
I have a web application with Spring Boot 2.5.5 and embedded Infinispan 12.1.7. I have a Controller with an endpoint to get a Person object by ID: The following is the PersonService implementation with the use of the @Cacheable annotation on the getPerson method : And here is the Person class: I configured in…
How to properly define a Controller in Spring MVC compared to a JavaFX Controller
I’m having a hard time trying to understand the differences between a JavaFX Controller and a Spring MVC Controller. I came from a JavaFX background and I have seen many differences between a Spring MVC Controller vs a JavaFX Controller and I am currently working with Spring MVC. There are important dif…
What kind of threading model changes led to DMLC
The doc explains why DMLC was introduced in version 2: https://docs.spring.io/spring-amqp/reference/html/#choose-container This architecture was required because, in early versions of the RabbitMQ client, multiple concurrent deliveries were not possible. Newer versions of the client have a revised threading m…
Why does Thread.activeCount() count more threads than my code creates?
I’m a beginner in Java development and i trying to write a multi threading process with using CountDownLatch in below code. But ExecutorService not working as it should. ExecutorService thread number not working as it defined in code. Console log; I defined thread number as 50, but when it works Thread.…
React native firebase crashes when using emulator
I’m struggling for a few days now on using firestore emulator in a react-native project Whenever the code reaches a firestore hit the application crash without any log (RN side). Now I know RNFirebase is well installed as I can hit firestore real server. I’ve checked the logcat and it gives me thi…
Add/Subtract/etc element by the next element in an array
I have an array with [25, -6, 14, 7, 100]. The expected output is Basically, the next element is subtracted/added to the current element when looping. That sum and product is easy as I only need to do The problem is that when I do difference -= i, it gives me -108, which is wrong. And when there is only
Issue with addressing variables from different method
I am just learning to code in Java and ran into a problem. The task description was following: “The class SalaryCountingWithMethods below asks for three floating point numbers (work hours, salary per hour and tax percent) and then counts the salary before and after taxes as well as the tax part of the s…
How to know that provided URL is Image or Video in Android Studio
I am Using Firebase as Database where user can Upload Image or Video so I am Fetching URL from my database so I am getting two URLs one of them can be either video or image so what can I do to detect the URL. Let Suppose this is the URL. This is the example URL. NOTE URL can be
Reverse subset of ArrayList using multidimensional ArrayList in Java
I am trying to reverse a sublist in a List using the indices provided in a multidimensional List. I don’t have much experience using multidimensional lists/arrays. I don’t understand why this doesn’t work. The output of this code using [[0,1], [1, 3]] as the indecies is: but it should be: Ca…