My Configuration Class is below:- The DTO is :- The Snippet for publishing the message is:- And the snippet to listen the message is:- The issue is the logs here are not coming up but if I try with The snippet below then it works:- it does goes to the logs but how to get the TestDto in that case?
Implementing a resource read/write lock in Java
I’m trying to implement a simple read/write lock for a resource accessed concurrently by multiple threads. The workers randomly try reading or writing to a shared object. When a read lock is set, workers should not be able to write until the lock is released. When a write lock is set, read and write are not permitted. Although my implementation
Spring boot cannot resolve view page
I am trying to run a simple web application with using Spring Boot but there is a problem with resolving view. When I go to http://localhost:8080/ it shows; Is there any missing property or library? Why it cannot resolve my html page? My application.properties; Answer If you use spring boot with some template engine, for example, thymeleaf. You don’t need
No serializer found when serializing one Object
I’m trying to return an Object as JSON. Using the /user/id endpoint, I want to display a User based on his Id. When calling this controllerMethod I get the following Exception: My contollerClass looks like this: I checked if al fields have a public getter and tried various options with @JSONIgnoreProperties, but I can’t find it. Displaying all users as
Pc audio to android = noise
I have a problem with a project of mine. The project is a voice chat, where you should be able to talk to each other across devices. The project works fine when 2 pc clients is talking. When a pc …
Where can I get the LIB file import javax.xml.bind.DatatypeConverter;
I have the following line of code which is giving me a where can I find the library file for this import? Answer The module javax.xml.bind has been renamed and is also deprecated as of Java 9. To workaround you can add –add-modules java.xml.bind to javac compilation. As suggested here Or switch back to Java 8 or older
Access the keycloak API from postman
I have tried to access the keycloak API from the postman. but it is showing 400 bad request. I was calling api in the below format. In the headers I have set the content_type as application/x-www-form-urlencoded I am getting the response as below. Can any one help me.Any help will be appreciated. thanks in advance Answer A bit late for
Java Fork/Join Pool : Is it right to assume that number of threads in fork join pool depends entirely on underlying number of CPU’s?
Can a developer tell fork/join pool to create certain number of threads? If yes then is it guaranteed that those many number of threads will be created by pool? Answer Source : https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ForkJoinPool.html A ForkJoinPool is constructed with a given target parallelism level; by default, equal to the number of available processors. The pool attempts to maintain enough active (or
What is the difference between em.remove(st) and em.remove(em.contains(st) ? st : em.merge(st));
I was getting this error: Then I search for it in stackoverflow and I found this solution: instead of: I am using now: But I really didn’t get why is it working now. Can someone tell me the diffrence between this methods? Answer @ why is it working now, EntityManager works only with ManagedEntities. When you try to remove an
Lombok causing “Actual and formal arguments lists differ in length error”
I have the following class: When the @Builder annotation exists, it is causing problems with the @NoArgsConstructor. I am getting the error: Answer Add @AllArgsConstructor as well and this should fix the issue