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…
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…
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 @JSONIgnoreProper…
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 …
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 ad…
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 pa…
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. Whe…
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