I am using JGraphT for holding about 150,000 (or thereabouts) vertices in an in-memory graph. This a directed graph and each vertex is going to have { 0 | 1 } outgoing edges. I want to find retrieve the set of vertices which have no outgoing edges. Here’s what I have attempted: This perhaps, is a naive attempt. I am
How to change Textview text in Activity from class that extends RelativeLayout
In my MainActivity I have one TextView. Now, inside other class that extend Relative Layout, I have implemented one MessageListener that (using onNewMessage method) recieve every second some values. I want to put this values inside my TextView that are in MainActivity. This is a simply example of my class: Thanks for help. Answer If you call this Class in
Model and list do not match when converting from java to kotlin
Whatever a video is made on Youtube, I do the same, Java language is used in the video, and I try to do it with Kotlin. I do exactly the same. I tried all the situations but could not fix them. I …
Does Lombok’s @AllArgsConstructor Autowire the fields in spring boot automatically?
I am following a YouTube tutorial to build a spring boot application. The person used lombok and so he didn’t had the @Autowired annotation on any field of the class and his code works fine. However when I tried the same, the console shows the service is null. Appropriate code and Output Screenshot attached for reference. } On removing the
How can I accept an argument list in a constructor and add it to a collection in Java?
I’m trying to make a constructor that would accept any number of variables of class “Item” as a variable argument list and add them to appropriate collection. What would be the best way to go about it? My code so far: Answer Item… args should be fine.. You can then just do this … instead of the static items block.
Conversion Error on LocalDate attribute when form-data request is sent to a Spring boot application
I send a form-data request from the Postman to a spring application. The LocalDate field in the Spring application as a text field from the form-data. I got a Conversion Error. Field error in object ‘vehicleDto’ on field ‘leasingExpiry’: rejected value [2021-01-01]; codes [typeMismatch.vehicleDto.leasingExpiry,typeMismatch.leasingExpiry,typeMismatch.java.time.LocalDate,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [vehicleDto.leasingExpiry,leasingExpiry]; arguments []; default message [leasingExpiry]]; default message [Failed to convert property value
How to tell if a reaction is removed by a discord bot using JDA?
I have a MessageReactionRemoveEvent in my code and it triggered whenever a reaction is removed. However, I also have my bot executing some automatic reaction removal (removing the user’s reaction). I want to prevent MessageReactionRemoveEvent triggered when the reaction is removed by a bot. My code for preventing MessageReactionRemoveEvent triggered by a bot: But the getUser() method in MessageReactionRemoveEvent always
JVM code cache exceeds ReservedCodeCacheSize
I have a java app running in a docker with flags on OpenJDK8: and I’ve noticed that Code Cache memory allocation reported by Native Memory Tracking tool exceeds 240MB (default ReservedCodeCacheSize value): which is ~ 254MB reserved memory. Here’s printed flag and java version: My question is if this is expected behavior? If yes, then is it possible to calculate
No Mapping for GET /WEB-INF/jsp/login.jsp
Please find this project on GITHUB as studentsbooks I am getting errror as below, even after following a proper tutorial. Kindly guide where i am going wrong. Feel free to clone the project. Committed Just now. Answer I created a class InsertInitialData class annotated as @Component and used WebApplicationContext with autowired annotation. Thymeleaf uses context to get initialized please find
Junit Force to throw Exception on method call
I am trying to throw the exception whenever simpleJdbcCall.execute(namedParameters) called but I see it is not throwing the error, is there something i am missing here ? Here is my class here is my Junit Class Answer When writing spring-boot integration test you should inject the mock beans using @MockBean annotation You can a follow some of the examples here