I created a interface which has not any implementations Can MyInterface be annotated by @Autowired? following error displayed when it run Answer No you can’t, because Spring tries to instantiate it to create a Bean (@Service), but it’s an Interface, so thats not possible.
Tag: java
Unable to delete .mp3 file due to javaFx MediaPlayer
I am working on my Hhighschool capstone. It is a program where the user can download songs from the internet and store them in an organized manner and play them. My program must contain a feature where the user may delete a specified .mp3 file by simply pressing a button. I have tried the .dispose() method on…
Could not find maven-metadata.xml in local during release
I have a local Eclipse RCP project on my Windows machine. One of my remote repositories is used for development and the other for staging during release. The tools used during build and release are Maven, Git, SSH and GitHub. I can build and run tests without any issues: but when I perform a release prepare: …
How do I write a test for a service that uses other services in Springboot?
I have a BookManagementService that uses the @Autowired implementation of three other services, like so So how do I mock the aforementioned services and their repo in the BookManagementServiceTest? When the test start running and it gets to the yearService layer, it throws a NullPointerEXception cause the yea…
An issue with Generic type parameters and Inheritance
Couldn’t concretize the title, sorry for that. For example, we have a Parent class and a Child class: And a class that can contain Parent’s child in its field called a: Let’s create an instance of that class and try to assign a value to a: So far, so good. But let’s say we want to move…
Grid View Items are displayed too small: Java Android Studio
I am implementing a grid view in java Android Studio to show all the images from gallery into it. Everything works fine but my grid view items are being displayed very small. There is a lot of spacing left horizontally between columns unnecessarily which makes the items small. This is my activity xml file hav…
Problem of type inference and type variance for Reactor/WebFlux
Let’s say there is an interface and its implement class as: And then, for the method Mono<InterfaceA> getMonoA(), the following implementation causes a compile error: It makes sense that the invariance type Mono<InterfaceA> is not the super class of Mono<ClassA> even if InterfaceA is t…
Why are multiple sockets created by one client
Multiple sockets created by one client The task is to create a server-client communication with sockets. The client is the browser and it requests an html file. The server listens and accepts the connection if a request is made. I would like to create one thread/client (persisten connection), but can’t …
I want to swap characters of string in java but it returns garbage value can you please tell me what is wrong with my code
I want to swap characters of string but this program returns garbage value. Can you please tell me what is wrong with my code. Answer You have to use constructor of String class. Then it will work fine.
Kotlin Android Studio: org.junit.ComparisonFailure with NBSP
I have this code And I get this Error And This Comparison Failure Answer I encountered the same issue with the NBSP sign! Spent some time to figure out what to do with the tests TL;DR: Pass locale in your string formatters For tests of locales that use NBSP instead of a space (French, Ukrainian etc.) paste th…