Hi I have been working on a space invader game in processing, I am relatively new to java/coding. What my problem is that I do not really understand how to make the collision actually work, and also my aliens (which are the space ships), they move left to right but do not move down. These are the 2 major prob…
Tag: java
How do I get a JwtAuthenticationToken for my HandlerMethodArgumentResolver from the request’s Authorization header?
I have a Spring Boot application that requires a JwtAuthenticationToken passed in a HTTP Authorization header. The header itself provides a bearer token; Spring is doing some magic that I am currently unaware of to convert that bearer token string into a JwtAuthenticationToken. I have some code that extracts …
get kth-largest-element-in-an-array – implemented using maxheap but getting time exceeded in leetcode
I am trying to solve this leetcode challenge . I implemented a MaxHeap and tried to popout the values to get the Kth largest element in the array but I get a time limit exceeded. Is there any issue with my MaxHeap implementation that it is slow or can this be done in a faster method? Problem https://leetcode.…
invalid stream header – when publishing message manually on rabbitmq console
I have an application with spring-jms, spring-boot and rabbitmq-jms. When I try send a message and recieve by application runs successfully. But when I publish message manually on rabbitmq console I got error bellow on application listening: This is my JMS configuration Publishing message Consuming message li…
The dependencies of some of the beans in the application context form a cycle in Spring Batch
I’m working on a simple Spring Batch application, and when I finished configuring it, I found that problem: The dependencies of some of the beans in the application context form a cycle: jobRestController defined in file [/home/yassine/Downloads/demo/target/classes/com/example/demo/JobRestController.cla…
What does latency metrics represent in Flink and are them really valid to evaluate the latency of an application?
I’ve a pipeline developed as shown below: I’m thinking hard about a way to value latency from input to output, but the relation between input and output isn’t 1 to 1 but there are a lot of transformations that make the latency evaluation conceptually very hard. I know about the latency metri…
Bind @param in a Jpa repository native query inside single quotations
I am looking for a way to bind a given param in a native query where the value has to be inside single quotations, like so: However, when I try to run this, it results in hibernate not being able to bind the timeThreshold value as it is provided inside the single quotations ”. Does anyone know how this …
Spring Data cosmos @Transactions support
With Azure Cosmos DB transactional batch support available for Cosmos Java SDK 4.7.0, Does Spring Data Cosmos allows transactional operations? I went through Spring Data Cosmos Github Documentation, but didn’t find a reference. Need help if there is a way to implement transaction batch operations via sp…
x cannot be resolved or is not a field y cannot be resolved or is not a field
Main: Location: Foo class: When I try to run the program I get the “question title” error, I don’t know what that happens, and how to fix that. Answer One way is to use instanceof operator if you are expecting a type that you know. This is a demo. UPDATE As Stephen C mentioned that Foo class…
How to write async POST/GET in Java Microprofile correctly
I’m a C developer who needs to create a basic async REST server (synchronous version works fine) in Java using the Microprofile (Helidon MP) framework. Here is my strategy to do this: The client should do the POST call and provide JSON objects that the POST endpoint will receive. Then, the POST Endpoint…