simply about difficult
First things first, we can generate the starter project using https://start.spring.io/. Select these dependencies: Then, using documentation here we should set API Key, Application Key and Datadog URI in application.properties file: You can get your API Key and Datadog URI from startup Datadog screen: By the way, Datadog has a trial period. Application Key can […]
READ MORESuppose you have Spring Boot actuator in your application, and you want to access metrics programmatically. Or you want to gather a lot of system/application metrics initially. After you enable the Spring Boot actuator in your application (https://www.baeldung.com/spring-boot-actuators), just autowire all actuator auto wire candidates: You can use them like this: That’s all.
READ MORESuppose you want to serialize some object to JSON. You may encounter the exception: We need to do two steps: Firstly, let’s add dependency from https://mvnrepository.com/artifact/com.fasterxml.jackson.datatype/jackson-datatype-jsr310. Next, let’s register JavaTimeModule within ObjectMapper: If you working with Spring or with some other framework, ObjectMapper can be instantiated implicitly. You need to override instantiation by yourself. For […]
READ MOREYou may encounter exception, that states: The reason is JDK/JRE version and vendor. I noticed, that at least JBR-17 (JetBrains Runtime) hasn’t got L32X64MixRandom algorithm. You may want to switch to Azul-17 (Azul Zulu) to make it works again. If you build/run your application with Gradle, don’t forget to change Gradle JVM version in IntelliJ […]
READ MORELet’s suppose that you need configure a TCP server in Spring / Spring Boot application. We will make it that the server prints the client’s request on the screen, then sends a response to the client. First, let’s include the spring-integration-ip dependency. In Maven it will look like this: Like gRPC ideology, in this case […]
READ MOREFull exception text: Most likely, this error occurs due to the old metrics that came from Spring Boot 1 used together with Spring Boot 2. If you urgently need to start the application, then as a workaround, you can disable one of the metrics modules in this way: find the place in your application where […]
READ MOREFull text exception text: Spring Boot 2 is no longer support MetricsRegistry by default. If you want to continue using the MetricsRegistry for your own purposes, just create a new bean:
READ MOREImagine an error or exception occurs while running the Spring Boot Yarn container, and we need to kill container from itself and return an error code. You can use @OnContainerStart annotation as mentioned in this article: https://mchesnavsky.tech/how-to-set-up-exit-code-on-spring-boot-yarn-container. But if we need to stop the container immediately, we just need to call: – where parameter is […]
READ MOREIn the previous article, we already figured out how to terminate a container with a specific exit code. To begin with, the return value must be smaller then 256. You can notice that: If you terminate the container with a code of 0 or some other positive number, then the same code will be sent […]
READ MOREYou need to mark container’s start class using the @YarnComponent and mark method with the @OnContainerStart annotations: Despite the fact that the description of the annotation says that it cannot return anything, the return value works. We make the return value of type int. 0 – means successful shutdown of the container, non-zero values – […]
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