simply about difficult
Suppose 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 MOREIf you trying to build your project with tdlib on MacOS M1 (Apple Silicon chip), you probably are gonna face this error: You need to compile these natives for aarch64 architecture. The final artifact will be named as: tdlight-natives-osx-aarch64. NOTE: If you want to take compiled artifact, just download it from my repo, then put into […]
READ MOREIf you working with IntelliJ IDEA you may notice, that changing Project’s JDK version is not affected to Gradle build/run. To force Gradle to use a specific JDK version / vendor you merely need to change Gradle JVM version in IntelliJ IDEA settings: Settings → Build, Execution, Deployment → Build Tools → Gradle → Gradle […]
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 MOREThis article helps you in such cases: There are at list two reasons of such problems: 1. This dependency is transitive for other dependency, not that one, where you made exclusion. Thus you need to add exclusion tag somewhere else (if your exclusion is located in section, not plugin-level). mvn dependency:tree is very useful for […]
READ MOREEven though you may want to merely copy & paste the code below, I suggest you firstly explore carefully the article describing how Java logging works, what is slf4j, what is log4j, what is bridge and how it works: https://mchesnavsky.tech/how-the-java-logging-should-works/, and then return back. In this article you’ll find the answers for these questions: Suppose […]
READ MOREIn this article you will find the answers for these questions: Let’s start To begin with, there is two main concepts in Java logging: The problem Suppose the you’re Java library developer (let’s say it’s called our_library), not standard Java application developer. You need to have logging in your library. Suppose you have chosen log4j. […]
READ MOREOne day you may face this error: Full exception text is: Firstly, you need to check that user from which your Spark working on, has home folder under /user like that: /user/John_Doe. If you already have that folder, try to grant access to /user dir. If you unable to grant access to that directory or […]
READ MORESuppose we need to work with different HDFS (clusterB, for instance) from our Spark Java application, running on clusterA. Firstly, you need to add –conf key to your run command. Depends on Spark version: Secondly, when you creating Spark’s Java context, add that: You need to go to clusterB and gather core-site.xml and hdfs-site.xml from there (default location for Cloudera is /etc/hadoop/conf) […]
READ MORE