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        <pluginManagement>
            <plugins>
                <!-- Last updated 2025-04-17 -->
                <plugin><groupId>org.jetbrains.kotlin</groupId><artifactId>kotlin-maven-plugin</artifactId><version>${kotlin.version}</version></plugin>
                <plugin><groupId>io.fabric8</groupId><artifactId>docker-maven-plugin</artifactId><version>0.46.0</version></plugin>
                <plugin><groupId>io.quarkus.platform</groupId><artifactId>quarkus-maven-plugin</artifactId><version>${quarkus.platform.version}</version><extensions>true</extensions></plugin>
                <plugin><artifactId>maven-enforcer-plugin</artifactId><version>3.5.0</version></plugin>
                <plugin><artifactId>maven-clean-plugin</artifactId><version>3.4.1</version></plugin>
                <plugin><artifactId>maven-dependency-plugin</artifactId><version>3.8.1</version></plugin>
                <plugin><artifactId>maven-compiler-plugin</artifactId><version>3.14.0</version></plugin>

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Maven super-short intro.

Note

Maven is declarative, not procedural. By default it is in XML, but you can write it in other languages.* We will use YAML.

 

Tip

Maven works on a principle of a “tree of trees” of build configuration overlaid over each other, which then create an effective tree - so called POM (project object model).

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[flyway/flyway:latest] "flyway": Start container 980e2f7f4081
: Usage
:     flyway [options] [command]
:     flyway help [command]
: 
: By default, the configuration will be read from conf/flyway.conf.
: Options passed from the command-line override the configuration.
: 
: Commands
:     help                     Print this usage info and exit

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PROTON_USE_WINED3D=1 %command%

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class StackBasedContext(
    val nestingStack: Deque<NestingLevel> = ArrayDeque(),
    val problems: MutableList<Pair<String, List<NestingLevel>>> = mutableListOf(),
) {
    override fun toString() = nestingStack.ifEmpty { listOf("(root)") }.joinToString("/")

    fun addProblem(msg: String) { problems.add(msg to nestingStack.descendingIterator().asSequence().toList()) }

    fun pushLevel(dataParam: KParameter): PopOnClose { nestingStack.push(NestingLevel(dataParam)); return PopOnClose() }
    fun pushLevel(collectionIndex: Int): PopOnClose { nestingStack.push(NestingLevel(collectionIndex = collectionIndex)); return PopOnClose() }

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import java.io.FileNotFoundException
import java.io.InputStream
import java.nio.file.Path

object ResourceUtils {

    fun getCallingClassName(): String? {
        var testUtilsSpotted = false;
        for (stackItem in Thread.currentThread().stackTrace) {
            if (stackItem.className == ResourceUtils::class.java.name) {

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Anatomy of Spring Boot Start Up Timing

When a Spring Boot app starts up with default (INFO) logging, there are some noticeable gaps (pauses). It's worth focusing on the gaps when looking for efficiency savings because of the amount of time they take, and because no-one bothered to log anything, so the chances are the app is doing something repetitive. We can tweak the logging levels to try and fill in the gaps and find out what is going on in there.

Basic empty web app with actuators has three such gaps:

0                                                                        1410ms
|------|---------------------------|-----|------|---------|--------|--------|
       |           578             |     |144(5)|         | 133(6) |

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#!/bin/bash

## Run this in a directory to fetch all Git repos within it.

find -name .git | sed 's#.git##' | sort | xargs -t -n1 -I %  git -C % fetch --all

## CRON job: You can also put this into `crontab -e` in order to keep all repos up-to-date automatically:
# # m h  DoM mth DoW   command
# */5 *  *   *   *     find /home/ondra/work -name .git | sed 's#.git##' | sort | xargs -t -n1 -I %  git -C % fetch --all --tags --force

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    private inline fun <reified T : OptionEnum> tryParseEnumOption(enumArgumentDefault: T, arg: String): T? {
        val optionIntro = "--${enumArgumentDefault.optionName}"

        if (!arg.startsWith(optionIntro))
            return null

        if (arg == optionIntro || arg == optionIntro + "=" + enumArgumentDefault.optionValue)
            return enumArgumentDefault

        val valueStr = arg.substringAfter(optionIntro).removePrefix("=")

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/*
  Lazy evaluation of the messages sent to Slf4j.
  Usage:  
    log.trace { "State dump: " + expensiveLongSerialisation(state) }
    See also https://jira.qos.ch/browse/SLF4J-371
*/

import org.slf4j.Logger
import org.slf4j.LoggerFactory
import kotlin.reflect.KClass