soudmaijer

public class CallFoo {
  public static void main(String[] args) {
    Utils.foo();
  }
}

soudmaijer

public class Person {
    private final String name;
    private final int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {

soudmaijer

import brave.Tracer
import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation.Around
import org.aspectj.lang.annotation.Aspect
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.stereotype.Component

@Aspect
@Component
class TracingAspect {

soudmaijer

package nl.sourcelabs.kafka.producer

import org.slf4j.LoggerFactory
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.CommandLineRunner
import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.kafka.core.KafkaTemplate

@SpringBootApplication

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<project>
    <build>
        <plugins>
            <plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <id>compile</id>
                        <phase>process-sources</phase>

soudmaijer

<project>
    ...
    
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>9</source>

soudmaijer

import org.slf4j.LoggerFactory
import org.springframework.jdbc.core.JdbcTemplate
import org.springframework.stereotype.Component
import org.springframework.transaction.annotation.Propagation
import org.springframework.transaction.annotation.Transactional
import java.time.Duration

interface LockManager {
    fun <T> tryWithLock(key: Long, timeout: Duration, function: () -> T): T
}

soudmaijer

import kotlinx.coroutines.experimental.GlobalScope
import kotlinx.coroutines.experimental.async
import kotlinx.coroutines.experimental.runBlocking
import java.util.*

data class GiftCard(val id: Int, val code: String)

class GiftCardService {

    /**

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val orderOrElse: Order = orderById?.apply {
    // do stuff with order
} ?: Order() // orElse with default

val orderOrElseThrow: Order = orderById?.apply {
    // do stuff with order
} ?: throw RuntimeException("orElseThrow") // orElseThrow

val orderId: Long? = orderById?.let {
    // do stuff with order

soudmaijer

fun doStuffWithOrder(id: Long) {
    val orderById: Order? = orderRepository.findOrderById(id)

    orderById?.run {
        // do stuff with order
    }

    orderById.id // Compiler error: Only safe ?. or non-null asserted calls are allowed on a nullable receiver of type Order?
}