Exception Handling und Logging

<?xml version="1.0" encoding="UTF-8"?>
        <project xmlns="http://maven.apache.org/POM/4.0.0"
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
            <modelVersion>4.0.0</modelVersion>
            <parent>
                <groupId>at.aydin.academy</groupId>
                <artifactId>18exceptionlogging-pair</artifactId>
                <version>1.0.0</version>
                <relativePath>../pom.xml</relativePath>
            </parent>
            <artifactId>exception-logging-modern</artifactId>
            <packaging>jar</packaging>
            <name>Exception Logging Modern</name>

            <dependencies>

<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter</artifactId>
    <scope>test</scope>
</dependency>

            </dependencies>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-compiler-plugin</artifactId>
                    </plugin>

                </plugins>
            </build>
        </project>

package at.aydin.lab.errors.modern;

import java.util.*;

// Design Pattern: Exception Translator
// Zweck: Technische Abwesenheit wird in eine eindeutige fachliche Exception übersetzt.
public final class CustomerLookupService {
    private static final System.Logger LOG = System.getLogger(CustomerLookupService.class.getName());
    private final Map<Long, String> data = Map.of(1L, "Aydin");
    public String find(long id) {
        return Optional.ofNullable(data.get(id)).map(String::toUpperCase).orElseThrow(() -> {
            LOG.log(System.Logger.Level.WARNING, "customerId={0} not found", id); return new CustomerNotFoundException(id);
            });
    }
}

package at.aydin.lab.errors.modern;

public final class CustomerNotFoundException extends RuntimeException {
    public CustomerNotFoundException(long id) {
        super("Kunde nicht gefunden: " + id);
    }
}

package at.aydin.lab.errors.modern;

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

class CustomerLookupServiceTest {
    @Test
    void throwsDomainException() {
        assertEquals("AYDIN", new CustomerLookupService().find(1));
        assertThrows(CustomerNotFoundException.class, () -> new CustomerLookupService().find(99));
    }
}