EJB und Services

<?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>27ejbservices-pair</artifactId>
                <version>1.0.0</version>
                <relativePath>../pom.xml</relativePath>
            </parent>
            <artifactId>service-rest-modern</artifactId>
            <packaging>jar</packaging>
            <name>Service REST Modern</name>

            <dependencies>
                <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

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

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
</plugin>

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

package at.aydin.lab.ejb.modern;

import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/orders")
public class OrderController {
    private final OrderService service;
    public OrderController(OrderService service) {
        this.service = service;
    }

    @PostMapping
    public String order(@RequestParam String sku, @RequestParam int quantity) {
        return service.placeOrder(sku, quantity);
    }
}

package at.aydin.lab.ejb.modern;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class OrderApplication {
    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }
}

package at.aydin.lab.ejb.modern;

import org.springframework.stereotype.Service;

// Design Pattern: Service Layer
// Zweck: Fachlogik ist containerleicht, lokal testbar und nicht an RemoteObject gebunden.
@Service
public class OrderService {
    public String placeOrder(String sku, int quantity) {
        if (quantity <= 0) throw new IllegalArgumentException("quantity");
        return "ORDERED " + quantity + " x " + sku;
    }
}

package at.aydin.lab.ejb.modern;

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

class OrderServiceTest {
    @Test
    void placesOrder() {
        assertEquals("ORDERED 2 x A", new OrderService().placeOrder("A", 2));
    }
}