GH-17 - Switch to Java 11 for the examples.

Tweak build to only include the examples module when running on JDK 11. Tweaked CI build to build everything but the examples on JDK 8 followed by a JDK 11 based build of the sample.

.github/workflows/build.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-
+    name: Build project
     runs-on: ubuntu-latest
 
     steps:
@@ -29,3 +29,26 @@ jobs:
 
     - name: Build with Maven
       run: mvn -B package --file pom.xml
+
+  build-examples:
+    name: Build examples
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - uses: actions/checkout@v2
+
+    - name: Set up JDK 8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 8
+
+    - uses: actions/cache@v1
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
+
+    - name: Build with Maven
+      run: mvn -B package --file jmolecules-examples/pom.xml

jmolecules-examples/jmolecules-spring-data-jpa/src/main/java/org/jmolecules/examples/jpa/Application.java

@@ -15,6 +15,7 @@
  */
 package org.jmolecules.examples.jpa;
 
+import org.jmolecules.examples.jpa.customer.Address;
 import org.jmolecules.examples.jpa.customer.Customer;
 import org.jmolecules.examples.jpa.customer.Customers;
 import org.jmolecules.examples.jpa.order.Order;
@@ -33,11 +34,13 @@ public static void main(String[] args) {
 
 		ApplicationContext context = SpringApplication.run(Application.class, args);
 
-		Customers customers = context.getBean(Customers.class);
-		Customer customer = customers.save(new Customer("Dave", "Matthews"));
+		var address = new Address("41 Greystreet", "Dreaming Tree", "2731");
 
-		Orders orders = context.getBean(Orders.class);
-		Order order = orders.save(new Order(customer));
+		var customers = context.getBean(Customers.class);
+		var customer = customers.save(new Customer("Dave", "Matthews", address));
+
+		var orders = context.getBean(Orders.class);
+		var order = orders.save(new Order(customer));
 
 		customers.resolveRequired(order.getCustomer());
 	}

jmolecules-examples/jmolecules-spring-data-jpa/src/main/java/org/jmolecules/examples/jpa/customer/Address.java

@@ -27,6 +27,15 @@
 public class Address implements Entity<Customer, Address.AddressId> {
 
 	private Address.AddressId id;
+	private final String street, city, zipCode;
+
+	public Address(String street, String city, String zipCode) {
+
+		this.id = AddressId.of(UUID.randomUUID());
+		this.street = street;
+		this.city = city;
+		this.zipCode = zipCode;
+	}
 
 	@Value(staticConstructor = "of")
 	public static class AddressId implements Identifier {

jmolecules-examples/jmolecules-spring-data-jpa/src/main/java/org/jmolecules/examples/jpa/customer/Customer.java

@@ -16,16 +16,17 @@
 package org.jmolecules.examples.jpa.customer;
 
 import lombok.Getter;
-import lombok.RequiredArgsConstructor;
 import lombok.Value;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
 
 import org.jmolecules.ddd.types.AggregateRoot;
 import org.jmolecules.ddd.types.Association;
 import org.jmolecules.ddd.types.Identifier;
 import org.jmolecules.examples.jpa.customer.Customer.CustomerId;
+import org.springframework.util.Assert;
 
 /**
  * @author Oliver Drotbohm
@@ -37,15 +38,20 @@ public class Customer implements AggregateRoot<Customer, CustomerId> {
 	private String firstname, lastname;
 	private List<Address> addresses;
 
-	public Customer(String firstname, String lastname) {
+	public Customer(String firstname, String lastname, Address address) {
+
+		Assert.notNull(address, "Address must not be null!");
 
 		this.id = CustomerId.of(UUID.randomUUID());
+
 		this.firstname = firstname;
 		this.lastname = lastname;
+
+		this.addresses = new ArrayList<>();
+		this.addresses.add(address);
 	}
 
-	@Value
-	@RequiredArgsConstructor(staticName = "of")
+	@Value(staticConstructor = "of")
 	public static class CustomerId implements Identifier {
 		private final UUID id;
 	}

jmolecules-examples/pom.xml

@@ -1,4 +1,6 @@
-<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">
+<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>
@@ -15,4 +17,18 @@
 		<module>jmolecules-spring-data-jpa</module>
 	</modules>
 
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.1</version>
+				<configuration>
+					<source>11</source>
+					<target>11</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
 </project>

pom.xml

@@ -49,10 +49,18 @@
 				<activeByDefault>true</activeByDefault>
 			</activation>
 			<modules>
-				<module>jmolecules-examples</module>
 				<module>jmolecules-bytebuddy-empty</module>
 			</modules>
 		</profile>
+		<profile>
+			<id>java-11</id>
+			<activation>
+				<jdk>11</jdk>
+			</activation>
+			<modules>
+				<module>jmolecules-examples</module>
+			</modules>
+		</profile>
 		<profile>
 			<id>sonatype</id>
 			<properties>