Support Custom Maven Repository Locations

Closes gh-23

Author: rwinch

README.adoc

@@ -110,6 +110,19 @@ testImplementation ('org.springframework.experimental.boot:spring-boot-testjars:
 </dependency>
 ----
 
+==== Custom Maven Repositories
+
+By default, only Maven Central is searched.
+You can customize the repositories that are searched by injecting the repositories like the example below:
+
+[source,java]
+----
+List<RemoteRepository> repositories = new ArrayList<>();
+repositories.add(new RemoteRepository.Builder("central", "default", "https://repo.maven.apache.org/maven2/").build());
+repositories.add(new RemoteRepository.Builder("spring-milestone", "default", "https://repo.spring.io/milestone/").build());
+MavenClasspathEntry classpathEntry = new MavenClasspathEntry("org.springframework:spring-core:6.1.0-RC1", repositories);
+----
+
 === Default Java Main
 
 In some cases you need to provide a Java main class without any additional configuration.

spring-boot-testjars/src/main/java/org/springframework/experimental/boot/server/exec/MavenClasspathEntry.java

@@ -59,6 +59,8 @@ public class MavenClasspathEntry implements ClasspathEntry {
 
 	private final Log logger = LogFactory.getLog(getClass());
 
+	private final List<RemoteRepository> repositories;
+
 	/**
 	 * The maven coordinates (e.g. "org.springframework:spring-core:6.1.0")
 	 */
@@ -71,7 +73,27 @@ public class MavenClasspathEntry implements ClasspathEntry {
 	 * SpringBootVersion.getVersion()).
 	 */
 	public MavenClasspathEntry(String coords) {
+		this(coords, newRepositories());
+	}
+
+	/**
+	 * Creates a new instance.
+	 *
+	 * <code>
+	 *     List$lt;RemoteRepository&gt; repositories = new ArrayList&lt;&gt;();
+	 *     repositories.add(new RemoteRepository.Builder("central", "default", "https://repo.maven.apache.org/maven2/").build());
+	 *     repositories.add(new RemoteRepository.Builder("spring-milestone", "default", "https://repo.spring.io/milestone/").build());
+	 *     MavenClasspathEntry entry = new MavenClasspathEntry("org.springframework:spring-core:6.2.0-RC1", repositories);
+	 * </code>
+	 * @param coords the maven coordinates (e.g. *
+	 * "org.springframework.boot:spring-boot-starter-web:" + *
+	 * SpringBootVersion.getVersion()).
+	 * @param repositories a {@link List} of the {@link RemoteRepository} instances to
+	 * use.
+	 */
+	public MavenClasspathEntry(String coords, List<RemoteRepository> repositories) {
 		this.coords = coords;
+		this.repositories = repositories;
 	}
 
 	/**
@@ -105,7 +127,7 @@ public List<String> resolve() {
 
 		CollectRequest collectRequest = new CollectRequest();
 		collectRequest.setRoot(new Dependency(artifact, JavaScopes.COMPILE));
-		collectRequest.setRepositories(newRepositories(system, session));
+		collectRequest.setRepositories(this.repositories);
 
 		DependencyRequest dependencyRequest = new DependencyRequest(collectRequest, classpathFlter);
 
@@ -166,7 +188,7 @@ private static DefaultRepositorySystemSession newRepositorySystemSession(Reposit
 		return session;
 	}
 
-	private static List<RemoteRepository> newRepositories(RepositorySystem system, RepositorySystemSession session) {
+	private static List<RemoteRepository> newRepositories() {
 		return new ArrayList<>(Collections.singletonList(newCentralRepository()));
 	}
 

spring-boot-testjars/src/test/java/org/springframework/experimental/boot/server/exec/MavenClasspathEntryTests.java

@@ -17,9 +17,11 @@
 package org.springframework.experimental.boot.server.exec;
 
 import java.io.File;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 
+import org.eclipse.aether.repository.RemoteRepository;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.SpringBootVersion;
@@ -45,4 +47,26 @@ void springBootStarter() {
 				.isTrue();
 	}
 
+	@Test
+	void resolveDependencyWhenCustomRepository() {
+		List<RemoteRepository> repositories = new ArrayList<>();
+		repositories.add(
+				new RemoteRepository.Builder("central", "default", "https://repo.maven.apache.org/maven2/").build());
+		repositories
+				.add(new RemoteRepository.Builder("spring-milestone", "default", "https://repo.spring.io/milestone/")
+						.build());
+		MavenClasspathEntry classpathEntry = new MavenClasspathEntry("org.springframework:spring-core:6.1.0-RC1",
+				repositories);
+		List<String> entries = classpathEntry.resolve();
+		assertThat(entries).hasSize(2);
+		String mavenLocal = new File(System.getProperty("user.home"), ".m2/repository").getAbsolutePath();
+		entries.forEach((entry) -> assertThat(entry).startsWith(mavenLocal));
+		String springCorePathPartial = "/org/springframework/spring-core/6.1.0-RC1/spring-core-6.1.0-RC1.jar";
+		Optional<String> springCoreEntry = entries.stream().filter((entry) -> entry.contains(springCorePathPartial))
+				.findFirst();
+		assertThat(springCoreEntry.isPresent())
+				.withFailMessage("Unable to find spring-core with path that contains " + springCorePathPartial)
+				.isTrue();
+	}
+
 }