Mark bootArchives configuration as unresolvable

See gh-22943

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/plugin/SpringBootPlugin.java

@@ -111,6 +111,7 @@ public class SpringBootPlugin implements Plugin<Project> {
 	private Configuration createBootArchivesConfiguration(Project project) {
 		Configuration bootArchives = project.getConfigurations().create(BOOT_ARCHIVES_CONFIGURATION_NAME);
 		bootArchives.setDescription("Configuration for Spring Boot archive artifacts.");
+		bootArchives.setCanBeResolved(false);
 		return bootArchives;
 	}
 

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/plugin/BootArchivesConfigurationContractTests.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.gradle.plugin;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.gradle.api.Project;
+import org.gradle.api.artifacts.Configuration;
+import org.gradle.testfixtures.ProjectBuilder;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for expectations about {code bootArchives} Gradle configuration about its
+ * purpose.
+ *
+ * @author Martin Chalupa
+ */
+public class BootArchivesConfigurationContractTests {
+
+	@TempDir
+	File temp;
+
+	private Project project;
+
+	@BeforeEach
+	void createConvention() throws IOException {
+		this.project = ProjectBuilder.builder().withProjectDir(this.temp).build();
+	}
+
+	@Test
+	void bootArchivesConfigurationsCannotBeResolved() {
+		this.project.getPlugins().apply(SpringBootPlugin.class);
+		Configuration bootArchives = this.project.getConfigurations()
+				.getByName(SpringBootPlugin.BOOT_ARCHIVES_CONFIGURATION_NAME);
+		assertThat(bootArchives.isCanBeResolved()).isFalse();
+	}
+
+}