Add workaround for annotationProcessor scope detection in IJ

Closes gh-848

initializr-generator-spring/src/main/java/io/spring/initializr/generator/spring/build/gradle/GradleConfigurationBuildCustomizer.java

@@ -39,6 +39,13 @@ public class GradleConfigurationBuildCustomizer implements BuildCustomizer<Gradl
 		if (providedRuntimeUsed && !war) {
 			build.addConfiguration("providedRuntime");
 		}
+		boolean annotationProcessorUsed = build.dependencies().items()
+				.anyMatch((dependency) -> dependency
+						.getScope() == DependencyScope.ANNOTATION_PROCESSOR);
+		if (annotationProcessorUsed) {
+			build.customizeConfiguration("compileOnly",
+					(configuration) -> configuration.extendsFrom("annotationProcessor"));
+		}
 	}
 
 	@Override

initializr-generator-spring/src/test/java/io/spring/initializr/generator/spring/build/gradle/GradleConfigurationBuildCustomizerTests.java

@@ -65,6 +65,30 @@ class GradleConfigurationBuildCustomizerTests {
 		assertThat(build.getConfigurationCustomizations()).isEmpty();
 	}
 
+	@Test
+	void compileOnlyConfigurationIsAddedWithAnnotationProcessorDependency() {
+		GradleBuild build = new GradleBuild();
+		build.dependencies().add("lib", "com.example", "lib", DependencyScope.COMPILE);
+		build.dependencies().add("ap", "com.example", "model-generator",
+				DependencyScope.ANNOTATION_PROCESSOR);
+		customize(build);
+		assertThat(build.getConfigurationCustomizations())
+				.containsOnlyKeys("compileOnly");
+		ConfigurationCustomization compileOnly = build.getConfigurationCustomizations()
+				.get("compileOnly");
+		assertThat(compileOnly.getExtendsFrom()).containsOnly("annotationProcessor");
+	}
+
+	@Test
+	void compileOnlyConfigurationIsNotAddedWithNonMatchingDependency() {
+		GradleBuild build = new GradleBuild();
+		build.dependencies().add("lib", "com.example", "lib", DependencyScope.COMPILE);
+		build.dependencies().add("another", "com.example", "another",
+				DependencyScope.RUNTIME);
+		customize(build);
+		assertThat(build.getConfigurationCustomizations()).isEmpty();
+	}
+
 	private void customize(GradleBuild build) {
 		new GradleConfigurationBuildCustomizer().customize(build);
 	}

initializr-generator-spring/src/test/resources/project/gradle/annotation-processor-dependency-build.gradle.gen

@@ -9,6 +9,12 @@ group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = '1.8'
 
+configurations {
+	compileOnly {
+		extendsFrom annotationProcessor
+	}
+}
+
 repositories {
 	mavenCentral()
 }