GH-47 - Treat efferent dependencies of configuration properties classes as simple dependencies.

spring-modulith-core/src/main/java/org/springframework/modulith/model/ApplicationModule.java

@@ -398,7 +398,10 @@ public class ApplicationModule {
 
 	private Stream<ApplicationModule> getDirectModuleBootstrapDependencies(ApplicationModules modules) {
 
-		return getSpringBeansInternal().stream() //
+		var beans = getSpringBeansInternal();
+
+		return beans.stream() //
+				.map(it -> ArchitecturallyEvidentType.of(it, beans)) //
 				.flatMap(it -> ModuleDependency.fromType(it)) //
 				.filter(it -> isDependencyToOtherModule(it.target, modules)) //
 				.filter(it -> it.hasType(DependencyType.USES_COMPONENT)) //
@@ -409,10 +412,12 @@ public class ApplicationModule {
 
 	private Stream<ModuleDependency> getModuleDependenciesOf(JavaClass type, ApplicationModules modules) {
 
-		Stream<ModuleDependency> injections = ModuleDependency.fromType(type) //
+		var evidentType = ArchitecturallyEvidentType.of(type, getSpringBeansInternal());
+
+		var injections = ModuleDependency.fromType(evidentType) //
 				.filter(it -> isDependencyToOtherModule(it.getTarget(), modules)); //
 
-		Stream<ModuleDependency> directDependencies = type.getDirectDependenciesFromSelf().stream() //
+		var directDependencies = type.getDirectDependenciesFromSelf().stream() //
 				.filter(it -> isDependencyToOtherModule(it.getTargetClass(), modules)) //
 				.map(ModuleDependency::new);
 
@@ -649,18 +654,27 @@ public class ApplicationModule {
 					DependencyType.DEFAULT);
 		}
 
-		static Stream<ModuleDependency> fromType(JavaClass source) {
-			return Stream.concat(Stream.concat(fromConstructorOf(source), fromMethodsOf(source)), fromFieldsOf(source));
+		static Stream<ModuleDependency> fromType(ArchitecturallyEvidentType type) {
+
+			JavaClass source = type.getType();
+
+			return Stream.concat(Stream.concat(fromConstructorOf(type), fromMethodsOf(source)), fromFieldsOf(source));
 		}
 
-		private static Stream<ModuleDependency> fromConstructorOf(JavaClass source) {
+		private static Stream<ModuleDependency> fromConstructorOf(ArchitecturallyEvidentType source) {
 
-			Set<JavaConstructor> constructors = source.getConstructors();
+			JavaClass type = source.getType();
+			Set<JavaConstructor> constructors = type.getConstructors();
 
 			return constructors.stream() //
 					.filter(it -> constructors.size() == 1 || isInjectionPoint(it)) //
 					.flatMap(it -> it.getRawParameterTypes().stream() //
-							.map(parameter -> new InjectionModuleDependency(source, parameter, it)));
+							.map(parameter -> {
+								return source.isConfigurationProperties()
+										? new ModuleDependency(type, parameter, createDescription(it, parameter, "parameter"),
+												DependencyType.DEFAULT)
+										: new InjectionModuleDependency(type, parameter, it);
+							}));
 		}
 
 		private static Stream<ModuleDependency> fromFieldsOf(JavaClass source) {

spring-modulith-core/src/main/java/org/springframework/modulith/model/Classes.java

@@ -48,7 +48,9 @@ import com.tngtech.archunit.core.domain.properties.HasName;
  */
 @ToString
 @EqualsAndHashCode
-public class Classes implements DescribedIterable<JavaClass> {
+class Classes implements DescribedIterable<JavaClass> {
+
+	public static Classes NONE = Classes.of(Collections.emptyList());
 
 	private final List<JavaClass> classes;
 

spring-modulith-core/src/test/java/org/springframework/modulith/model/ModuleDependencyUnitTest.java

@@ -58,7 +58,10 @@ class ModuleDependencyUnitTest {
 
 	private Stream<Class<?>> findDependencies(Class<?> type) {
 
-		return ModuleDependency.fromType(importer.importClass(type)) //
+		var imported = importer.importClass(type);
+		var evidentType = ArchitecturallyEvidentType.of(imported, Classes.NONE);
+
+		return ModuleDependency.fromType(evidentType) //
 				.map(ModuleDependency::getTarget) //
 				.map(JavaClass::reflect);
 	}

spring-modulith-integration-test/src/main/java/com/acme/myproject/moduleC/SomeValueC.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2022 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 com.acme.myproject.moduleC;
+
+/**
+ * @author Oliver Drotbohm
+ */
+public class SomeValueC {}

spring-modulith-integration-test/src/main/java/com/acme/myproject/moduleD/ConfigurationPropertiesD.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2022 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 com.acme.myproject.moduleD;
+
+import lombok.RequiredArgsConstructor;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import com.acme.myproject.moduleC.SomeValueC;
+
+/**
+ * @author Oliver Drotbohm
+ */
+@ConfigurationProperties
+@RequiredArgsConstructor
+class ConfigurationPropertiesD {
+
+	private final SomeValueC value;
+}

spring-modulith-integration-test/src/test/java/com/acme/myproject/ModulithTest.java

@@ -19,6 +19,7 @@ import static org.assertj.core.api.Assertions.*;
 
 import org.junit.jupiter.api.Test;
 import org.springframework.modulith.model.ApplicationModule;
+import org.springframework.modulith.model.ApplicationModule.DependencyType;
 import org.springframework.modulith.model.ApplicationModules;
 import org.springframework.modulith.model.ApplicationModules.Filters;
 import org.springframework.modulith.model.Violations;
@@ -84,4 +85,20 @@ class ModulithTest {
 					.doesNotContain("moduleA");
 		});
 	}
+
+	@Test // GH-47
+	void configrationPropertiesTypesEstablishSimpleDependency() {
+
+		var modules = ApplicationModules.of(Application.class, DEFAULT_EXCLUSIONS);
+
+		assertThat(modules.getModuleByName("moduleD")).hasValueSatisfying(it -> {
+
+			assertThat(it.getDependencies(modules, DependencyType.DEFAULT))
+					.map(ApplicationModule::getName)
+					.contains("moduleC"); // ConfigurationProperties -> Value
+
+			assertThat(it.getDependencies(modules, DependencyType.USES_COMPONENT))
+					.isEmpty();
+		});
+	}
 }