GH-846 - Fix module identifier lookup for jMolecules @Module(id = …).

We now properly translate jMolecules' @Module declaration configuring the id attribute explicitly into the identifier used for an application module.

Introduce @ApplicationModule(id = …) for Spring Modulith-native identifier customization.

spring-modulith-core/src/test/java/example/Example.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2024 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 example;
+
+/**
+ *
+ * @author Oliver Drotbohm
+ */
+public class Example {
+
+}

spring-modulith-core/src/test/java/example/jmolecules/package-info.java

@@ -1,2 +1,2 @@
-@org.jmolecules.ddd.annotation.Module
+@org.jmolecules.ddd.annotation.Module(id = "customId")
 package example.jmolecules;

spring-modulith-core/src/test/java/example/ni/nested/b/second/package-info.java

@@ -1,2 +1,2 @@
-@org.springframework.modulith.ApplicationModule
+@org.springframework.modulith.ApplicationModule(id = "secondCustomized")
 package example.ni.nested.b.second;

spring-modulith-core/src/test/java/org/springframework/modulith/core/ApplicationModuleSourceUnitTests.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2024 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.modulith.core;
+
+import static org.assertj.core.api.Assertions.*;
+
+import example.Example;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Unit tests for {@link ApplicationModuleSource}.
+ *
+ * @author Oliver Drotbohm
+ * @since 1.3
+ */
+class ApplicationModuleSourceUnitTests {
+
+	@Test // GH-846
+	void detectsSources() {
+
+		var rootPackage = TestUtils.getPackage(Example.class);
+		var detectionStrategy = ApplicationModuleDetectionStrategy.directSubPackage();
+
+		var sources = ApplicationModuleSource.from(rootPackage, detectionStrategy, false);
+
+		assertThat(sources)
+				.extracting(ApplicationModuleSource::getIdentifier)
+				.extracting(ApplicationModuleIdentifier::toString)
+				.contains("ninvalid", "customId", "invalid", "ni", "ni.nested.b.first", "secondCustomized", "ni.nested");
+	}
+}

spring-modulith-core/src/test/java/org/springframework/modulith/core/ApplicationModulesUnitTests.java

@@ -36,11 +36,11 @@ class ApplicationModulesUnitTests {
 				.extracting(Object::toString)
 				.containsExactlyInAnyOrder(
 						"invalid",
-						"jmolecules",
+						"customId",
 						"ni",
 						"ni.nested",
 						"ni.nested.b.first",
-						"ni.nested.b.second",
+						"secondCustomized",
 						"springbean");
 	}
 
@@ -63,7 +63,7 @@ class ApplicationModulesUnitTests {
 		assertThat(ni.getNestedModules(modules))
 				.extracting(ApplicationModule::getIdentifier)
 				.extracting(Object::toString)
-				.containsExactlyInAnyOrder("ni.nested", "ni.nested.b.first", "ni.nested.b.second");
+				.containsExactlyInAnyOrder("ni.nested", "ni.nested.b.first", "secondCustomized");
 	}
 
 	@Test // GH 578