GH-522 - Support for package info types.

Introduce @PackageInfo annotation to allow marking a types as alternative to Java's native package-info.java so that annotation lookups on a JavaPackage will also find annotations placed on that type. Useful to declare package scoped metadata like @ApplicationModule and @NamedInterface for languages that do not support packages well enough (read: Kotlin).

spring-modulith-integration-test/src/main/java/pkg/multipleontype/MarkerOne.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 pkg.multipleontype;
+
+import org.springframework.modulith.ApplicationModule;
+
+/**
+ * @author Oliver Drotbohm
+ */
+@ApplicationModule
+class MarkerOne {}

spring-modulith-integration-test/src/main/java/pkg/multipleontype/MarkerTwo.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 pkg.multipleontype;
+
+import org.springframework.modulith.ApplicationModule;
+
+/**
+ * @author Oliver Drotbohm
+ */
+@ApplicationModule
+class MarkerTwo {}

spring-modulith-integration-test/src/main/java/pkg/onpackage/package-info.java

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+@org.springframework.modulith.ApplicationModule(displayName = "onPackage")
+package pkg.onpackage;

spring-modulith-integration-test/src/main/java/pkg/ontype/Marker.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 pkg.ontype;
+
+import org.springframework.modulith.ApplicationModule;
+
+/**
+ * @author Oliver Drotbohm
+ */
+@ApplicationModule(displayName = "onType")
+public class Marker {}

spring-modulith-integration-test/src/main/java/pkg/ontype/nested/Marker.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 pkg.ontype.nested;
+
+import org.springframework.modulith.ApplicationModule;
+
+/**
+ * @author Oliver Drotbohm
+ */
+@ApplicationModule(displayName = "onTypeNested")
+public class Marker {}