GH-106 - Avoid intercepting Object and proxy-related methods for module interaction tracing.

We now skip Object methods and ones declared on Spring's Advised or TargetClassAware types when intercepting invocations to trigger a module entry.

spring-modulith-observability/src/test/java/example/sample/SampleComponent.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2023 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.sample;
+
+import org.springframework.stereotype.Component;
+
+/**
+ * @author Oliver Drotbohm
+ */
+@Component
+public class SampleComponent {
+
+	void someMethod() {}
+}

spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ObservedModuleTypeUnitTests.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2023 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.observability;
+
+import static org.assertj.core.api.Assertions.*;
+
+import example.sample.SampleComponent;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.aop.framework.Advised;
+import org.springframework.modulith.model.ApplicationModule;
+import org.springframework.modulith.model.ApplicationModules;
+import org.springframework.modulith.model.ArchitecturallyEvidentType;
+import org.springframework.modulith.test.TestApplicationModules;
+import org.springframework.util.ReflectionUtils;
+
+/**
+ * Unit tests for {@link ObservedModuleType}.
+ *
+ * @author Oliver Drotbohm
+ */
+public class ObservedModuleTypeUnitTests {
+
+	static final ApplicationModules modules = TestApplicationModules.of("example");
+
+	ApplicationModule module = modules.getModuleByName("sample").orElseThrow();
+	ArchitecturallyEvidentType type = module.getArchitecturallyEvidentType(SampleComponent.class);
+
+	ObservedModuleType observedType = new ObservedModuleType(modules, new DefaultObservedModule(module), type);
+
+	@Test // GH-106
+	void onlyExposesUserMethodsAsToBeIntercepted() {
+
+		assertThat(observedType.getMethodsToIntercept()).satisfies(it -> {
+
+			assertThat(it.test(ReflectionUtils.findMethod(SampleComponent.class, "someMethod"))).isTrue();
+
+			assertThat(it.test(ReflectionUtils.findMethod(Object.class, "toString"))).isFalse();
+			assertThat(it.test(ReflectionUtils.findMethod(Advised.class, "getTargetClass"))).isFalse();
+		});
+	}
+
+	@Test // GH-106
+	void considersExposedTypeAsToBeIntercepted() {
+		assertThat(observedType.shouldBeTraced()).isTrue();
+	}
+}