Add interface-based detection test

Add a test that explicitely validates that `@ManagedResource` and friends
can be set on an interface.

Issue: SPR-13138
(cherry picked from commit eb49f3c)

spring-context/src/test/java/org/springframework/jmx/export/annotation/AnotherAnnotationTestBean.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2002-2016 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
+ *
+ *      http://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.jmx.export.annotation;
+
+import org.springframework.jmx.support.MetricType;
+
+/**
+ * @author Stephane Nicoll
+ */
+@ManagedResource(objectName = "bean:name=interfaceTestBean", description = "My Managed Bean")
+public interface AnotherAnnotationTestBean {
+
+	@ManagedOperation(description = "invoke foo")
+	void foo();
+
+	@ManagedAttribute(description = "Bar description")
+	String getBar();
+
+	void setBar(String bar);
+
+	@ManagedMetric(description = "a metric", metricType = MetricType.COUNTER)
+	int getCacheEntries();
+
+}

spring-context/src/test/java/org/springframework/jmx/export/annotation/AnotherAnnotationTestBeanImpl.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2002-2016 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
+ *
+ *      http://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.jmx.export.annotation;
+
+/**
+ * @author Stephane Nicoll
+ */
+class AnotherAnnotationTestBeanImpl implements AnotherAnnotationTestBean {
+
+	private String bar;
+
+	@Override
+	public void foo() {
+	}
+
+	public void doNotExpose() {
+
+	}
+
+	@Override
+	public String getBar() {
+		return this.bar;
+	}
+
+	@Override
+	public void setBar(String bar) {
+		this.bar = bar;
+	}
+
+	@Override
+	public int getCacheEntries() {
+		return 42;
+	}
+
+}

spring-context/src/test/resources/org/springframework/jmx/export/annotation/annotations.xml

@@ -20,26 +20,22 @@
 	</bean>
 
 	<bean id="testBean" class="org.springframework.jmx.export.annotation.AnnotationTestSubBean">
-		<property name="name">
-			<value>TEST</value>
-		</property>
-		<property name="age">
-			<value>100</value>
-		</property>
+		<property name="name" value="TEST"/>
+		<property name="age" value="100"/>
+	</bean>
+
+	<bean id="testInterfaceBean" class="org.springframework.jmx.export.annotation.AnotherAnnotationTestBeanImpl">
+		<property name="bar" value="Init value"/>
 	</bean>
 
 	<bean id="attributeSource" class="org.springframework.jmx.export.annotation.AnnotationJmxAttributeSource"/>
 
 	<bean id="metadataNamingStrategy" class="org.springframework.jmx.export.naming.MetadataNamingStrategy">
-		<property name="attributeSource">
-			<ref bean="attributeSource"/>
-		</property>
+		<property name="attributeSource" ref="attributeSource"/>
 	</bean>
 
 	<bean id="metadataAssembler" class="org.springframework.jmx.export.assembler.MetadataMBeanInfoAssembler">
-		<property name="attributeSource">
-			<ref bean="attributeSource"/>
-		</property>
+		<property name="attributeSource" ref="attributeSource"/>
 	</bean>
 
 </beans>