Support for Jmx (and Integration) autoconfig in parent contexts

When there are parent contexts we already had a strategy for registering
the actuator endpoints, but not the regular JMX or Integration MBeans.
This chnage makes the autoconfigs for JMX aware of the parent context.

Also adds a sample with a parent context.

See gh-847

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfigurationTests.java

@@ -18,6 +18,7 @@ package org.springframework.boot.autoconfigure.integration;
 
 import org.junit.Test;
 import org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration;
+import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.integration.support.channel.HeaderChannelRegistry;
 
@@ -29,10 +30,18 @@ import static org.junit.Assert.assertNotNull;
  */
 public class IntegrationAutoConfigurationTests {
 
-	private final AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
+	private AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
 
 	@Test
 	public void integrationIsAvailable() {
+		this.context.register(IntegrationAutoConfiguration.class);
+		this.context.refresh();
+		assertNotNull(this.context.getBean(HeaderChannelRegistry.class));
+		this.context.close();
+	}
+
+	@Test
+	public void addJmxAuto() {
 		this.context.register(JmxAutoConfiguration.class,
 				IntegrationAutoConfiguration.class);
 		this.context.refresh();
@@ -40,4 +49,18 @@ public class IntegrationAutoConfigurationTests {
 		this.context.close();
 	}
 
+	@Test
+	public void parentContext() {
+		this.context.register(IntegrationAutoConfiguration.class);
+		this.context.refresh();
+		AnnotationConfigApplicationContext parent = this.context;
+		this.context = new AnnotationConfigApplicationContext();
+		this.context.setParent(parent);
+		this.context.register(IntegrationAutoConfiguration.class);
+		this.context.refresh();
+		assertNotNull(this.context.getBean(HeaderChannelRegistry.class));
+		((ConfigurableApplicationContext) this.context.getParent()).close();
+		this.context.close();
+	}
+
 }

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jmx/JmxAutoConfigurationTests.java

@@ -21,6 +21,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -51,6 +52,9 @@ public class JmxAutoConfigurationTests {
 	public void tearDown() {
 		if (this.context != null) {
 			this.context.close();
+			if (this.context.getParent() != null) {
+				((ConfigurableApplicationContext) this.context.getParent()).close();
+			}
 		}
 	}
 
@@ -104,6 +108,18 @@ public class JmxAutoConfigurationTests {
 				ReflectionTestUtils.getField(naming, "defaultDomain"));
 	}
 
+	@Test
+	public void testParentContext() {
+		this.context = new AnnotationConfigApplicationContext();
+		this.context.register(JmxAutoConfiguration.class);
+		this.context.refresh();
+		AnnotationConfigApplicationContext parent = this.context;
+		this.context = new AnnotationConfigApplicationContext();
+		this.context.setParent(parent);
+		this.context.register(JmxAutoConfiguration.class);
+		this.context.refresh();
+	}
+
 	@Configuration
 	public static class TestConfiguration {