Prevent duplicate JmxEndpoint MBean registration

Update JmxEndpoint support so that the `@ManagedResource` annotation
is no longer required. This prevents both `EndpointMBeanExporter` and
the regular `AnnotationMBeanExporter` from both registering the bean.

Fixes gh-7813
See gh-6579

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/AbstractJmxEndpoint.java

@@ -22,7 +22,6 @@ import org.springframework.boot.actuate.endpoint.Endpoint;
 import org.springframework.boot.actuate.endpoint.EndpointProperties;
 import org.springframework.context.EnvironmentAware;
 import org.springframework.core.env.Environment;
-import org.springframework.jmx.export.annotation.ManagedResource;
 import org.springframework.util.ObjectUtils;
 
 /**
@@ -33,7 +32,6 @@ import org.springframework.util.ObjectUtils;
  * @author Phillip Webb
  * @since 1.5.0
  */
-@ManagedResource
 public abstract class AbstractJmxEndpoint implements JmxEndpoint, EnvironmentAware {
 
 	private final DataConverter dataConverter;

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/AuditEventsJmxEndpoint.java

@@ -28,6 +28,7 @@ import org.springframework.boot.actuate.audit.AuditEventRepository;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.jmx.export.annotation.ManagedOperation;
 import org.springframework.util.Assert;
+import org.springframework.util.StringUtils;
 
 /**
  * {@link JmxEndpoint} for {@link AuditEventRepository}.
@@ -72,8 +73,11 @@ public class AuditEventsJmxEndpoint extends AbstractJmxEndpoint {
 
 	private Date parseDate(String date) {
 		try {
+			if (StringUtils.hasLength(date)) {
 				return new SimpleDateFormat(DATE_FORMAT).parse(date);
 			}
+			return null;
+		}
 		catch (ParseException ex) {
 			throw new IllegalArgumentException(ex);
 		}

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/DataEndpointMBean.java

@@ -20,7 +20,6 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 
 import org.springframework.boot.actuate.endpoint.Endpoint;
 import org.springframework.jmx.export.annotation.ManagedAttribute;
-import org.springframework.jmx.export.annotation.ManagedResource;
 
 /**
  * Simple wrapper around {@link Endpoint} implementations that provide actuator data of
@@ -29,7 +28,6 @@ import org.springframework.jmx.export.annotation.ManagedResource;
  * @author Christian Dupuis
  * @author Andy Wilkinson
  */
-@ManagedResource
 public class DataEndpointMBean extends EndpointMBean {
 
 	/**

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/EndpointMBean.java

@@ -20,7 +20,6 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 
 import org.springframework.boot.actuate.endpoint.Endpoint;
 import org.springframework.jmx.export.annotation.ManagedAttribute;
-import org.springframework.jmx.export.annotation.ManagedResource;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.ObjectUtils;
@@ -35,7 +34,6 @@ import org.springframework.util.ObjectUtils;
  * @see JmxEndpoint
  * @see DataEndpointMBean
  */
-@ManagedResource
 public abstract class EndpointMBean implements JmxEndpoint {
 
 	private final DataConverter dataConverter;

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/EndpointMBeanExporter.java

@@ -46,9 +46,12 @@ import org.springframework.jmx.export.MBeanExporter;
 import org.springframework.jmx.export.annotation.AnnotationJmxAttributeSource;
 import org.springframework.jmx.export.annotation.ManagedResource;
 import org.springframework.jmx.export.assembler.MetadataMBeanInfoAssembler;
+import org.springframework.jmx.export.metadata.InvalidMetadataException;
+import org.springframework.jmx.export.metadata.JmxAttributeSource;
 import org.springframework.jmx.export.naming.MetadataNamingStrategy;
 import org.springframework.jmx.export.naming.SelfNaming;
 import org.springframework.jmx.support.ObjectNameManager;
+import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 
 /**
@@ -70,7 +73,7 @@ public class EndpointMBeanExporter extends MBeanExporter
 
 	private static final Log logger = LogFactory.getLog(EndpointMBeanExporter.class);
 
-	private final AnnotationJmxAttributeSource attributeSource = new AnnotationJmxAttributeSource();
+	private final AnnotationJmxAttributeSource attributeSource = new EndpointJmxAttributeSource();
 
 	private final MetadataMBeanInfoAssembler assembler = new MetadataMBeanInfoAssembler(
 			this.attributeSource);
@@ -253,8 +256,8 @@ public class EndpointMBeanExporter extends MBeanExporter
 		if (bean instanceof SelfNaming) {
 			return ((SelfNaming) bean).getObjectName();
 		}
-		if (bean instanceof EndpointMBean) {
+		if (bean instanceof JmxEndpoint) {
-			return getObjectName((EndpointMBean) bean, beanKey);
+			return getObjectName((JmxEndpoint) bean, beanKey);
 		}
 		return this.defaultNamingStrategy.getObjectName(bean, beanKey);
 	}
@@ -363,4 +366,19 @@ public class EndpointMBeanExporter extends MBeanExporter
 		}
 	}
 
+	/**
+	 * {@link JmxAttributeSource} for {@link JmxEndpoint JmxEndpoints}.
+	 */
+	private static class EndpointJmxAttributeSource extends AnnotationJmxAttributeSource {
+
+		@Override
+		public org.springframework.jmx.export.metadata.ManagedResource getManagedResource(
+				Class<?> beanClass) throws InvalidMetadataException {
+			Assert.state(super.getManagedResource(beanClass) == null,
+					"@ManagedResource annotation found on JmxEndpoint " + beanClass);
+			return new org.springframework.jmx.export.metadata.ManagedResource();
+		}
+
+	}
+
 }

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/JmxEndpoint.java

@@ -17,11 +17,13 @@
 package org.springframework.boot.actuate.endpoint.jmx;
 
 import org.springframework.boot.actuate.endpoint.Endpoint;
+import org.springframework.jmx.export.annotation.ManagedResource;
 
 /**
  * A strategy for the JMX layer on top of an {@link Endpoint}. Implementations are allowed
- * to use {@code @ManagedAttribute} and the full Spring JMX machinery. Implementations may
+ * to use {@code @ManagedAttribute} and the full Spring JMX machinery but should not use
- * be backed by an actual {@link Endpoint} or may be specifically designed for JMX only.
+ * the {@link ManagedResource @ManagedResource} annotation. Implementations may be backed
+ * by an actual {@link Endpoint} or may be specifically designed for JMX only.
  *
  * @author Phillip Webb
  * @since 1.5.0

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/LoggersEndpointMBean.java

@@ -24,7 +24,6 @@ import org.springframework.boot.actuate.endpoint.mvc.MvcEndpoint;
 import org.springframework.boot.logging.LogLevel;
 import org.springframework.jmx.export.annotation.ManagedAttribute;
 import org.springframework.jmx.export.annotation.ManagedOperation;
-import org.springframework.jmx.export.annotation.ManagedResource;
 import org.springframework.util.Assert;
 
 /**
@@ -33,7 +32,6 @@ import org.springframework.util.Assert;
  * @author Vedran Pavic
  * @since 1.5.0
  */
-@ManagedResource
 public class LoggersEndpointMBean extends EndpointMBean {
 
 	public LoggersEndpointMBean(String beanName, Endpoint<?> endpoint,

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/ShutdownEndpointMBean.java

@@ -21,7 +21,6 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import org.springframework.boot.actuate.endpoint.Endpoint;
 import org.springframework.boot.actuate.endpoint.ShutdownEndpoint;
 import org.springframework.jmx.export.annotation.ManagedOperation;
-import org.springframework.jmx.export.annotation.ManagedResource;
 
 /**
  * Special endpoint wrapper for {@link ShutdownEndpoint}.
@@ -29,7 +28,6 @@ import org.springframework.jmx.export.annotation.ManagedResource;
  * @author Christian Dupuis
  * @author Andy Wilkinson
  */
-@ManagedResource
 public class ShutdownEndpointMBean extends EndpointMBean {
 
 	/**