Add MBeanServer @Bean in case it is needed

Anywhere that an MBeanServer is needed it should be
created @Conditionally, so that user can exclude the
JmxAutoConfiguration and still get the other JMX
behaviours automatically.

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/EndpointMBeanExportAutoConfiguration.java

@@ -24,10 +24,12 @@ import org.springframework.boot.actuate.endpoint.jmx.EndpointMBeanExporter;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.jmx.support.MBeanServerFactoryBean;
 import org.springframework.util.StringUtils;
 
 /**
@@ -61,4 +63,11 @@ public class EndpointMBeanExportAutoConfiguration {
 		return mbeanExporter;
 	}
 
+	@Bean
+	@ConditionalOnMissingBean(MBeanServer.class)
+	public MBeanServerFactoryBean mbeanServer() {
+		MBeanServerFactoryBean factory = new MBeanServerFactoryBean();
+		factory.setLocateExistingServerIfPossible(true);
+		return factory;
+	}
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfiguration.java

@@ -16,15 +16,19 @@
 
 package org.springframework.boot.autoconfigure.integration;
 
+import javax.management.MBeanServer;
+
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.integration.config.EnableIntegration;
 import org.springframework.integration.jmx.config.EnableIntegrationMBeanExport;
 import org.springframework.integration.jmx.config.IntegrationMBeanExportConfiguration;
+import org.springframework.jmx.support.MBeanServerFactoryBean;
 
 /**
  * {@link org.springframework.boot.autoconfigure.EnableAutoConfiguration
@@ -52,4 +56,12 @@ public class IntegrationAutoConfiguration {
 	protected static class IntegrationJmxConfiguration {
 	}
 
+	@Bean
+	@ConditionalOnMissingBean(MBeanServer.class)
+	public MBeanServerFactoryBean mbeanServer() {
+		MBeanServerFactoryBean factory = new MBeanServerFactoryBean();
+		factory.setLocateExistingServerIfPossible(true);
+		return factory;
+	}
+
 }