Default endpoints.jmx.domain to the spring.jmx.default_domain

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

@@ -18,6 +18,7 @@ package org.springframework.boot.actuate.autoconfigure;
 
 import java.util.Properties;
 
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.util.StringUtils;
 
@@ -29,6 +30,7 @@ import org.springframework.util.StringUtils;
 @ConfigurationProperties(prefix = "endpoints.jmx")
 public class EndpointMBeanExportProperties {
 
+	@Value("${spring.jmx.default_domain:}")
 	private String domain;
 
 	private boolean uniqueNames = false;