private MemberMXBean validateMember(String member) throws Exception {
    ObjectName objectName = MBeanJMXAdapter.getMemberMBeanName(member);
    MemberMXBean bean = mapOfMembers.get(objectName);

    if (bean != null) {
      return bean;
    } else {
      throw new Exception(
          String.format("%s is an invalid member name or Id. Current members are %s", member,
              mapOfMembers.keySet()));
    }
  }
Requests the corresponding member to provide the basic JVM metrics which are listed in class
JVMMetrics to be sent to Managing node.

@param member name or id of the member
@return basic metrics related to the JVM of the member
geode-core/src/main/java/org/apache/geode/management/internal/beans/DistributedSystemBridge.java