protected SystemMember createSystemMember(ApplicationVM app)
      throws org.apache.geode.admin.AdminException {
    return new SystemMemberImpl(this, app);
  }
Override createSystemMember by instantiating SystemMemberImpl

@throws AdminException TODO-javadocs
geode-core/src/main/java/org/apache/geode/admin/internal/AdminDistributedSystemImpl.java