code: public UpdateUserRequest withGroups(String... groups) {
          if (this.groups == null) {
              setGroups(new java.util.ArrayList<String>(groups.length));
          }
          for (String ele : groups) {
              this.groups.add(ele);
          }
          return this;
      }
docs: The list of groups (20 maximum) to which the ActiveMQ user belongs. This value can contain only alphanumeric
  characters, dashes, periods, underscores, and tildes (- . _ ~). This value must be 2-100 characters long.
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setGroups(java.util.Collection)} or {@link #withGroups(java.util.Collection)} if you want to override the
  existing values.
  </p>
  
  @param groups
  The list of groups (20 maximum) to which the ActiveMQ user belongs. This value can contain only
  alphanumeric characters, dashes, periods, underscores, and tildes (- . _ ~). This value must be 2-100
  characters long.
  @return Returns a reference to this object so that method calls can be chained together.