public Builder setGroupId(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      groupId_ = value;
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Required. The group identifier.
</pre>

<code>string group_id = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@param value The groupId to set.
@return This builder for chaining.
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/CreateGroupRequest.java