public Builder setCustomClassId(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      customClassId_ = value;
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
If this custom class is a resource, the custom_class_id is the resource id
of the CustomClass. Case sensitive.
</pre>

<code>string custom_class_id = 2;</code>

@param value The customClassId to set.
@return This builder for chaining.
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/CustomClass.java