public Builder setAppId(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      appId_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
Required. The App ID is supplied as an HTTP parameter. Unlike internal
usage of App ID, it does not include a region prefix. Rather, the App ID
represents the Project ID against which to make the request.
</pre>

<code>string app_id = 1 [(.google.api.field_behavior) = REQUIRED];</code>

@param value The appId to set.
@return This builder for chaining.
java-tasks/proto-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/UploadQueueYamlRequest.java