public Builder addSources(com.google.cloud.vmmigration.v1.Source value) {
      if (sourcesBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureSourcesIsMutable();
        sources_.add(value);
        onChanged();
      } else {
        sourcesBuilder_.addMessage(value);
      }
      return this;
    }
<pre>
Output only. The list of sources response.
</pre>

<code>
repeated .google.cloud.vmmigration.v1.Source sources = 1 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/ListSourcesResponse.java