private com.google.protobuf.SingleFieldBuilderV3<
            com.google.webrisk.v1.Submission,
            com.google.webrisk.v1.Submission.Builder,
            com.google.webrisk.v1.SubmissionOrBuilder>
        getSubmissionFieldBuilder() {
      if (submissionBuilder_ == null) {
        submissionBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.webrisk.v1.Submission,
                com.google.webrisk.v1.Submission.Builder,
                com.google.webrisk.v1.SubmissionOrBuilder>(
                getSubmission(), getParentForChildren(), isClean());
        submission_ = null;
      }
      return submissionBuilder_;
    }
<pre>
Required. The submission that contains the content of the phishing report.
</pre>

<code>
.google.cloud.webrisk.v1.Submission submission = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-webrisk/proto-google-cloud-webrisk-v1/src/main/java/com/google/webrisk/v1/CreateSubmissionRequest.java