private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmwareengine.v1.Principal,
            com.google.cloud.vmwareengine.v1.Principal.Builder,
            com.google.cloud.vmwareengine.v1.PrincipalOrBuilder>
        getPrincipalFieldBuilder() {
      if (principalBuilder_ == null) {
        principalBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmwareengine.v1.Principal,
                com.google.cloud.vmwareengine.v1.Principal.Builder,
                com.google.cloud.vmwareengine.v1.PrincipalOrBuilder>(
                getPrincipal(), getParentForChildren(), isClean());
        principal_ = null;
      }
      return principalBuilder_;
    }
<pre>
Required. The consumer provided user/service account which needs to be
granted permission to bind with the intranet VPC corresponding to the
consumer project.
</pre>

<code>
.google.cloud.vmwareengine.v1.Principal principal = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/RevokeDnsBindPermissionRequest.java