public Builder clearUser() {
      if (principalCase_ == 1) {
        principalCase_ = 0;
        principal_ = null;
        onChanged();
      }
      return this;
    }
<pre>
The user who needs to be granted permission.
</pre>

<code>string user = 1;</code>

@return This builder for chaining.
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/Principal.java