private com.google.protobuf.SingleFieldBuilderV3<
              com.google.cloud.workstations.v1.WorkstationConfig.Host.GceInstance,
              com.google.cloud.workstations.v1.WorkstationConfig.Host.GceInstance.Builder,
              com.google.cloud.workstations.v1.WorkstationConfig.Host.GceInstanceOrBuilder>
          getGceInstanceFieldBuilder() {
        if (gceInstanceBuilder_ == null) {
          if (!(configCase_ == 1)) {
            config_ =
                com.google.cloud.workstations.v1.WorkstationConfig.Host.GceInstance
                    .getDefaultInstance();
          }
          gceInstanceBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.cloud.workstations.v1.WorkstationConfig.Host.GceInstance,
                  com.google.cloud.workstations.v1.WorkstationConfig.Host.GceInstance.Builder,
                  com.google.cloud.workstations.v1.WorkstationConfig.Host.GceInstanceOrBuilder>(
                  (com.google.cloud.workstations.v1.WorkstationConfig.Host.GceInstance) config_,
                  getParentForChildren(),
                  isClean());
          config_ = null;
        }
        configCase_ = 1;
        onChanged();
        return gceInstanceBuilder_;
      }
<pre>
Specifies a Compute Engine instance as the host.
</pre>

<code>.google.cloud.workstations.v1.WorkstationConfig.Host.GceInstance gce_instance = 1;
</code>
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/WorkstationConfig.java