public Builder setMigratingVm(com.google.cloud.vmmigration.v1.MigratingVm value) {
      if (migratingVmBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        migratingVm_ = value;
      } else {
        migratingVmBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000004;
      onChanged();
      return this;
    }
<pre>
Required. The create request body.
</pre>

<code>
.google.cloud.vmmigration.v1.MigratingVm migrating_vm = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/CreateMigratingVmRequest.java