TEXAS RULES OF CIVIL PROCEDURE / RULE 124
TRCP 124: No judgment without service
Service, waiver and appearance prerequisites for judgment, with a separate provision for counterclaims and cross-claims.
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In no case shall judgment be rendered against any defendant unless upon service, or acceptance or waiver of process, or upon an appearance by the defendant, as prescribed in these rules, except where otherwise expressly provided by law or these rules.
When a party asserts a counterclaim or a cross-claim against another party who has entered an appearance, the claim may be served in any manner prescribed for service of citation or as provided in Rule 21(a).