California Codes, Code of Civil Procedure - CCP, Part 2 — Of Civil Actions, Title 10 — Actions in Particular Cases, Chapter 9 — Validating Proceedings, Section 870

(a) The judgment, if no appeal is taken, or if taken and the judgment is affirmed, shall, notwithstanding any other provision of law including, without limitation, Sections 473 and 473.5, thereupon become and thereafter be forever binding and conclusive, as to all matters therein adjudicated or which at that time could have been adjudicated, against the agency and against all other persons, and the judgment shall permanently enjoin the institution by any person of any action or proceeding raising any issue as to which the judgment is binding and conclusive.

(b) Notwithstanding any other provision of law including, without limitation, Section 901 and any rule of court, no appeal shall be allowed from any judgment entered pursuant to this chapter unless a notice of appeal is filed within 30 days after the notice of entry of the judgment, or, within 30 days after the entry of the judgment if there is no answering party. If there is no answering party, only issues related to the jurisdiction of the court to enter a judgment in the action pursuant to this chapter may be raised on appeal.