can be set up whenever it is sought to be enforced or is acted upon as a foundation for a right, even at the stage of execution or in collateral proceedings. The defect of jurisdiction strikes at the authority of the court to pass a decree which cannot be cured by consent or waiver of the party. If the court has jurisdiction but there is defect in its exercise which does not go to the root of its authority, such a defect like pecuniary or territorial could be waived by the party. They could be corrected by way of appropriate plea at its inception or in appellate or revisional forums, provided law permits. The doctrine of res judicata under Section 11 CPC is founded on public policy. An issue of fact or law or mixed question of fact and law, which are in issue in an earlier suit or might and ought to be raised between the same parties or persons claiming under them and was adjudicated or allowed uncontested becomes final and binds the parties or persons claiming under them. Thus the