...
At the end of the month prior to the release month, the jdk21u repository is declared frozen so embargoed security fixes can be added in private during the final few weeks. On release day, the final version will be pushed to the jdk21u repository and source bundles made available.
Repositories
jdk21u-dev: Always open repository for development of upcoming JDK 21 Update releases. Pushes after jdk21u-fix-yes approval. Check here for clearance.
jdk21u: Repository used for Rampdown of JDK 21 Update releases. Pushes only during 4-weeks rampdown period after jdk21u-critical-yes approval. Check here for clearance.
...