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Q: What is the relationship between a CSR and a JEP?
A: A JEP (JDK Enhancement-Proposal) initially describes a project to update some aspect of the JDK. The exact details of the updates are usually not yet known when the JEP begins. As the JEP matures, the updates to the JDK associated with the JEP are pushed under on more more changesets. Each changesets that involves a specification change (or sufficiently large compatibility impact) would also require CSR review.
Q: Do incubating modules shipped with the JDK require CSR review?
A: An incubating module (JEP 11: Incubator Modules) contains non-final APIs shipped with the JDK to gather feedback. While such APIs don't have the same long-term prospects as Java SE APIs, they are still widely usable and subject to CSR review.
Q: How many CSR requests are typically in a release?
A: For JDK 9, there were approximately 900 CCC requests (the CCC being the internal predecessor to the CSR), approximately 90 JEPs, and over 14,000 bug fixes. Having a single-digit percentage of fixes need to go through compatibility and specification review has been consistent over time.
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