Assembly

The names of the product elements.

The name of the type.

Stamp every entry under the open jar filesystem zipRoot with fixedEntryTime, making the jar byte-for-byte reproducible. The JDK zip filesystem otherwise records the current wall-clock time (modification, access, and creation, the latter two via an extended-timestamp extra field) on each entry and on the directories it lazily creates.

Two quirks of the JDK zip filesystem dictate the approach:

• all three times must be pinned, not just the modification time, or the access/creation times in the extended-timestamp extra field still vary between builds; and
• directory entries must be stamped last, since setting a directory's time corrupts the filesystem's internal index and makes a subsequent setTimes on any entry throw.

Fixed timestamp stamped onto every assembly jar entry so the jar is byte-for-byte reproducible. The JDK zip filesystem otherwise records the current wall-clock time on each entry. 2010-01-01 (UTC) is an arbitrary constant above the 1980 DOS-time floor.