JDK-8073497 : Lazy conversion of ZipEntry time
  • Type: Enhancement
  • Component: core-libs
  • Sub-Component: java.util.jar
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2015-02-19
  • Updated: 2016-05-27
  • Resolved: 2015-02-28
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8u60Fixed 9 b54Fixed
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When reading java.util.zip.ZipEntry:s from a zip archive, java.util.zip.ZipUtils.dosToJavaTime is called eagerly.

This forces initialization of deprecated java.util.Date utilities early in the startup to evaluate values. 

In practice the VM typically never look at the ZipEntry.getTime(). Preliminary testing shows this can have a positive impact on startup and VM footprint. 
The time field and its conversion was lazy pre-8-b94, where it was removed in favor of the FileTime fields, then the ZipEntry.time field was reintroduced but in the current, eager fashion. I think it's thus safe to consider the current behavior a regression due to the sum of these changes.