Hi, a trivial optimization to ZipFile.getEntryPos extracted from some experiments conducted mostly by Eirik Bjørsnøs.
Webrev: http://cr.openjdk.java.net/~redestad/8242842/open.00/ Bug: https://bugs.openjdk.java.net/browse/JDK-8242842 This removes an extra array copy on every miss, and the patch means a small speed-up on a few startup applications I've tested (Spring Petclinic: ~50ms faster). This is an optimization which was lost in translation when porting from native to Java[1] in JDK 9. The native implementation allocates an array that can fit the extra '/' if needed, and updates the array in place for the follow-up check. Thanks! /Claes [1] https://bugs.openjdk.java.net/browse/JDK-8145260
