What could cause false change of sha1 checkmap?

Question

I am boggled by the fact that the sha1 sum started to change without change in the java classes.

I have reverted changes to the files, recompiled the project and I get a different checksum than the one that should be. The last change of the package was 1 year ago, and it started to give a different sum Today.

My question is:

What if anything, can be the cause of a sha1 sum to start giving a different result ?

Like I said the files have been reverted to the state that they were 1 year ago and still different.

Maybe whitspaces? These are sometimes ignored by version control. — Matthias, Mar 09 '17 at 13:47
well, I reverted it so it should be identical, no ? I'm using eclipse+git for version control — Nikola Hristov, Mar 09 '17 at 13:48
Git can modify line endings when getting text files to match the target OS — ZhekaKozlov, Mar 09 '17 at 13:51

score 0 · Answer 1 · answered Mar 09 '17 at 14:13

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If you use a different compiler or a different version of the compiler or even different settings to the compiler it could pretty well be, that a different .class file is generated checksumwise. It should behave the same though.

answered Mar 09 '17 at 14:13

Vampire

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score 0 · Answer 2 · answered Mar 10 '17 at 07:01

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Turns out tests that use these files were the culprit.

answered Mar 10 '17 at 07:01

Nikola Hristov

1

What could cause false change of sha1 checkmap?

2 Answers2