java


Why does the same JAR file have different hash every time I build it?


I've been thinking about checking jar file's hash value to determine if it has changed or not, but as it turns out the same jar file has different hashes every time I build it (export as jar file from eclipse, or build it using maven). I've removed manifest file's date values and stuff but it still is different. Is there something in bytecode generation which includes a timestamp or something?
A JAR file is a ZIP file and it contains a last modified date in its local file headers and central directory file header. This will lead to different hashes of your builds.
If you run the JAR command on the exact same set of files (with same file dates) and skip manifest file creation it should give you the exact same JAR file (if the order of files inside the ZIP does not change).

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