On 29/05/15 23:13, Colin Holgate wrote:
I have a need to edit a single character in a class file inside a jar file. My 
steps are:

rename the file to .zip
expand it
use a hex editor to make the single character change
compress the folder
rename back to jar

The jar file I get is seen to be bad. If I leave out the class editing, and 
just rename, decompress, compress, rename, that’s enough for the jar to not 
work.

Anyone have some insights as to how to expand and archive a jar file, without 
breaking it?


I know NOTHING about this; but a few minutes with Ask.com did yield this:

http://blog.opensecurityresearch.com/2013/04/creating-extracting-and-signing-jars.html

and this:

https://confluence.atlassian.com/display/CONFKB/How+to+edit+files+in+Confluence+JAR+files

The second one seems a bit odd; the first one makes sense to me in terms of what you have written.

Richmond.

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