Self-extracting jre instructions
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1. You need 7za and 7zCon.sfx from the p7z-essentials folder to generate the self-extracting jre from the jre

2. Need the jre for your java version.
Java 8 should be used for Expeditee.
The jre should be extracted into a folder named jre. Also, don't make it a tar file for Expeditee. (Greenstone expects the jre to be tarred up first.)

3. Run:
./p7z-essentials/7za a -sfx -mx=9 jre_bin[_x64] /path/to/your-jdk-version/jre

* -m0=lzma2 is already done automatically, setting the compression mode to lzma2.
* -mx=9 set its to ultra (compression? speed?)
* the output file name expected by the release-kit is jre_bin for 32 bit linux, jre_bin_x64 for 64 bit linux
* -sfx indicates that it will generate a self-extracting binary out of the input file
* the "a" indicates it will add the files from the input folder (the /path/to/your-jdk-version/jre in this case) to the output file