Allow packr without JRE

[Jyro117]

Would really like a way to package an application that uses the system JRE instead of packing a minimized version. This way I can instead require users to have Java installed and reduce the size of my application.

[badlogic]

Interesting idea. Not sure how we could achieve that. We'd need a way to
figure out the location of the system JVM.

On Thu, May 29, 2014 at 6:20 PM, Devin Chollak notifications@github.com
wrote:

Would really like a way to package an application that uses the system JRE
instead of packing a minimized version. This way I can instead require
users to have Java installed and reduce the size of my application.

—
Reply to this email directly or view it on GitHub
#17.

[Jyro117]

I know on Linux and Windows, if a Java JRE 7 or 8 is installed it will be on the system path by default. Mac OS X I do not know if that is the case.

Potentially if it isn't found, a prompt to: https://www.java.com/en/download/ could be an alternative.

I know Eclipse provides an executable for all platforms which can run without packaging a JRE.

This is similar to how Launch4j works: http://launch4j.sourceforge.net/; however, I'm looking for a solution for Mac OS X and Linux, since Launch4j is only for Windows deployments.

[koesie10]

According to Stack Overflow, the most recent Java version is always registered in the registry on Windows. The following steps would need to be executed:

• Open the key HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment
• Read the CurrentVersion REG_SZ
• Open the subkey under Java Runtime Environment named with the CurrentVersion value
• Read the JavaHome REG_SZ to get the path

I don't know about the other ones though.

[badlogic]

I'm afraid this is not a goal for Packr. I'm happy to receive PRs for this, but will likely not spend any time on this myself.