# Trying to find where Java "JRE" is located on Ubuntu 7.10 machine? **URL:** \ **Category:** Deployment\ **Created:** [January 14, 2008, 5:51pm UTC](https://www.ruby-forum.com/t/trying-to-find-where-java-jre-is-located-on-ubuntu-7-10-machine/196571 "2008-01-14T17:51:06Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [January 14, 2008, 5:51pm UTC](https://www.ruby-forum.com/t/trying-to-find-where-java-jre-is-located-on-ubuntu-7-10-machine/196571/1 "2008-01-14T17:51:06Z")
I’ve spent the last year developing a large Ruby on Rails 2.0 application with over a 100 tables and controllers and hope to be deploying it soon. Before I moved from my Windows XP computer to deployment, I wanted to run it in a local Linux environment to sort out: 1. Amazon S3 files 2. RMagick (went south when I upgraded to Rails 2.0) 3. ARMailer (mail spooling program) I’ve installed Ubuntu 7.10 and feel running the scripts to install Ruby and Rails are reasonable straightforward. I plan to run an Nginx server with multiple Mongrel clusters using Capistrano. What’s killing me is installing a graphic development environment such as Radrails (which I love on Windows XP) or Netbeans. Understand that I’ve been through the routine of installing “sudo apt- get install sun-java6-jre” many times. Once, for some unknown reason my Netbeans 6.0 came up fine (as it found the JRE location on its own), but I was unsure how it happened and elected to re-install my Ubuntu and try again. Anyway, I’m able to install the Netbeans to the point where it asks for the location of the “JRE”. The one time that it worked, this value was automatically filled in when Netbeans started for the first time. When I run “java -version” I get the latest 1.6 installation but can’t find out where the “JRE” is located. I’ve looked MANY places. Anyway, I’m desperate to move this project along and am happy to hire someone to consult on this matter. I am grateful for your reply. Kathleen Kennedy removed\_email\_address@domain.invalid ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [January 15, 2008, 4:19am UTC](https://www.ruby-forum.com/t/trying-to-find-where-java-jre-is-located-on-ubuntu-7-10-machine/196571/2 "2008-01-15T04:19:48Z")
Hi, I dont know if anyone answered you but I believe its found in /usr/lib/jvm/java-6-sun/jre Regards, Jose. On Jan 14, 2008 11:05 AM, removed\_email\_address@domain.invalid [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I’ve installed Ubuntu 7.10 and feel running the scripts to install > for the location of the “JRE”. The one time that it worked, this value – “Eppure si muove” ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [January 15, 2008, 10:34pm UTC](https://www.ruby-forum.com/t/trying-to-find-where-java-jre-is-located-on-ubuntu-7-10-machine/196571/3 "2008-01-15T22:34:37Z")
Jose, My question turned out to be a ‘trick question’ as I found out that I must install the JDK and NOT the JDR to work with Netbeans on Ubuntu 7.10. I am always amazed how the community seems to leave these LOCKED DOORS with no explanation. If you’re tasked with such an endeavor, please feel free to contact me. Thank you, Kathleen ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [January 21, 2008, 2:17am UTC](https://www.ruby-forum.com/t/trying-to-find-where-java-jre-is-located-on-ubuntu-7-10-machine/196571/4 "2008-01-21T02:17:50Z")
That’s the unsaid open source credo: “Open but you have to work for it” On Jan 15, 3:33 pm, “removed\_email\_address@domain.invalid” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [January 21, 2008, 3:38pm UTC](https://www.ruby-forum.com/t/trying-to-find-where-java-jre-is-located-on-ubuntu-7-10-machine/196571/5 "2008-01-21T15:38:07Z")
Next time try running ‘which java’. ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [January 27, 2008, 12:06pm UTC](https://www.ruby-forum.com/t/trying-to-find-where-java-jre-is-located-on-ubuntu-7-10-machine/196571/6 "2008-01-27T12:06:56Z")
On ubuntu ‘which java’ will return /usr/bin/java which is a symlink to /etc/alternatives/java on ubuntu This mechanism allows multipe jre/jdks to be installed. You can list, and set what the version of java is being used with update-alternatives update-alternatives --list java The output should look like something like this depending on versions installed. /usr/lib/jvm/java-1.5.0-sun/jre/bin/java /usr/lib/jvm/java-6-sun/jre/bin/java /usr/bin/gij-4.2 /usr/lib/jvm/java-gcj/jre/bin/java /usr/bin/gij-4.1 You can then set which one to use as follows sudo update-alternatives --set java /usr/lib/jvm/java-1.5.0-sun/jre/bin/java Afterwards java -version returns java version “1.5.0\_13” Java™ 2 Runtime Environment, Standard Edition (build 1.5.0\_13-b05) Java HotSpot™ Server VM (build 1.5.0\_13-b05, mixed mode) I hope this helps. Regards, John removed\_email\_address@domain.invalid wrote: > > > > > Anyway, I’m able to install the Netbeans to the point where it asks > > > > > – > > > > > > > > “Eppure si muove”- Hide quoted text - > > > > > > > > - Show quoted text - [http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&ll=53.40462,-6.364946&spn=0.033004,0.11467&z=14&om=1&msid=116685921175017216102.0004394bd4ce4dfebdfc3](http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&ll=53.40462,-6.364946&spn=0.033004,0.11467&z=14&om=1&msid=116685921175017216102.0004394bd4ce4dfebdfc3)