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I am trying to installing on Centos java from Oracle. Following are my steps.

yum install /usr/local/jdk-7u3-linux-x64.rpm


alternatives --install /usr/bin/java java /usr/java/latest/jre/bin/java 20000

alternatives --install /usr/bin/javaws javaws /usr/java/latest/jre/bin/javaws 20000

alternatives --install /usr/bin/javac javac /usr/java/latest/bin/javac 20000

alternatives --config java I pick the latest version here.

The problem now only my java is pointing to the new version wheras the javac is not pointing to it below is how I trace for java and javac.

Java

 ls -la /usr/bin/java lrwxrwxrwx. 1 root root 22 May 22 13:09 /usr/bin/java -> /etc/alternatives/java

 ls -la /etc/alternatives/java lrwxrwxrwx. 1 root root 25 May 22 13:09 /etc/alternatives/java -> /usr/java/latest/bin/java

Javac

ls -la /usr/bin/javac lrwxrwxrwx. 1 root root 23 May 22 11:37 /usr/bin/javac -> /etc/alternatives/javac

 ls -la /etc/alternatives/javac lrwxrwxrwx. 1 root root 48 May 22 11:37 /etc/alternatives/javac -> /usr/lib/jvm/java-1.7.0-openjdk.x86_64/bin/javac 

Any solution to overcome this? I have tried previously on other machines on Centos 6.3 works fines.

share|improve this question
    
alternatives --config javac –  jordanm May 27 '13 at 17:06
    
ok so wat should I do just the right one is it? But why this did not work alternatives --install /usr/bin/javac javac /usr/java/latest/bin/javac 20000 –  biz14 May 27 '13 at 17:07
    
That installs a new alternative, it does not set it as the current selected alternative. –  jordanm May 27 '13 at 22:32
    
Ok I will try and update you on this. Thank you. –  biz14 May 28 '13 at 3:28
    
Great it is working well now. So should I make sure each time I install java to pick to set both java and javac? I would like to confirm the rest of the steps are they ok ? –  biz14 May 28 '13 at 12:36

1 Answer 1

up vote 1 down vote accepted

Here is a blog post I made that shows a detailed example of installing Java and setting the default with alternatives. Note: sometimes people install Java JDK's into '/usr/lib/jvm', and as you can see in the output on my blog post, the system came with default JVMs in this location, but personally I don't recommend that for a JDK. Maybe I would choose '/usr/lib/jvm' if it was a JRE I was installing. If you wanted an alternative location for JDKs and JREs, I would choose either:

   1. /usr/java/
   2. /opt/java/

If I were comparing to windows, I might say:

JDKs: /usr/java = C:\Java
JREs: /usr/lib/jvm = C:\Program Files\Java
Alt:  /opt/java = E:\Java
share|improve this answer
    
I saw your blog but you are using rpm I used yum install is that better ? So I should config both java and javac right. How about the alternatives should I still set them? –  biz14 Jun 5 '13 at 4:58
    
There is a "alternatives-java" command that you can use (instead of plain 'alternatives') that might be capable of updating all the symlinks for all the programs within a particular JDK. I've not tried it yet. Using rpm, Yum, or whatever, the install location may vary depending on the opinion of the person who made the installer. I always prefer .bin (or .zip) archives because you can unzip them to wherever you want and you can be more intentional about it. –  djangofan Jun 13 '13 at 21:02

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