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Full Discussion: Installing Java Problems
Top Forums UNIX for Dummies Questions & Answers Installing Java Problems Post 302503804 by yifangt on Friday 11th of March 2011 05:47:52 PM
Old 03-11-2011
similar question but for upgrade
I was trying to upgrade my java 1.6.0_20 to java 1.6.0_24 as a self-learning experience. Felt nervous and want to know the right way. Yes, I downloaded the file from SUN:
Code:
jre-6u24-linux-x64.bin

and executed it. It was successfully installed in my local folder
Code:
/Downloads/jre1.6.0_24/

But, when I check the version it still displayed the old version which is linked the java executable by two symlinks after I recursively checked each file (for simplicity I put them directly here):
Code:
$ java -version
java version "1.6.0_20"
$which java
/usr/bin/java---> /etc/alternatives/java--->/usr/lib/jvm/java-6-openjdk/jre/bin/java

Now, my question is: can I replace the old java executable with the new one, or simply replace the whole folder that contains the java executable? I am aware there some new files. Not sure the whole story while I am trying to understand the basics.
I am using Ubuntu 10.10 Maverick Meerkat - released in October 2010 amd64-server in linux kernel 2.6.35.27-server & gnome 2.32.0.
Please someone give me a explanation. Thanks a lot!

Yifang
 

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LEARN ABOUT DEBIAN

update-java-alternatives

UPDATE-JAVA-ALTERNATIVES(8)				      System Manager's Manual				       UPDATE-JAVA-ALTERNATIVES(8)

NAME

       update-java-alternatives - update alternatives for jre/sdk installations

SYNOPSIS

       update-java-alternatives [--jre] [--plugin] [-t|--test|-v|--verbose]
	     -l|--list [<jname>]
	     -s|--set <jname>
	     -a|--auto
	     -h|-?|--help

DESCRIPTION

       update-java-alternatives  updates  all alternatives belonging to one runtime or development kit for the Java language.  A package does pro-
       vide these information of it's alternatives in /usr/lib/jvm/.<jname>.jinfo.

OPTIONS

       -l|--list [<jname>]
	      List all installed packages (or just <jname>) providing information to set a bunch of java alternatives. Verbose output  shows  each
	      alternative provided by the packages.

       -a|--auto
	      Switch all alternatives of registered jre/sdk installations to automatic mode.

       -s|--set <jname>
	      Set all alternatives of the registered jre/sdk installation to the program path provided by the <jname> installation.

       --jre  Limit the actions to alternatives belong to a runtime environment, not a development kit.

       --jre-headless
	      Limit the actions to alternatives belong to the headless part of a runtime environment.

       --plugin
	      Limit the actions to alternatives providing browser plugins.

       -h|--help
	      Display a help message.

       -t|--test
	      Don't  actually do anything, just say what would be done.  The implementation status of this option is the same as for update-alter-
	      natives (not implemented).

       -v|--verbose
	      Verbose output.

FILES

       /usr/lib/jvm/.*.jinfo
	      A text file describing a jre/sdk installation. Consists of some variables of the form <var>=<value> and a list  of  alternatives	of
	      the form jre|jdk <name> <path>.

AUTHOR

       update-java-alternatives and this manual page was written by Matthias Klose <doko@ubuntu.com>.

								     May 2006					       UPDATE-JAVA-ALTERNATIVES(8)
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