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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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DACS.JAVA(7)						  DACS Miscellaneous Information					      DACS.JAVA(7)

NAME
dacs.java - DACS Java support DESCRIPTION
This document describes support for Java provided by DACS. To enable Java support, DACS must be configured using the --enable-java flag. It may also be necessary to specify the location of the Java commands and include files. See dacs.install(7)[1]. Note Java support is currently very limited and should be considered experimental. It is currently only possible to call dacsauth(1)[2] and dacscheck(1)[3] using the Java Native Interface (JNI) provided. The command line arguments to both of these commands are exactly as documented in their manual pages. Each argument is passed as a String. The code is not thread-safe and is probably not suitable for being called many times within a particular process due to assumptions it makes about dynamic memory allocation. There are no immediate plans to improve or extend Java support. Using the existing capability to build the JNI layer, however, it should not be difficult for an experienced Java programmer to build upon the example Java code provided. With Java support enabled, building DACS will copy the JNI shared library and a .jar file to the library directory (default: /usr/local/dacs/lib), and the JNI include files to the include directory (default: /usr/local/dacs/include). The tools/java/jni distribution directory contains a simple script called javarun that demonstrates how to run dacsauth or dacscheck as a Java application. For example, to validate the Unix password for user somebody, run (as root): ./javarun dacsauth -m unix suff -user somebody -prompt DIAGNOSTICS
The return codes are as documented in the command's manual page. AUTHOR
Distributed Systems Software (www.dss.ca[4]) COPYING
Copyright2003-2012 Distributed Systems Software. See the LICENSE[5] file that accompanies the distribution for licensing information. NOTES
1. dacs.install(7) http://dacs.dss.ca/man/dacs.install.7.html 2. dacsauth(1) http://dacs.dss.ca/man/dacsauth.1.html 3. dacscheck(1) http://dacs.dss.ca/man/dacscheck.1.html 4. www.dss.ca http://www.dss.ca 5. LICENSE http://dacs.dss.ca/man/../misc/LICENSE DACS 1.4.27b 10/22/2012 DACS.JAVA(7)
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