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Installing Java


rev.dennis
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PART ONE

What is installed?

(This is for a x86_64 machine)

 

rpm -qa | grep ^jre

# jre-1.7.0_40-fcs.x86_64

 



[dhosang@localhost ~]$ rpm -qa | grep ^jre
jre-1.7.0_40-fcs.x86_64


check and download latest and greatest at www.java.com to /usr/java/

At the time of this article the latest is:  jre1.7.0_60

 



[dhosang@localhost ~]$ cd /usr/java
[dhosang@localhost ~]$ sudo rpm -Uvh jre-7u60-linux-x64.rpm


 

PART TWO

 

Check which java is set



[dhosang@localhost ~]$ sudo /usr/sbin/alternatives --config java
password for dhosang: 


There is 1 program that provides 'java'.


  Selection    Command
-----------------------------------------------
*+ 1           /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.4.3.0.fc20.x86_64/jre/bin/java


 

Check which plugin is set



[dhosang@localhost ~]$ sudo /usr/sbin/alternatives --config libjavaplugin.so.x86_64


If /usr/sbin/alternatives shows a wrong item remove it



[dhosang@localhost ~]$ sudo /usr/sbin/alternatives --remove libjavaplugin.so.x86_64 /usr/java/jre1.7.0_40/lib/amd64/libnpjp2.so


 

Install the newest one




[dhosang@localhost ~]$ sudo /usr/sbin/alternatives --install /usr/lib64/mozilla/plugins/libjavaplugin.so libjavaplugin.so.x86_64 /usr/java/jre1.7.0_60/lib/amd64/libnpjp2.so 1


 


Note: Remember, you've got to check alternatives --config java and alternatives --config libjavaplugin.so.x86_64 everytime you update java-1.7.0-openjdk and switch it back to java (oracle). 

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