Completely remove Java 1.8 and install 1.7

Trotel · 04-14-2014, 05:56 PM

Hi everyone.

I'am beginner in Linux. I need run a program from the web and I need Java
this is the command.

Code:

javaws http://blast2go.com/webstart/blast2go1000.jnlp

Here is the problem: I need java 6 o 7, but I have installed java 8, so I download the 7 (rpm) but show me that I can't install it because I have the last version. So I download the tar.gz and install it. I decompress it in /opt

Code:

alternatives --install /usr/bin/java java /opt/jdk1.7.0_51/bin/java 2
alternatives --install /usr/bin/javaws javaws /opt/jdk1.7.0_51/bin/javaws 2
alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_51/bin/javac 2
alternatives --config java
alternatives --config javaws 
alternatives --config javac

then a add export JAVA_HOME=/opt/jdk1.7.0_51/bin in /etc/profile
Well when I type: java -version it show me "1.7.0_51", nice!, but when I try to run my program it show me

Code:

Java Version Problem: You are executing Blast2GO with Java 1.8
This Java Version is not supported and Blast2GO should be executed with Java 1.6 or 1.7
Blast2GO will now exit

How I can completely remove Java 8 and install Java 7
When I update my sistem, Is the java updated too?

Please I need a help.

Thanks.

suDoh! · 04-15-2014, 07:11 AM

Try running "rpm -qa jdk"... you should get some output that looks roughly like... jdk1.8.0-2.32.fcs.x64

Remember, the text may vary, but if you get it, copy that file name and run this: "rpm -e <jdk_file_name_here>

Once it is over, check under the path where you installed java initially and remove the dirs (if any)..i.e. include/jre etc...

Then install the 1.6/1.7 version and it should go in...

Cheers!

John VV · 04-15-2014, 01:42 PM

rpm and java8

WHAT!!!! operating system is this ??

fedora 20 ?????????
if so
fedora already has installed OpenJDK BY DEFAULT

Orcals java is INCOMPATIBLE

openjdk must be uninstalled then replaced with Oracles JDK

so before we try to walk you through it

What Operating System and Version are you using