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I'm trying to install JRE on Ubuntu 13.10. I followed this guide. When I run "java -version" it says "command not found"...
This is the result of "sudo find / -name java"
/var/lib/dpkg/alternatives/java
/usr/lib/jvm/java-7-oracle/bin/java
/usr/lib/jvm/java-7-oracle/jre/bin/java
/usr/lib/ure/share/java
/usr/local/java
/usr/local/java/jre1.7.0_51/bin/java
/usr/bin/java
/usr/java
Basically command not found happens when you didn't set up the PATH of installed java.
This guide here covers more about how to install java on a ubuntu machine completely, but here I'm just going to present how to setup your java runnable:
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jre1.7.0_51/bin/java" 1
sudo chmod a+x /usr/bin/java
and then
sudo update-alternatives --config java
Choose the one that has /usr/local/java/jre1.7.0_51/bin/java in the options.
You need to set your Java bin full path /jre1.7.0_51/bin to the PATH variable in your Shell window.
Like this
export PATH:$PATH:/jre1.7.0_51/bin
You can check the existing PATH by typing echo $PATH in your Shell window.
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I have installed Java 1.8.0_20 & I can't uninstall it. I have no Java folder in my Library so any other walkthroughs have been useless & every time I switch the preferred order it just sets back to normal as soon as I close Java preferences. I need like a terminal command or folder to go to manually delete it.
Yeah this is due to the fact that Oracle took no care now that they are owners of the Mac version (since 1.6). This is covered here.
Try these terminal commands:
sudo rm -rf /Library/Java/JavaVirtualMachines/jdk<version>.jdk
sudo rm -rf /Library/PreferencePanes/JavaControlPanel.prefPane
sudo rm -rf /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
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I want to start programming in java and i am using ubuntu 14.04, i downlaoaed
jdk-8u20-linux-x64.tar.gz
and in oracle website there is a command to install it, it is the command
% tar zxvf jdk-8uversion-linux-x64.tar.gz
in terminal i got this
bash: fg: %: no such job
anyone help me to intall the JDK.
Add the webupd8 ppa, and install from that -
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
Then
java -version
should show you using Oracle Java 8. If not, or if you want to use a different version - run update-java-alternatives with something like,
sudo update-java-alternatives -s java-8-oracle
or
sudo update-java-alternatives -s java-7-oracle
As appropriate.
Debian way (whereas Ubuntu is Debian-baseD) of doing it is through packages.
So it is highly preferred to make a deb package.
Here is how:
sudo apt-get install java-package
make-jpkg jdk-8u20-linux-x64.tar.gz
sudo dpkg -i oracle-java8-jdk_8u20_amd64.deb
Maybe there is already some PPA already doing it for you, but better trust no-one and do it for yourself ;-)
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I have Oracle JDK and JRE 1.5 installed ubuntu LTS. I want to keep JDK 1.5 and install Oracle JRE as 1.6. please let me know the steps or any clear source where I can get this done
A nice way to do this is by using the webupd8 PPA
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java6-installer
To switch which version is used when you type java (or javac etc..) use sudo update-alternatives --config java (or javac of course)
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I want to add java plugin for FireFox (v10.0.12) on Linux(Centos 5.6 64bit).
I have JDK 1.7.0_12 installed, and add a symbolic link to plugin folder under /usr/lib/mozilla to the file libnpjp2.so under (JRE)/lib/amd64/
Followd this
http://www.oracle.com/technetwork/java/javase/manual-plugin-install-linux-136395.html
But I still couldn't find java plugin on my Firefox Add-ons Manager.
What might be the problem ?
Do you want the JDK or the JRE? Anyways, I had this problem too, a few weeks ago. I followed the instructions here and it worked:
http://www.backtrack-linux.org/wiki/index.php/Java_Install
NOTE: Before installing Java make sure you kill Firefox.
root#bt:~# killall -9 /opt/firefox/firefox-bin
You can download java from the official website. (Download tar.gz version)
We first create the directory and place java there:
root#bt:~# mkdir /opt/java
root#bt:~# mv -f jre1.7.0_05/ /opt/java/
Final changes.
root#bt:~# update-alternatives --install /usr/bin/java java /opt/java/jre1.7.0_05/bin/java 1
root#bt:~# update-alternatives --set java /opt/java/jre1.7.0_05/bin/java
root#bt:~# export JAVA_HOME="/opt/java/jre1.7.0_05"
Adding the plugin to Firefox.
For Java 7 (32 bit)
root#bt:~# ln -sf $JAVA_HOME/lib/i386/libnpjp2.so /usr/lib/mozilla/plugins/
For Java 8 (64 bit)
root#bt:~# ln -sf $JAVA_HOME/jre/lib/amd64/libnpjp2.so /usr/lib/mozilla/plugins/
Testing the plugin.
root#bt:~# firefox http://java.com/en/download/testjava.jsp
you should add plug in to your local setting of firefox in your user home
vladimir#shinsengumi ~/.mozilla/plugins $ pwd
/home/vladimir/.mozilla/plugins
vladimir#shinsengumi ~/.mozilla/plugins $ ls -ltr
lrwxrwxrwx 1 vladimir vladimir 60 Jan 1 23:06 libnpjp2.so -> /home/vladimir/Install/jdk1.6.0_32/jre/lib/amd64/libnpjp2.so
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I've installed java(jre) on window 7. But I am not able to run java from command prompt .
I've set my JRE_HOME to "c:\Program Files (x86)\Java\jre6 " in Environment variables.But still it's not working.kindly help..
Make sure, that the bin folder of your JRE is added to the PATH variable. JAVA_HOME is irrelevant here.
JAVA_HOME is a convention - some tools use that environment variable to pick the location of the right java version. They use it to construct a path like this:
%JAVA_HOME%/bin/java -version
(that should work, by the way)
Add the location of the bin directory to the front of your PATH environment variable.
The simplest way to get a default Java is to go to http://java.com and let it install what it feels like. This will be available in your PATH.
Use this command at cmd (assuming java is installed at "C:\Program Files\Java" and version is 1.6.0):
set path=;"C:\Program Files\Java\jdk1.6.0\bin\";