remove Open JDK and install Oracle JDK

Tom Dunne · 27-06-2014 9:26am #1

I'm hoping to do some development on Linux Mint, but it needs the Oracle JDK, Open JDK is installed by default.

/usr/bin/java is a symlink to /etc/alternatives/java, which in turn is a symlink to /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java.

So I'm wondering if it is as simple as removing the /usr/bin/java symlink and pointing it to my new Oracle 8 JDK install?

Khannie · 27-06-2014 9:45am

That should do the trick for the basics, but there is a thing about "alternatives" and I'm not sure how that will affect other programs (like a browser for example). How did you install the Oracle JDK?

micko45 · 27-06-2014 10:22am

Can't you put it into /usr/local/java and point to it (from your scripts/programs i mean and not change the link)
I would leave the system installed Java alone, we always get developers to use a different java/perl than the system installed ones, then when you do a update no surprises and stuff stops working .

croo · 27-06-2014 4:31pm

Mint is based on Ubuntu so I'm guessing the following applies equally
update-java-alternatives

Tom Dunne · 28-06-2014 8:23am

Khannie wrote: »

That should do the trick for the basics, but there is a thing about "alternatives" and I'm not sure how that will affect other programs (like a browser for example). How did you install the Oracle JDK?

I just downloaded Netbeans with the Java 8 SDK, so I put it in my /home directory temporarily.

croo wrote: »

Mint is based on Ubuntu so I'm guessing the following applies equally
update-java-alternatives

I played with that for a while, but that command appears to be for switching between versions, as opposed to installing a new version.

In the end I went with this: https://www.digitalocean.com/community/tutorials/how-to-install-java-on-ubuntu-with-apt-get

Command line saves the day, again.

croo · 28-06-2014 1:51pm

Tom Dunne wrote: »

I played with that for a while, but that command appears to be for switching between versions, as opposed to installing a new version.

Yeah, it is. I thought you said you had installed the oracle jdk and you wanted to change the sym-link... the update-alternatives is the easiest way ensuring all is changed correctly.

Tom Dunne · 28-06-2014 3:05pm

croo wrote: »

Yeah, it is. I thought you said you had installed the oracle jdk and you wanted to change the sym-link... the update-alternatives is the easiest way ensuring all is changed correctly.

I had it downloaded and untarred into a directory. Maybe that's not quite "installed".

croo · 29-06-2014 9:28am

Tom Dunne wrote: »

I had it downloaded and untarred into a directory. Maybe that's not quite "installed".

I think (not 100% but pretty sure) there is a package to install with apt-get... I had just assumed you'd used it. But whatever works

GreenWolfe · 30-06-2014 7:59pm

croo wrote: »

I think (not 100% but pretty sure) there is a package to install with apt-get... I had just assumed you'd used it. But whatever works

Distributions had to take it out when Oracle took over Sun, they aren't allowed to redistribute Oracle's JDK themselves anymore:

http://www.omgubuntu.co.uk/2011/12/java-to-be-removed-from-ubuntu-uninstalled-from-user-machines

Webupd8 have a PPA for Ubuntu and there are plenty of guides out there for CentOS. After that, you'll have to Google for what you need.

CentOS JDK7: http://www.if-not-true-then-false.com/2010/install-sun-oracle-java-jdk-jre-7-on-fedora-centos-red-hat-rhel/

CentOS JDK8: http://www.if-not-true-then-false.com/2014/install-oracle-java-8-on-fedora-centos-rhel/

Ubuntu JDK7: http://www.webupd8.org/2012/09/install-oracle-java-8-in-ubuntu-via-ppa.html

Ubuntu JDK8: http://www.webupd8.org/2013/09/oracle-java-7-update-40-7u40-released.html

croo · 30-06-2014 8:56pm

GreenWolfe wrote: »

Distributions had to take it out when Oracle took over Sun, they aren't allowed to redistribute Oracle's JDK themselves anymore...

You're right... I'd forgotten that!

10-10-20 · 30-06-2014 10:08pm

I installed it last night to get Minecraft working on this laptop for my son.

Yeah, this is a bit basic, but it replaces all of the defaults & updates apt and worked.
http://www.wikihow.com/Install-Oracle-Java-JRE-on-Ubuntu-Linux

remove Open JDK and install Oracle JDK

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