# How to correctly remove OpenJDK/OpenJRE and set SunJDK/SunJRE as Default

Ubuntu seems to favour OpenJDK/JRE very much over Sun JDK/JRE. Even after I installed Sun JRE, JDK and plugin and spent some time plucking out OpenJDK-related packages, apt-get has installed them back with some packages as a dependency. Can this behaviour be corrected in favour of Sun Java packages? I'd like to have one and only Java stack installed (yes, it's a bit of OCD, but I like to have my systems clean) and want it to be Sun Java.

Update: as Marcos Roriz notes, the problem seems to be in default-jre (on which Java-dependent packages use to depend) pointing to OpenJDK, so the question seems to go about how to hack default-jre/default-jdk to point to Sun Java.

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## Installing Sun Java on Older Versions of Ubuntu (9.10 and below)

I had the same problem once about three years ago with Ubuntu 8.04 I think. There was a weird problem when using openjre and the problem was solved by using the sun jre version. Here are the steps in the terminal which apply to versions below 10.04, since starting from 10.04 sun java has been dropped and replaced by openjre:

sudo apt-get remove openjdk-6-jre default-jre default-jre-headless

sudo apt-get install sun-java6-jre sun-java6-bin sun-java6-plugin sun-java6-fonts


(Everything Sun java related. Just to make sure)

After that, if you removed openjdk then you would only have sun java. If you did not remove it then you have both of them. To change from one to another do this:

sudo update-java-alternatives -l - This will show you the list of java engines you can use.

The name of the java alternative is the one in the left so for example openjdk would appear like this:

java-6-openjdk 1061 /usr/lib/jvm/java-6-openjdk


And you would set the system to openjdk like this:

sudo update-java-alternatives -s java-6-openjdk


If you would want to use Sun then you would do this (After installation of the sun packages):

sudo update-java-alternatives -s java-6-sun


If you want to use the java 7 version, simply change the number 6 mentioned above for 7. For example if I wanted to install the openjre version 7 I would:

sudo apt-get install openjdk-7-jre default-jre default-jre-headless


## Installing Sun Java on Newer versions of Ubuntu (10.04 an above)

Open the terminal and type the following:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer


That should install the Sun Java version on your system. To change to it simply do the following in case you have other java alternatives:

sudo update-java-alternatives -s java-7-oracle


If you want the installation to be automatic type the following:

sudo echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | sudo /usr/bin/debconf-set-selections


after that simply do the following to set the default environment variables:

sudo apt-get install oracle-java7-set-default


Note that the PPA includes versions 6, 7 and 8. So you can install any of them by simply changing the number in the installation line, for example:

sudo apt-get install oracle-java8-installer


Would install Java 8. After installing the Java version you wish to use and setting the version to the default with the update-java-alternatives command, you can check which version you are using by typing the following:

java -version


It will show you the default version you are using at that moment.

I would like to also mention that OpenJRE/JDK has come a long way from 2 or 3 years ago when it had many issues that were solved by changing to Sun Java.

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I think the problem is that some Java packages rely on default-jre which points to openjdk-jre. I don't think there is a easy way to permanetely uninstall openjdk. The thing is that you probably will bump on openjdk again when you install a java package/program.

But if you're willing to have both, is it easy to set the java runtime programs (java, javah, javap, and so on) to sun implementation. Do it:

sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts


or if you are a java dev (install the sdk and srcs):

sudo apt-get install sun-java6-jdk sun-java6-jre sun-java6-source


And set it as the default programs with:

sudo update-java-alternatives -s java-6-sun

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Yes, I believe this is about default-jre. No, I really don't want to have both Sun and Open JDKs - this is what's the question about - to have one and only and let it be Sun JDK. Is there a way to hack default-jre to point to Sun JRE? –  Ivan Jan 12 '11 at 0:05
Yep, I'll try to rebuild the default-jre package to point to sun-java this evening. Right now I'm @ work. –  Marcos Roriz Junior Jan 12 '11 at 11:46

The .jdk1.6.0_23.jinfo file should be a list of the supplied programs and their paths. There is a descriptive header followed by a blank line. Then a list of the programs in a three field format: entry type (jre/jkd/plugin); program name; and path. You should have some jinfo files you can use to see what the contents should look like. This is likely used by the alternatives mechanism to determine which links to create. The head of my Sun package is.

name=java-6-sun-1.6.0.22
alias=java-6-sun
priority=63
section=non-free

jre ControlPanel /usr/lib/jvm/java-6-sun/jre/bin/ControlPanel
jre java /usr/lib/jvm/java-6-sun/jre/bin/java
jre java_vm /usr/lib/jvm/java-6-sun/jre/bin/java_vm

If you want to override the default Java commands without using the alternatives mechanism put your Java path ahead of /usr/bin in your path.

When doing a manual install, I install Java in /opt. for your install I would have installed in /opt/jdk1.6.0_23. Then I put the path $JAVA_HOME/bin at the start of my PATH variable. EDIT: This is the whole Sun file. Note .java-6-sun.jinfo is a symbolic link to .java-6-sun-1.6.0.22.jinfo. name=java-6-sun-1.6.0.22 alias=java-6-sun priority=63 section=non-free jre ControlPanel /usr/lib/jvm/java-6-sun/jre/bin/ControlPanel jre java /usr/lib/jvm/java-6-sun/jre/bin/java jre java_vm /usr/lib/jvm/java-6-sun/jre/bin/java_vm jre javaws /usr/lib/jvm/java-6-sun/jre/bin/javaws jre jcontrol /usr/lib/jvm/java-6-sun/jre/bin/jcontrol jre keytool /usr/lib/jvm/java-6-sun/jre/bin/keytool jre pack200 /usr/lib/jvm/java-6-sun/jre/bin/pack200 jre policytool /usr/lib/jvm/java-6-sun/jre/bin/policytool jre rmid /usr/lib/jvm/java-6-sun/jre/bin/rmid jre rmiregistry /usr/lib/jvm/java-6-sun/jre/bin/rmiregistry jre unpack200 /usr/lib/jvm/java-6-sun/jre/bin/unpack200 jre orbd /usr/lib/jvm/java-6-sun/jre/bin/orbd jre servertool /usr/lib/jvm/java-6-sun/jre/bin/servertool jre tnameserv /usr/lib/jvm/java-6-sun/jre/bin/tnameserv jre jexec /usr/lib/jvm/java-6-sun/jre/lib/jexec jdk HtmlConverter /usr/lib/jvm/java-6-sun/bin/HtmlConverter jdk appletviewer /usr/lib/jvm/java-6-sun/bin/appletviewer jdk apt /usr/lib/jvm/java-6-sun/bin/apt jdk extcheck /usr/lib/jvm/java-6-sun/bin/extcheck jdk idlj /usr/lib/jvm/java-6-sun/bin/idlj jdk jar /usr/lib/jvm/java-6-sun/bin/jar jdk jarsigner /usr/lib/jvm/java-6-sun/bin/jarsigner jdk javac /usr/lib/jvm/java-6-sun/bin/javac jdk javadoc /usr/lib/jvm/java-6-sun/bin/javadoc jdk javah /usr/lib/jvm/java-6-sun/bin/javah jdk javap /usr/lib/jvm/java-6-sun/bin/javap jdk jconsole /usr/lib/jvm/java-6-sun/bin/jconsole jdk jdb /usr/lib/jvm/java-6-sun/bin/jdb jdk jhat /usr/lib/jvm/java-6-sun/bin/jhat jdk jinfo /usr/lib/jvm/java-6-sun/bin/jinfo jdk jmap /usr/lib/jvm/java-6-sun/bin/jmap jdk jps /usr/lib/jvm/java-6-sun/bin/jps jdk jrunscript /usr/lib/jvm/java-6-sun/bin/jrunscript jdk jsadebugd /usr/lib/jvm/java-6-sun/bin/jsadebugd jdk jstack /usr/lib/jvm/java-6-sun/bin/jstack jdk jstat /usr/lib/jvm/java-6-sun/bin/jstat jdk jstatd /usr/lib/jvm/java-6-sun/bin/jstatd jdk native2ascii /usr/lib/jvm/java-6-sun/bin/native2ascii jdk rmic /usr/lib/jvm/java-6-sun/bin/rmic jdk schemagen /usr/lib/jvm/java-6-sun/bin/schemagen jdk serialver /usr/lib/jvm/java-6-sun/bin/serialver jdk wsgen /usr/lib/jvm/java-6-sun/bin/wsgen jdk wsimport /usr/lib/jvm/java-6-sun/bin/wsimport jdk xjc /usr/lib/jvm/java-6-sun/bin/xjc plugin xulrunner-1.9-javaplugin.so /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so plugin mozilla-javaplugin.so /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so - I don't have any java installed so I don't have anything related to it, nothing installed, no .jinfo files etc. I created the usr/lib/jvm folder myself because I read that that's where it's installed by default, and I'm going to keep it that way. That's why I would like to see the full content of the .jinfo file for the Sun's JDK. – jurchiks Feb 13 '11 at 11:18 I've added the full sun .jinfo file. – BillThor Feb 13 '11 at 15:58 Thanks for that. – jurchiks Feb 14 '11 at 10:35 I added this line to the /etc/environment file: JAVA_HOME="/usr/lib/jvm/jdk1.6.0_23" and added JAVA_HOME/bin to the PATH variable, BUT the OS still doesn't recognise the command java, says it's not installed and offers me gcj and openjdk. Did you check it? echo$JAVA_HOME
echo $PATH  If you don't need it: Deinstall openjdk and gcj in synaptic or with apt-get. apt-get remove gcj apt-get remove openjdk  I would ban java from alternatives then, and do mostly as BillThor suggested, why I gave him an upvote. which javac which java  should point to where you installed java, and where it is found in the PATH. - I don't have gcj or openjdk installed... Just tried the which commands and it prints nothing. Found out that I forgot the$ symbol before the JAVA_HOME variable in PATH, I'll restart now and see how it goes. –  jurchiks Feb 13 '11 at 11:19
Restarted the PC, but the which command still shows nothing. Both JAVA_HOME and PATH variables are correct: echo $JAVA_HOME /usr/lib/jvm/jdk1.6.0_23 echo$PATH $JAVA_HOME/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr‌​/games Where could be the problem? Edit: GOD DAMN IT, why are there no line breaks in comments?? – jurchiks Feb 13 '11 at 11:53 a) restarting the PC shouldn't be required. Reopen the shell should suffice, or mostly relogin as user. b) Look inside the help for formatting in comments. I see echo$PATH $JAVA_HOME/bin:/usr/local/sbin... but in the result$JAVA_HOME must be evaluated - there is something wrong, or your reporting is mistakable. c) Linebreaks: They aren't there, so that we constantly hit ENTER too early, and then the clock ticks, because editing is just for few minutes allowed - I constantly step into that trap. I hate it! :) –  user unknown Feb 13 '11 at 12:38
Well, the JAVA_HOME variable is in the same file (/etc/environment), just in the first line. Maybe it should be somewhere else? It recognises it when I type echo $JAVA_HOME though... – jurchiks Feb 13 '11 at 14:16 My question was: Does echo$PATH print \$JAVA_HOME... or does it print the value for JAVA_HOME, i.e.: /usr/lib/jvm/jdk1.6.0_23 ? –  user unknown Feb 14 '11 at 0:37
1. Open System->Administration-> Synaptic Package Manager and then remove OpenJDK completely.
2. Test version of Java typing java -version in shell (it will display Sun java only)
3. Type sudo update-java-alternatives -l
4. you are done. Now you have only sun java installed and it's setup as default jdk

and it works only if you have two jdk installed and you wanna set sun-java as a default environment

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Delete openjdk and icedtea:

apt-get purge openjdk-\* icedtea-\* icedtea6-\*


deb http://ppa.launchpad.net/webupd8team/java/ubuntu YOUR_UBUNTU_VERSION_HERE main


install Sun/Oracle JRE or JDK:

apt-get install oracle-jdk7-installer
apt-get install oracle-java7-installer

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And after this you are left with no Java at all... The question actually refers to who to replace one with the other, not how to remove OpenJDK from your system. Add a bit more information to your answer, the question cannot be answered only by following these steps. –  Bruno Pereira Apr 18 '12 at 15:25
Thanks. I updated it. –  Fabian Zeindl Apr 18 '12 at 20:12

Using Ubuntu 10.10,it seems you need to mark for removal libaccess-bridge-java first in Synaptic, and then mark openjdk-6-jre-headless.

I ended up with a list to be removed:

ca-certificates-java, icedtea-6-jre-cacao, libaccess-bridge-java, libaccess-bridge-java-jni, openjdk-6-jre, openjdk-6-jre-headless,openjdk-6-jre-lib.

This worked but it left a directory /etc/java-6-openjdk behind with assorted files and subdirectories within, which I isolated in a new directory. There have been no unusual effects, so presumably it is just a leftover remnant.

This left me with the Java I had downloaded directly from the Java website. However, despite having set it as default and creating the link to the Firefox plugins directory, it no longer worked. Installing sun-java6-jre and it's associated packages gsfonts-x11, odbcinst, odbcinst1debian2, sun-java6-bin, and unixodbc, via Synaptic, saw the Java plugin begin working again. Removing the link in the plugins directory and replacing it with the actual libnpjp2.so file did not work. Using a link to the libjavaplugin_oji.so files in either the ns7 or ns7-gcc29 directories in the Java installed through Synaptic did not work either. This suggests to me that to get the latest Java plugin in Firefox one can follow the instructions on the Java website, and that the integrated Linux Java of whichever variety is present is needed to run the downloaded Java, which then relies for it's operation on the files surrounding it once the plugin has been activated. While a full understanding of the code comprising Java and Linux would be required to really solve it's mysteries, perhaps these experiments are helpful in finding the reasons why two Java's may be needed in this case. At least it is possible to remove all Java as well, if anyone finds it useful to do so.

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The thing I do on new Ubuntu 10.10 machines is

• remove openJDK (add sun Java first otherwise a bunch of things will be removed like tomcat, etc)

Then it is fine for me, no more openJDK dependencies

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java-6-sun isn't it the ubuntu-default-package, or is it? –  Fabian Zeindl May 20 '12 at 15:18

The answers given to this question did not work for me. That is, the following failed:

sudo apt-get purge sun-java5-jre sun-java6-font sun-java6-jre


With the error:

Virtual packages like 'sun-java6-jre' can't be removed


1. Open Ubuntu Software Centre.
2. Search for IcedTea.
3. Remove IcedTea Java Plug-in (icedtea-6-jre-cacao), if it is installed.
4. Select OpenJDK Java 7 Runtime.
5. Click Install.

The OpenJDK (IcedTea) is now installed, which should allow you (if you had this error) to continue installing Oracle's JDK without error.

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First: remove openjdk and icedtea plugin.

sudo apt-get remove openjdk* icedtea*


Second: copy the .bin jdk file to /opt or /usr/java and extract it.

sudo cp jdk_1.16.0.bin /usr/java


Third: put a link of the java file to /usr/bin/

ln -s /usr/java/jdk_1.6.0/bin/java /usr/bin/java
ln -s /usr/java/jdk_1.6.0/bin/javac /usr/bin/javac


update the alternatives using update-alternatives

Create a symbolic link to the Java Plugin in the Firefox plugins directory.

Create a symbolic link to the Java Plugin libnpjp2.so file in the Firefox plugins directory:

   cd

<Firefox>/plugins

ln -s

<JRE>/lib/i386/libnpjp2.so .


Hope this helps.

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Didn't you miss a step after cp, and before linking? And: You suggest manual linking, but there are 45 files in java/bin, most of them executable. Would you like to make 25 symbolic links? I would prefer changing the PATH. –  user unknown Feb 13 '11 at 7:48
as far as i know the steps are correct. you can refer to the tutorial on sun(oracle's) java installation page. the above steps worked for me though!. let me know how you get along. –  Ubuntuser Feb 14 '11 at 17:33