How to repair Java in Ubuntu after trying to switch to Java 6 using update-java-alternatives


HOME ยป Java

I tried to switch from Java 5 to Java 6 using the
"update-java-alternatives" command like explained on this page:
https://help.ubuntu.com/community/Java


But afterwards I
get the following error when I tried to execute java:

/>root@webserver:~# java
Error occurred during
initialization of VM
Could not reserve enough space for object
heap
Could not create the Java virtual machine.
/>

I also tried to reinstall the java binaries using "apt-get" but I
didn't succeed reinstalling it. I would like to post the "apt-get"
errors, but unfortunately I don't know how to print out the error
messages in English and not

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Health
I have had to install a jre other than sun's. (IBM jre) The only
installation was from a .rpm
Everything is installed and working
(semi) fine.
When I add
class="bbcode_description">PHP Code:
class="bbcode_code">export PATH=/opt/ibm/java-i386-60/jre/bin:$PATH  />
to my ~/.bashrc I can run those IBM jars
fine.
class="bbcode_description">Code:
java
-version
shows the correct java version (IBM version) />But the applications that need to run those jars are running unde
Ubuntu
Yesterday, I ran the following command in order to allow Juniper
NetConnect VPN software to run on my computer:
class="bbcode_container"> class="bbcode_description">Code:
sudo
update-java-alternatives --plugin--verbose --set
ia32-java-6-sun
And apparently, this screwed up, at the
very least, my Eclipse IDE. The log gives the following error: />
class="bbcode_description">Code:
class="bbcode_code">!SESSION 2009-10-26 09:42:37.081
----------------------------------------------- />eclipse.buildId=M20090917-0800
java.version=1.6.0_15 />java.vendor=
Ubuntu
I need to install an older version of java (Java 1.5) in my ubuntu
machine, and make it default java VM in spite of my current
installation.
This is what results from executing
update-alternatives:
~$ update-alternatives --config java />There is only one alternative in link group java:
/usr/lib/jvm/java-6-openjdk/jre/bin/java
Nothing to configure. />I am no sure what my next step should be. The worse is that I can
find no repository or anything similar in the internet that provides a
Java 1.5 VM. I am addicted to use "apt-get install" for
everything, so I am having a hard time understanding the process. />I suppose
Ubuntu
Hello, I'm trying to install Oracle JDK 1.6.0_30 on Ubuntu Server
11.10. OpenJDK 6 and OpenJDK 7 are already installed, and I'm setting
up OracleJDK using update-alternatives.
I've done this with no
problems on my Ubuntu Desktop 11.10 workstation, but the same process
is resulting in this error on the server:
class="bbcode_container"> class="bbcode_description">Code:
class="bbcode_code">update-alternatives: error: alternative javac
can't be a slave of java: it is a master alternative.The
setup process is:
1. Download, extract, and copy the extracted
jdk1.6.0_30 to usr/lib/jvm/jdk1.6.0_30.
2. Setup
Ubuntu
class="bbcode_description">Code:
class="bbcode_code">root@opus:~# sudo update-alternatives --install
"/usr/share/java" "java"
"/usr/share/java/jdk1.7.0/bin/java" 1 />update-alternatives: warning: forcing reinstallation of alternative
/usr/share/java/jdk1.7.0/bin/java because link group java is
broken.
update-alternatives: warning: not replacing
/usr/share/java with a link.
Please help
Ubuntu

On Ubuntu 12.04 LTS I have installed Sun's JDK7, Eclipse, and the
Arduino IDE. I want the Arduino to use OpenJDK 6 and want Eclipse to
use Sun's JDK 7.



From my understanding I need to manually choose which Java to use
before running each application. This led me to the
update-java-alternatives -l command. When I run this I
only see the following:



java-1.6.0-openjdk-amd64 1061
/usr/lib/jvm/java-1.6.0-openjdk-amd64


but when I run 'update-alternatives --config java' I see the
following:



*0  /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java   auto
mode
1 /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java manual mode
2 /usr/lib/jvm/jdk1.7.0/bin/java manual mode
3 /usr/lib/jvm/jre1.7.0/bin/java manual mode


I don't understand why the update-java-alternatives doesn't display
the same 3 options. I also don't understand how to switch between
OpenJDK6 and JDK7. How I can go about using the OpenJDK6 for Arduino
development and Sun JDK7 for Eclipse/Android development?

Ubuntu

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