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

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I tried to switch from Java 5 to Java 6 using the "update-java-alternatives" command like explained on this page:

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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[ubuntu] change to java NOT on update-java-alternatives list
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
PHP Code:
export PATH=/opt/ibm/java-i386-60/jre/bin:$PATH 
to my ~/.bashrc I can run those IBM jars fine.
java -version
shows the correct java version (IBM version)
But the applications that need to run those jars are running unde
[ubuntu] update-java-alternatives broke my Eclipse! PLEASE HELP!!
Yesterday, I ran the following command in order to allow Juniper NetConnect VPN software to run on my computer:
sudo update-java-alternatives --plugin--verbose --set ia32-java-6-sun
And apparently, this screwed up, at the very least, my Eclipse IDE. The log gives the following error:
!SESSION 2009-10-26 09:42:37.081 -----------------------------------------------
[ubuntu] update-alternatives for java
I need to install an older version of java (Java 1.5) in my ubuntu machine, and make it default java VM in spite of my current installation.
This is what results from executing update-alternatives:
~$ 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] update-alternatives: error: alternative javac can't be a slave of java...
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:
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] update-alternatives problem -installing java on Ubuntu - "link group java is broken"
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.
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Please help
update-java-alternatives vs update-alternatives --config java

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

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

*0  /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java   auto
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?

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