Run this commands in your console

sudo update-java-alternatives --set java-6-sun
sudo update-alternatives --config java
You usw OpenJDK instead of Suns Java

Thank you very much.
I got this in my terminal:
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| mads@ubuntu:~$ update-java-alternatives --set java-6-sun update-java-alternatives: no root privileges mads@ubuntu:~$ sudo update-java-alternatives --set java-6-sun [sudo] password for mads: update-alternatives: error: no alternatives for HtmlConverter. update-alternatives: error: no alternatives for java-rmi.cgi. update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/appletviewer update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/apt update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/extcheck update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/HtmlConverter update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/idlj update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jarsigner update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jar update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/javac update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/javadoc update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/javah update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/javap update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/java-rmi.cgi update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jconsole update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jdb update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jhat update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jinfo update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jmap update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jps update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jrunscript update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jsadebugd update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jstack update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jstatd update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/jstat update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/native2ascii update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/rmic update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/schemagen update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/serialver update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/wsgen update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/wsimport update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/java-6-sun/bin/xjc mads@ubuntu:~$ sudo update-alternatives --config java There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Prioritet Status ------------------------------------------------------------ 0 /usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 auto mode 1 /usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 manual mode * 2 /usr/lib/jvm/java-6-sun/jre/bin/java 63 manual mode
Press enter to keep the current choice[*], or type selection number: 2 mads@ubuntu:~$ |
And I still get the error upon compiling.
I'm fairly new to ubuntu - your help is greatly appriciated.
I could just uninstall openJDK but then I lose netbeans aswell

Should I rely on eclipse then instead?