switching java-versions in ubuntu
to switch between 2 installed versions of the jdk in ubuntu 2 commands are needed:
sudo update-alternatives --config java
is used to choose the java version
sudo update-alternatives --config javac
is used to change the javac version
See also:
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Using the terasic DE0-Nano on ubuntu
File Upload in Servlet 3.0
OutOfIdeasException
Deploying Processing apps using WebStart
Thanks. Helped