hello

Recently i reinstalled ubuntu on my laptop & when i try to install netbeans
on it, it's installer says compatible JDK not found but i had installed JDK
1.7.0_02 on it & i followed these commands

root@S13:/home/nika/Downloads# update-alternatives --config javac
update-alternatives: error: no alternatives for javac.
root@S13:/home/nika/Downloads# update-alternatives --install /usr/bin/javac
javac /usr/lib/jvm/jdk1.7.0_02/bin/javac 1
update-alternatives: using /usr/lib/jvm/jdk1.7.0_02/bin/javac to provide
/usr/bin/javac (javac) in auto mode.

but when i  tried javac command it gives following error

root@S13:/home/nika/Downloads# javac
bash: /usr/bin/javac: Permission denied

so i remove it using

root@S13:/home/nika/Downloads# update-alternatives --remove-all javac


can i get some help?

Regards
Navdeep Singh
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