Based on http://www.oracle.com/technetwork/java/javase/manual-plugin-install-linux-136395.html
I presume that JAVA_HOME is defined , if not substitute it with real path.
On Ubuntu:
cd /usr/lib/mozilla/plugins
sudo ln -s $JAVA_HOME/jre/lib/amd64/libnpjp2.so .
recheck:
/usr/lib/mozilla/plugins $ ls -la
total 8
drwxr-xr-x 2 root root 4096 May 20 11:57 .
drwxr-xr-x 3 root root 4096 Oct 29 2014 ..
lrwxrwxrwx 1 root root 37 May 13 12:43 flashplugin-alternative.so -> /etc/alternatives/mozilla-flashplugin
lrwxrwxrwx 1 root root 42 May 20 11:57 libnpjp2.so -> /opt/jdk1.8.0_45/jre/lib/amd64/libnpjp2.so
Launch Java app from web and on jnlp usage please select javaws:
ATTENTION: if no javaws is selected - use that window by option "Other ..." to select application at $JAVA_HOME/bin/javaws (example: /opt/jdk1.8.0_45/bin/javaws)
