Problems with VNC java console on Ubuntu Natty 11.04

[Ninjix]

I'm having problems connecting to guests using the Java VNC console on my Ubuntu 11.04 workstation. The VNC client window opens but the CPU goes to 100% for one of my cores and the VNC windows becomes unresponsive. This is happening on Firefox 4 and Google Chrome leading me to suspect something is up with 11.04's java-6-openjdk or the icedtea-plugin.

Anyone experiencing this problem on Ubuntu 11.04 x64?

I'm able to connect without any problems using a standalone VNC client and the "nc -l -p 5900 -c qm vncproxy" method on the same workstation.

 

[tom]

did you try the recommended sun-java6-plugin?

 

[tom]

works here, at least in my vmware 11.04 installation (without unity).

 

[xxyonixx]

Hi Ninjix,

I had the same problem as you.

For me the issue was IcedTea v6b22-1.10.1-0ubuntu1 refused to receive the keyboard's input to the VNC console all the time, except for the first time trying after a restart to Firefox.

I decided to try out the recommended Sun's Java plugin (named sun-java6-plugin in Ubuntu Natty).
After installation of the package, I entered the Firefox Add-ons window and Sun's Java plugin wasn't on the list of installed plugins, but IcedTea was.

In order to represent Java plugin for Firefox, the symbolic link /usr/lib/mozilla/plugins/libjavaplugin.so links to /etc/alternatives/mozilla-javaplugin.so that links to /usr/lib/jvm/java-6-openjdk/jre/lib/i386/IcedTeaPlugin.so .
Wanting to change Firefox Java plugin representation to use Sun's version, I deleted the /usr/lib/mozilla/plugins/libjavaplugin.so file and recreated it linking to /usr/lib/mozilla/plugins/libjavaplugin.so .
That solved the problem for me.

Good luck,
Yoni.

 

[tpeelen]

Hi Yoni,

Thanks for your post. However I believe the last entry to which you linked is a typo (circular link). Could you provide me with the correct link? If you happen to know the correct link in an amd64 configuration I'd be double pleased, but otherwise I will find it out myself.

Regards, Tom.

 

[xxyonixx]

A typo indeed

/usr/lib/mozilla/plugins/libjavaplugin.so -> /usr/lib/jvm/java-6-sun-1.6.0.24/jre/lib/i386/libnpjp2.so
I believe the i386 part may differ in your installation.

Yoni.

 

[tpeelen]

Hi Yoni,

Thanks! Meanwhile I've tried completely removing IcedTea (and the not-working Sun-java) and re-installing Sun-java. This worked for me also!

Tom.

 

[xxyonixx]

One of the latest Ubuntu updates caused the previous configuration of Firefox using IcedTea plugin to reappear.

In order not to be influenced by apt updates, I replaced this link:
/usr/lib/mozilla/plugins/libjavaplugin.so -> /usr/lib/jvm/java-6-sun-1.6.0.24/jre/lib/i386/libnpjp2.so
with these series of links:
/usr/lib/mozilla/plugins/libjavaplugin.so -> /etc/alternatives/mozilla-javaplugin.so -> /usr/lib/jvm/java-6-sun-1.6.0.24/jre/lib/i386/libnpjp2.so

I believe this action will solve the problem permanently.
Yoni.