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I know java npapi plugin is discontinued both by firefox and chrome, but I really need java to work.

So, installed Mozilla Build of Firefox, and kept it on a earlier version (51.0.1). Java has been working as expected. Java is Oracle java (Java(TM) Plug-in 11.131.2), with libnpjp2.so symlinked the usual way for many years;

Last week I updated to the new stable kernel 4.10.0-24 (no changes made to any configs) and the Java plugin just refuses to work.

If I boot with the previous kernel 4.10.0-22, the plugin works fine.

I cannot see any errors anywhere, although i was running firefox from konsole and looking at the output there.

closed as off-topic by Fabby, Kaz Wolfe, Elder Geek, waltinator, Kevin Bowen Jul 10 '17 at 2:50

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This describes a problem that can't be reproduced that seemingly went away on its own or was only relevant to a very specific period of time. It's off-topic as it's unlikely to help future readers." – Fabby, Kaz Wolfe, Elder Geek, waltinator, Kevin Bowen
If this question can be reworded to fit the rules in the help center, please edit the question.

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    Could you please add a little more detail? What exactly did you do, what did you want to achieve and what happened instead? Did you encounter any warning or error messages? Please reproduce them in their entirety in your question. You can select, copy and paste terminal content and most dialogue messages in Ubuntu. (see How do I ask a good question?) – David Foerster Jun 22 '17 at 18:31
  • not really. can't find any errors. just won't work on the latest kernel. – Artur Correia Jun 22 '17 at 21:37
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    If you can't "really" add more detail then we don't "really" know what you were trying to do and we can't "really" answer your question. How did you install Java and its browser plug-in? How did you convince Firefox to enable it even though it's black-listed? Which Java applet on which web site did you try to run? – David Foerster Jun 22 '17 at 21:39
  • ah, ok i'm running "mozilla build of firefox", at version 51.0.1. installed it via a deb package from there. – Artur Correia Jun 22 '17 at 21:46
  • sorry for that, "enter" is cutting my answers short. so, java is oracle java, symlinked the usual way for many years; if i run firefox with the new stable kernel 4.10.0-24, the plugin refuses to work; if if reboot with previous kernel (no changes made) 4.10.0-22, the plugin works fine; i cannot see any errors anywhere, although i was running firefox from konsole and looking at the output there ... thanks – Artur Correia Jun 22 '17 at 21:49
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Just a quick update to let everyone know that the issue is fixed on kernel 4.10.0-26.

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I reported the same issue here with some details https://unix.stackexchange.com/questions/372559/java-plugin-crash-on-ubuntu-16-04-firefox-esr-52-2-0

Also coincidentally Eclipse seems to have problem recently where a bug report for the Linux kernel is referred Eclipse Crashes with Linux Kernel 4.4.0-81-generic

The life of the Java plugin is probably at its very end, but some will have problems where it is actually still in use.

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