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I am using ubuntu 14.10 and i installed jdk8 via apt-get install openjdk-8-jdk:i386. Using update-alternatives, I have made java 8 as the default one.

Now, when i checked java on firefox using this link, it showed java plugin is not working on browser.

To fix this, I tried to copy libnpjp2.so from /usr/lib/jvm/java-8-openjdk-i386/lib/i386 to ~/.mozilla/plugins folder.

But i can see, the plugin so file is missing inside the jvm libs folder

How can i make java plugin work in firefox with openjdk-8?

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  • Is there some reason you are using 32 bit java (on a supposedly 64 bit machine)?
    – Wolfer
    Sep 30, 2015 at 13:53
  • 1
    Cisco's webex works only on 32 bit firefox which needs 32 bit java
    – Madhavan
    Sep 30, 2015 at 14:35
  • The what. Java is a language designed to be independent from the running machine's architecture by using a VM. That's why any machine (or smartphone) can run a jar file if they have a java VM installed. So the 32 bits are only relevant to the host OS. I'd recommend using a java VM that actually runs on your machine before trying to combine it with Firefox.
    – Wolfer
    Sep 30, 2015 at 14:53
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    @Wolfer, you're right. In theory. I have no idea why, but audio doesn't work with Webex on 32 bit systems.
    – r1pp3rj4ck
    Oct 27, 2015 at 8:43

1 Answer 1

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You need to install the icedtea-plugin:i386, it will create 

/usr/lib/jvm/java-8-openjdk-i386/lib/i386/IcedTeaPlugin.so

which you can symlink to 

~/.mozilla/plugins/libnpjp2.so
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  • 2
    $ sudo apt-get install icedtea-plugin
    – Yu Jiaao
    Jun 14, 2016 at 4:40
  • @YuJiaao I think it's sudo apt-get install icedtea-plugin:i386 on 64 bit systems.
    – r1pp3rj4ck
    Aug 29, 2016 at 12:11
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    I had to add ln -s /usr/lib/jvm/java-8-openjdk-i386/jre/lib/i386/IcedTeaPlugin.so libnpjp2.so
    – psv
    Jan 4, 2017 at 14:06
  • There is no need to link with libnpjp2.so, I ran ln -s /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so . and activated IcedTea plugin by visiting java.com/en/download/installed8.jsp
    – Niloct
    Jan 10, 2017 at 16:00
  • if you install java manually, you also need to make sure that the javaws binary points to the correct jdk version. in my case, i had an alternative configured that needed proper linking.
    – thrau
    Aug 9, 2017 at 11:16

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