Java crashes in Mozilla Firefox

Ian Malone ibmalone at
Wed Oct 12 08:31:50 UTC 2011

On 10 October 2011 10:57, Per Anton Rønning <pa-ronn at> wrote:
> Ian Malone wrote:
>> On 8 October 2011 09:05, Heinz Diehl <htd at> wrote:
>>> On 08.10.2011, Per Anton Rønning wrote:
>>>> Error occurred during initialization of VM
>>>> java/lang/NoClassDefFoundError: java/lang/Object
>>>> Ring a bell?
>>> Unfortunately not. Does this one help?

So it looks like there are three Java here:

>> 1. Making sure that the symlinked plugin really is symlinked and
>> pointing to the libnpjp2 in the installed java directory
>> (/usr/java/jre1.6.0_27/lib/i386/ ?) and is not a copy or
>> pointing to a copy.
> Hi Ian:
> the in this location is:
> -rwxr-xr-x 1 root root  77510 2011-07-19 10:57
> so it should be an executable, not a symlink pointing to other locations.

This means the Java you're using with that plugin is
/usr/java/jre1.6.0_27, which should be a fairly recent Sun Java.

>> 2. Checking 'which java' reports 'bin' in the same install directory
>> (it would be /usr/java/jre1.6.0_27/bin/java assuming the location from
>> #1).
> which java or which -a java reports:
> /usr/bin/java
> but this is not what you specify here, it is higher up in the directory
> hierarchy. Maybe my installation has a different structure?

It may not be the final location (could be a symlink), but...

>> 3. Checking 'java -version' works.
> reports:
> $java -version
> java version "1.5.0"
> gij (GNU libgcj) version 4.3.0 20080428 (Red Hat 4.3.0-8)

Indicates the Java in your path is GCJ (Gnu Java if you like).

> this. I still keep firefox-3.5.4, and I found a pervious plugin that I
> symlink from its plugins directory, which looks like this:
> lrwxrwxrwx 1 root root    76 2011-10-09 12:21 ->
> /usr/lib/jvm/java-1.6.0-sun-
> -rwxr-xr-x 1 root root 15824 2009-10-16 18:02
> [par at localhost plugins]$

This is, I think, an earlier and different install of Sun Java to the
one above. Which would explain why it may not have the new-style
mozilla plugin. Whatever you do don't remove this one as it's the one
you're relying on for banking.

> I also discovered something else:
> The java in /usr/java/jre1.6.0_27/bin/ responded like this when I tried
> to start it:
> [par at localhost bin]$ ./java
> Error occurred during initialization of VM
> java/lang/NoClassDefFoundError: java/lang/Object

Indicates the /usr/java/jre1.6.0_27 Java is broken. I think getting
the icedtea plugin working as Deepak suggests is probably your best
bet. This actually means you'll have 4 Java installed, but that
shouldn't be a problem. Next best solution is retry the installation
for /usr/java/jre1.6.0_27 and make sure you didn't miss anything out,
the plugin is failing because the Java in that location is broken.


More information about the users mailing list