java and libreoffice crashed after languagetool tries checking grammar

[Waleed Hamra]

i installed the langauge tool extension to libreoffice (http://www.languagetool.org/), which is supposed to check grammar and writing style. the extension is written in java apparently.
i started libreoffice in a terminal to see crash output, attached along the bug report.
steps to reproduce, after installing extension, restart libreoffice, type any grammatically wrong sentence "i are an nut", and check spelling (F7) few times, libreoffice usually crashes from first or second checking.

[Waleed Hamra (w-hamra1987)]

willy@Hamra:~$ java -version
java version "1.6.0_23"
OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre11-0ubuntu1.11.10)
OpenJDK Client VM (build 20.0-b11, mixed mode, sharing)
willy@Hamra:~$ apt-cache policy libreoffice
libreoffice:
  Installed: 1:3.4.4-0ubuntu1
  Candidate: 1:3.4.4-0ubuntu1
  Version table:
 *** 1:3.4.4-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ oneiric-updates/main i386 Packages
        100 /var/lib/dpkg/status
     1:3.4.3-3ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ oneiric/main i386 Packages
willy@Hamra:~$ uname -a
Linux Hamra 2.6.38-12-generic #51-Ubuntu SMP Wed Sep 28 14:25:20 UTC 2011 i686 i686 i386 GNU/Linux
willy@Hamra:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.10
Release: 11.10
Codename: oneiric
willy@Hamra:~$