unable to install languagetool extention 2.2 - fails with java errors

Tried with openjdk-6-jre and openjdk-7-jre (default-jre), both gives same error.

(com.sun.star.uno.RuntimeException) { { Message = "[jni_uno bridge error] UNO calling Java method writeRegistryInfo: non-UNO exception occurred: java.lang.NoClassDefFoundError: com/sun/star/task/XJobExecutor\X000ajava stack trace:\X000ajava.lang.NoClassDefFoundError: com/sun/star/task/XJobExecutor\X000a\X0009at java.lang.ClassLoader.defineClass1(Native Method)\X000a\X0009at java.lang.ClassLoader.defineClass(ClassLoader.java:634)\X000a\X0009at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)\X000a\X0009at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)\X000a\X0009at java.net.URLClassLoader.access$000(URLClassLoader.java:73)\X000a\X0009at java.net.URLClassLoader$1.run(URLClassLoader.java:212)\X000a\X0009at java.security.AccessController.doPrivileged(Native Method)\X000a\X0009at java.net.URLClassLoader.findClass(URLClassLoader.java:205)\X000a\X0009at java.lang.ClassLoader.loadClass(ClassLoader.java:321)\X000a\X0009at java.lang.ClassLoader.loadClass(ClassLoader.java:314)\X000a\X0009at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:615)\X000a\X0009at java.lang.ClassLoader.loadClass(ClassLoader.java:266)\X000a\X0009at com.sun.star.comp.loader.RegistrationClassFinder.find(RegistrationClassFinder.java:55)\X000a\X0009at com.sun.star.comp.loader.JavaLoader.writeRegistryInfo(JavaLoader.java:399)\X000aCaused by: java.lang.ClassNotFoundException: com.sun.star.task.XJobExecutor\X000a\X0009at java.net.URLClassLoader$1.run(URLClassLoader.java:217)\X000a\X0009at java.security.AccessController.doPrivileged(Native Method)\X000a\X0009at java.net.URLClassLoader.findClass(URLClassLoader.java:205)\X000a\X0009at java.lang.ClassLoader.loadClass(ClassLoader.java:321)\X000a\X0009at java.lang.ClassLoader.loadClass(ClassLoader.java:266)\X000a\X0009... 14 more\X000a", Context = (com.sun.star.uno.XInterface) @0 } }

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: libreoffice-writer 1:4.0.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2
Uname: Linux 3.8.0-26-generic i686
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: i386
Date: Wed Jul 17 12:41:54 2013
InstallationDate: Installed on 2012-11-30 (228 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
MarkForUpload: True
SourcePackage: libreoffice
UpgradeStatus: Upgraded to raring on 2013-07-16 (0 days ago)