- Make sure Java 8 or later from Oracle
is installed on your system. If you use the 32-bit version of LibreOffice/OpenOffice.org, you will also
need to use the 32-bit version of Java (same for the 64-bit version).
Java versions which are not from Oracle may not work. If you're using an
old version of Java you'll see a confusing error message like this.
- If you get an error that says Invalid memory access, make sure LanguageTool is installed in a path
that has no special characters (use a-z, A-Z and 0-9 only).
- If installation of LanguageTool in LibreOffice/OpenOffice didn't throw an error but you are not sure if it
actually works, please load this document and follow the instructions in it.
- If you see different results locally and on languagetool.org, that's for two reasons:
- We usually run the latest version on languagetool.org which might have more rules than the latest release version.
- For English, German, French, Spanish: We have some additional rules on languagetool.org that require large data
sets not part of the download version (technical details).
- For Mac users: LanguageTool requires Java 8 or later, which is available for the Mac only as a 64 bit version.
You need the 64-bit version of LibreOffice 4.2 or later in order to use LanguageTool on a Mac
and you also need to have 'Java for OS X' installed,
additionally to Java 8 (Source: #74877).
Older versions of LibreOffice and OpenOffice are only available in 32 bit, leading to an incompatibility so that LanguageTool
cannot be used with these versions as a LibreOffice/OpenOffice add-on on the Mac. The only known workaround for these older versions is to use
LanguageTool 2.2, which is still available from the download archive, for which a 32 bit version
of Java 6 still exists. LanguageTool 2.2 also works with Java 6.
- LibreOffice comes with its own integrated grammar checker (LightProof) which disables LanguageTool for
English and Russian.
Use Options -> Language Settings -> Writing aids -> Edit... to disable LightProof and enable LanguageTool for the language
you are working with to make LanguageTool work.
- Make sure Java 8 or later from Oracle is selected in LibreOffice (Tools -> Options -> Advanced) or
OpenOffice.org (Tools -> Options -> Java). For Mac users: LibreOffice (Preferences -> LibreOffice -> Advanced).
- Did you restart LibreOffice/OpenOffice.org - including the QuickStarter - after installation of LanguageTool? This is required,
even though there is no dialog saying so. (#46279)
- If LanguageTool doesn't start and you see no error message, please
check if the extension is enabled in the Extension manager
(under Tools -> Extension Manager).
Common Problems with LibreOffice/OpenOffice.org Integration
- Note that if you have a 32-bit version of LibreOffice/OpenOffice, you will also need a 32-bit version of Java - LanguageTool will not
work otherwise. Apache OpenOffice doesn't provide official 64-bit versions for Windows and Mac yet, so you will need a 32-bit Java
on Windows and Mac.
- If you get "Could not create Java implementation loader", please work through
Note: if you have this problem on 64-bit Windows,
it may be caused by a 64-bit version of Java. Apache OpenOffice on Windows is only built as a 32-bit application
and will not work with a 64-bit Java. You need to use a 32-bit build of Java for Windows.
(OOo bug #118346)
- On Ubuntu, install the libreoffice-java-common or openoffice.org-java-common package.
One problem solved by this is getting a long error message with "NoClassDefFoundError" during installation
- On Ubuntu, if you get a message similar to Exception in thread "Thread-402" java.awt.HeadlessException in LibreOffice/OpenOffice,
see this stackoverflow answer.
Note that the message might not appear in a dialog but only on the command line, so you might want to start LibreOffice/OpenOffice from a terminal window.
- If you get "This media-type is not supported: application/vnd.sun.star.package-bundle2.0.00" during installation, please consider
resetting your OpenOffice user profile.
- If you get Failed to load rules for language ... Caused by java.lang.ClassNotFoundException: Loading rules failed: Duplicate class definition:
For some reason LanguageTool is installed twice as an extension in OpenOffice.org. You can try deleting the directories listed
in the error message after making a backup. (The directories to be deleted have random names like "EE31.tmp_" or similar - exit OpenOffice.org
before deleting anything).
- The menu items in LibreOffice/OpenOffice.org get mixed up when both After the Deadline
and LanguageTool are installed. The macro mentioned here
might help you. This issue is tracked as ticket #215 at After the Deadline.
- If you start LibreOffice/OpenOffice from the command line and you get a NoClassDefFoundError, make
sure you're not starting LibreOffice/OpenOffice from the LanguageTool installation directory.
- We have received reports from people that a re-installation of LanguageTool in LibreOffice/OpenOffice might be needed
to make it work after the other issues have been resolved.
- If you are using an older version of LanguageTool and/or OpenOffice.org, these issues may affect you:
- Freeze on startup: for some people, LanguageTool freezes LibreOffice or OpenOffice.org on startup for seconds to minutes.
This bug has been fixed in LibreOffice 3.5.4 and Apache OpenOffice 3.4.1 - all older versions are affected
by this, so we strongly recommend to use at least these releases. Bug report.
- Users of LanguageTool 2.9: If you experience osl::Thread::Create failed errors, please
update to LanguageTool 2.9.1 or later (#90740)
Still need Help?
If LanguageTool still doesn't work properly for you, please post to the forum describing the problem
and letting us know which version of LanguageTool, LibreOffice/OpenOffice.org and which operating system you are using.