Frequently asked questions - General

From The Document Foundation Wiki
< Faq‎ | General
Jump to: navigation, search


How to install Java (JRE/JDK) so that LibreOffice could use it?

"Please install a JRE" warning on Windows

Some LibreOffice functions require Java (JRE/JDK). To use them, a supported version of JRE/JDK must be present and configured on the system.

Using Windows

When using Windows, you need to make sure that the architecture of installed LibreOffice matches the architecture of installed JRE. If your Windows is 64-bit, LibreOffice Download page by default offers you a 64-bit LibreOffice installer. It is designated as Windows x86_64⁠Wikipedia logo v3.svg. If you have 32-bit operating system, you will be offered a 32-bit installer (Windows x86⁠Wikipedia logo v3.svg). You may check the architecture of installed LibreOffice in menu Help ▸ About LibreOffice, where the version string looks like "Version: 6.2.1.1 (x64)" for 64-bit version, and "Version: 6.2.1.1" (without "(x64)") for 32-bit version.

"All Java downloads" link

LibreOffice can only use JRE with matching architecture: i.e., 64-bit LibreOffice can only use 64-bit JRE, and 32-bit LibreOffice can only use 32-bit JRE. When you have installed a 64-bit LibreOffice, and 32-bit JRE, LibreOffice would not be able to find and use the JRE, no matter how hard you would try it. This is a common situation, because Java home page (www.java.com) only offers 32-bit JRE by default, regardless which is current operating system architecture. In this case, LibreOffice (of reasonably fresh version) would try to be helpful in its error message, telling you that it needs specific architecture (e.g., 64-bit) of JRE. To find other available downloads, including 64-bit JRE, you need to ignore the Big Red "Agree and Start Free Download" button, and find a small See all Java downloads link below.

Java installer packages typically have this naming scheme:

  • jre-8u201-windows-i586-iftw.exe - 32-bit web-installer;
  • jre-8u201-windows-i586.exe - 32-bit standalone installer;
  • jre-8u201-windows-x64.exe - 64-bit standalone installer.

JREs which are installed into C:\Program Files (x86) (as opposed to C:\Program Files) are 32-bit (unless you manually modified install path during installation), so you may use this information to tell if your JRE is 32-bit or 64-bit.

It is possible to install both 32-bit and 64-bit Java simultaneously on the system; and they don't conflict with each other - so if in doubt, just install both.

Using macOS

On macOS 10.10 and newer, please note that you need to install JDK, not JRE. You may find download links choosing JDK version on this page. On macOS 10.09, neither JRE, nor JDK are found. LibreOffice releases available from Apple App Store don't include Java support at all, because apps distributed in the App Store are not allowed to depend on optional functionality like Java.

See also

Install the right JRE in German FAQ