Frequently asked questions - General

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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

x86 or x64 architecture?

Do not mistake 'x64' and 'x86' architectures: when using Windows, you need to make sure that the architecture of installed LibreOffice matches the architecture of installed JRE.

  • If you have 32-bit operating system, you will be offered a 32-bit installer (Windows (32-bit)Wikipedia logo v3.svg).

You may check the architecture of installed LibreOffice in menu Help ▸ About LibreOffice, where the version string looks like "Version: 6.4.5.2 (x64)" for 64-bit version, and "Version: 6.4.5.2 (x86)" for 32-bit version.

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. Take care that you download from the Java home page (www.java.com) the right architecture. In this case, LibreOffice (of reasonably fresh version) would try to be helpful in its "JRE Required" error message, telling you that it needs specific architecture (e.g., 64-bit) of JRE.

Download links

To find other available downloads, including 64-bit JRE, you need to ignore the Big green "Download Java" button, and find a small See all Java 8 Downloads for Desktop users link below.

Do not use the big button, use the link "See all Java 8 Downloads for Desktop users". (click to enlarge image)


Then, in the manual download page, you have to choose the right version. (If you are in doubt, you can install both.)

Choose the correct direct downlad link, depending of your LibreOffice installation.

Package names

Java installer packages typically have this naming scheme:

  • jre-8u201-windows-i586-iftw.exe or JavaSetup8u261.exe - 32-bit web-installer;
  • jre-8u201-windows-i586.exe - 32-bit standalone installer;
  • jre-8u201-windows-x64.exe - 64-bit standalone installer.

Thus, be aware that 'standard' build, with a naming scheme like JavaSetup8u341.exe will NOT work with LibreOffice. This is why you have to use the manual download link.

How to control what JRE version in installed

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.

Launching Java Control Panel ("Configure Java" available in Windows Start menu), and clicking "View" button on "Java" tab, opens Java Runtime Environment Settings window with Architecture column allowing to see if installed instances are 32-bit (x86) or 64-bit (x86_64).

JavaControlPanel.png

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. Note that Apple M1 is an Arm 64 architecture. 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.

Java vendor support

Since v.6.1.6 and 6.2.4, LibreOffice supports a wide variety of third-party JRE vendors in addition to Oracle, e.g. Temurin and Amazon Corretto.

Java version support

  • For LibreOffice prior to v.6.3, minimal supported Java version is 5 (clarification needed about older support history).
  • For LibreOffice v.6.3, minimal supported Java version is 6 (see Release Notes).
  • For LibreOffice v.6.4, minimal supported Java version is 8 (see mailing list archive and commit).

See also

Install the right JRE HowTo