This page is part of the Confluence Installation Guide.
(tick) Mac users can ignore these instructions, because OS X comes with a Java Development Kit.

Confluence requires Java 5 (JDK 1.5) or later

Confluence needs JDK 1.5 or newer to be installed on your computer.

  • A JRE (Java Runtime Environment) is not enough.
  • JDK 6 is the preferred platform, because it is faster and more reliable.
  • JDK 1.5 is fine.
  • JDK 1.4 is not supported in Confluence 2.9 or later.

OpenJDK is currently not supported, jira issue exists already here

  1. If you are not sure whether you have JDK installed correctly, please confirm by doing the following:
    • Open a command prompt.
      • On Windows: Open your 'Start' menu and select 'Run', then type cmd and click 'OK'.
    • Type the following in the command prompt and then press Enter:
      • On Windows: echo %JAVA_HOME%
      • On Unix: echo $JAVA_HOME
    • View the result:
      • If a line is displayed such as C:\Progra~1\Java\jdk1.5.0_06, please check that the letters just before the final numbers are 'jdk'. If you see those letters, the JDK is installed.
      • If nothing is displayed, or you do not see 'jdk' plus some numbers, the JDK is not installed.
  2. If you have installed a non-Sun JDK and you want to use SSL then you need to install the Sun JSSE package.
  3. If you need to install the JDK, follow these instructions:
    • Go to the Java Sun download page.
    • Download the version entitled 'JDK 6 Update XX', where 'XX' stands for some number. (Sun will provide the latest version on that page.)
    • When the download has finished, run the Java installer. At one point, you will be asked to choose a directory to install to. Copy or write this directory down for use later.
  4. On Windows: Please follow these instructions to set your JAVA_HOME environment variable to the directory you where you have just installed the JDK. By default, this directory is under C:\Program Files\Java.

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