Installing JDK 7 on Mac OS X Yosemite 10.10 developer previews

Oracle's JDK 7 installer for the Mac somehow thinks that OS X Yosemite's 10.10 version number is an unsupported version. There's a simple trick to fool the installer by giving it a version number that it expects. Open a Terminal window and edit the file /System/Library/CoreServices/SystemVersion.plist as root/Administrator. If you are familiar with vi, simply run sudo vi /System/Library/CoreServices/SystemVersion.plist. The file should look something like this:


<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

            <key>ProductBuildVersion</key>

            <string>14A329f</string>

            <key>ProductCopyright</key>

            <string>1983-2014 Apple Inc.</string>

            <key>ProductName</key>

            <string>Mac OS X</string>

            <key>ProductUserVisibleVersion</key>

            <string>10.10</string>

            <key>ProductVersion</key>

            <string>10.10</string>

</dict>

</plist>

Edit the ProductVersion to read 10.9 and save the file. Now download the JDK 7 installer and run it. It should no longer complain about the OS X version. Be sure to restore the ProductVersion to 10.10 once the installer completes.

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