Home > Java, Mac administration, Mac OS X > Oracle’s Java 8 Update 66

Oracle’s Java 8 Update 66

Following closely on the heels of Oracle’s release of Java 8 Update 65, Oracle has released Java 8 Update 66. This update is also using Oracle’s install application.

Screen Shot 2015 10 21 at 8 57 05 AM

What’s the difference between Update 65 and Update 66? Update 65 is a Critical Patch Update (CPU), which contains both fixes to security vulnerabilities and critical bug fixes. Update 66 is a Patch Set Update (PSU), which means it contains all the fixes in the corresponding CPU, plus additional fixes to non-critical problems. For more details on the differences between CPU and PSU updates, please see the link below:


So the short version is that Update 65 has “critical bug fixes” and Update 66 has “Update 65’s bug fixes, plus more bug fixes.”

You can get Oracle’s Java 8 Update 66 from the link below:


For more details on Java 8 Update 66, see below the jump.

While the Oracle install application is not a standard installer package, it appears that Oracle had stored an installer package for Java 8 within the install application at the following location:


Screen Shot 2015 10 21 at 10 24 10 AM

Once the JavaAppletPlugin installer package is copied out of the install application, it can be deployed like previous Java updates’ installer packages.


Oracle’s Java 8 Update 66 install application has the following behavior:

This application will prompt for admin privileges before fully launching.

Screen Shot 2015 10 21 at 10 16 36 AM 

Once you provide admin authentication, the application launches.

Screen Shot 2015 10 21 at 10 16 45 AM

It will then tell you how many devices run Java while it installs.

Screen Shot 2015 10 21 at 10 16 55 AM

Once complete, it’ll tell you what it’s installed.

Screen Shot 2015 10 21 at 10 16 57 AM

Unlike previous incarnations of the install application, Java 8 Update 65‘s and Java 8 Update 66‘s install applications do not appear to try to install any browser toolbars. To verify this behavior, I ran the MacJREInstaller binary which the Oracle Java application is using to actually install the Java browser plug-in.

Screen Shot 2015 10 21 at 10 24 18 AM

While I observed that Java 8 Update 66’s MacJREInstaller continued to check with Oracle and report which country it was being installed in, I did not see anything being downloaded from Oracle. This behavior matches what I observed with Java 8 Update 65. For those interested, I’ve posted the output below.

  1. November 23, 2015 at 3:19 am

    When I installed it is DID ask me to make yahoo.com my homepage in FIrefox, and use it as my default search engine, FYI.

  2. Ron Hathcock
    November 24, 2015 at 6:33 am

    It asked me about yahoo.com, then went away without telling me Java was updated. When I checked its status, it acted like the update never happened.

  3. Jim
    December 1, 2015 at 1:52 pm

    PSU 66 failed multiple times to install. Whayt risk is there if this PSU update fails to complete installaiton?

  4. Lee
    January 3, 2016 at 6:20 pm

    fwiw, pasting a copy of the JavaAppletPlugin installer package into my applications folder and then installing the update did NOT force me to allow Java to install some whizbang “helper tool.” Instead, I got a clean(er) install of only the upgrade, no questions about changing my start page either.

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