I do not have Java on my MacBook Pro and I use it about 16 hours per and day do not have any lapses of functionality.
Probably do not update and just remove it.
I assume I must have it, since I got that update message, but I don't know why or how it got on my computer. When I do a Finder Find I do show JavaAppletPlugins dmgs from 2012, 2013, and 2015 sitting in my downloads folder. I may have downloaded them, but I doubt I installed any. How do I remove it? i.e. how do I tell if it is installed? Update: I just found a Java folder inside my Library:Application Support folder.It has a bunch of Java 1.8.x folders within it. Should I Trash that folder?
Go into System Preferences and check the Java panel there. There are some sites that use Java, unfortunately, but I've made it a hard, fast rule to only update Flash and Java from System Preferences. There are too many nasties out there that piggyback in on those supposed updates.
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Try visiting the Apple website and click on Support. Once there, search "Java 2015" and you can download the Java update thru Apple. This is a safe way to get the update.
Most websites are getting rid of Java, but if it is a website you visit often or need to use this will help.
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Thanks. Evidently the messages were coming from the Java Control panel and they're OK.
Thanks for the tip, Phyllis. I didn't know about updating from System Preferences. Good idea. ill do from now on.