Re: Removing old versions of the JDK

Subject: Re: Removing old versions of the JDK

From: Michael Hall <email@hidden>

Date: Thu, 05 Apr 2012 04:38:41 -0500

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On Apr 5, 2012, at 2:24 AM, Dannes Wessels wrote:

All these JVMs are registered in the Java preferences app, actually the old (vulnerable) versions were still active and had a higher priority than the newer versions. This surprised me a bit.

One thing you might want to do after an install is verify that you are running what you think you are, from Terminal....

java -version

openjdk version "1.7.0-u4-b228"

OpenJDK Runtime Environment (build 1.7.0-u4-b228-20120203)

OpenJDK 64-Bit Server VM (build 23.0-b12, mixed mode)

Mac-User:~ mjh$ /usr/libexec/java_home -v 1.6 --exec java -version

java version "1.6.0_31"

Java(TM) SE Runtime Environment (build 1.6.0_31-b04-413-10M3623)

Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01-413, mixed mode)

I use my own java shell app sometimes....

versions

System.in:3:java.runtime.version=1.7.0-u4-b10-20120211

System.in:4:java.version=1.7.0-u4-b10

System.in:7:java.class.version=51.0

System.in:10:java.vm.version=23.0-b14

System.in:20:java.vm.specification.version=1.7

System.in:26:java.specification.version=1.7

Where versions is actually an alias for....

set alias.versions

alias.versions=set java.* | grep version

Actually, I use this fairly often as a standard application test case, a simple one that still exercises alias and command parsing and thread piping.

I wondered about this after my install as well but for me it was because I showed no saved older versions. I switched machines recently so I guess I must not have done any updates since then. Although I thought I had. If you want to get rid of the old versions I think you can just delete or drag them to the trash. Hanging onto one for a little while as a fallback backup might be an idea though.

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References:

>Removing old versions of the JDK (From: Dannes Wessels <email@hidden>)