How to properly install Java in OS X

Question

When I look at System Preferences > Java > Update, I see

Your system has the recommended version of Java.
Java 7 Update 79
From Terminal, java -version:

java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)
From Terminal, export:

JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home"
In addition to that, I also have the Java from Apple/Oracle installed as well (when first prompted to install when opening a Java-based app when there's no Java yet installed)

Questions:

Is Java 7 Update 79 == jdk1.7.0._71.jdk? Or are these separate?
When running some thing with Java, there is always the following:

objc[63077]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home/jre/bin/java and /Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.

I'd be more than willing starting from scratch had I understood the steps to do that properly (remove, re-install). If it matters, am running OS X 10.10.

Possible duplicate of Why does the version of Java verified by Oracle differ from the version shown at the command line? — mmmmmm, Jun 24 '16 at 10:59

score 3 · Accepted Answer · answered May 23 '15 at 08:09

3

System Preferences shows the Java used for web applets and java -version the one found by /usr/bin/java

To get the latter install the JDK not the JRE

answered May 23 '15 at 08:09

mmmmmm

30,160

Okay. Downloading "Java SE Development Kit 7u79" for OS X. – Idan Adar May 23 '15 at 08:12
After installing it, "java -version" still shows _71. I suppose that is because of the JAVA_HOME path? – Idan Adar May 23 '15 at 08:14
We need to get more accurate on the correct download path Oracle has really messed this yp – mmmmmm May 23 '15 at 08:16
After updating JAVA_HOME, "java -version" now showing _79, so that's up-to-date now. However the error mentioned in question #2 remains. – Idan Adar May 23 '15 at 08:16
That should be a separate question - and I think the answer is not use JAVA_HOME - use /usr/libexec/java_home – mmmmmm May 23 '15 at 08:19
You mean use "/usr/libexec/java_home" as the path value for JAVA_HOME? – Idan Adar May 23 '15 at 08:21
Looks to be an open bug: https://bugs.openjdk.java.net/browse/JDK-8022291 – Idan Adar May 23 '15 at 08:26
1

This is a horrible bug.. it wont go away – Tyler Oct 27 '15 at 14:56
@IdanAdar this should be two questions as I have answered one and the other question leads to a sparer answer re the bug – mmmmmm Oct 27 '15 at 15:24

score 1 · Answer 2 · answered Nov 09 '21 at 00:25

The following generally works for Java, versions 8 through 17.

brew install java may not be the best way to install Java.

Java JDK should be unzipped into a folder identifying it, withing /Library/Java/JavaVirtualMachines . I usually either manually download JDK and unzip it into the above folder OR install it via jenv command. The former gives you more control.

Then you should have jenv installed and have this in your .bash_profile :

export PATH="$HOME/.jenv/bin:$PATH"
eval "$(jenv init -)"

Don't install Java with brew . Instead: brew install jenv . Then, install Java (OR link to your installed java) using jenv.

How to properly install Java in OS X

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