Java Installation on Mac: Difference between revisions
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* [[Mac#Subjects|Mac]] | * [[Mac#Subjects|Mac]] | ||
=Overview= | |||
By default, no Javs is installed, when first attempting to use I get this: | By default, no Javs is installed, when first attempting to use I get this: | ||
<pre> | |||
NOMBP2:~ ovidiu$ java -version | NOMBP2:~ ovidiu$ java -version | ||
No Java runtime present, requesting install. | No Java runtime present, requesting install. | ||
</pre> | |||
and a GUI window pops up: "to use the "java" command-line tool you need to install a JDK". More Info ... which says to go to the Oracle site. | and a GUI window pops up: "to use the "java" command-line tool you need to install a JDK". More Info ... which says to go to the Oracle site. | ||
=Oracle SDK Installation= | |||
Download the latest for Mac (jdk-8u25-macosx-x64.dmg or jdk-7u75-macosx-x64.dmg, depending of whether you need Java 8 or Java 7). | Download the latest for Mac (jdk-8u25-macosx-x64.dmg or jdk-7u75-macosx-x64.dmg, depending of whether you need Java 8 or Java 7). | ||
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Double-click on DMG, then on PKG. | Double-click on DMG, then on PKG. | ||
By default, it will install it in | By default, it will install it in <tt>/usr/bin/java</tt>, which is a link to <tt>/System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java</tt>. | ||
The default JAVA_HOME is | The default <tt>JAVA_HOME</tt> is: | ||
<pre> | |||
/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home | /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home | ||
</pre> | |||
It can be obtained running | It can be obtained running | ||
<pre> | |||
/usr/libexec/java_home | /usr/libexec/java_home | ||
</pre> | |||
=JAVA_HOME= | |||
For a standard installation the value of <tt>JAVA_HOME</tt> is returned by the result of <tt>/usr/libexec/java_home</tt>: | |||
<pre> | |||
export JAVA_HOME=$(/usr/libexec/java_home) | export JAVA_HOME=$(/usr/libexec/java_home) | ||
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export PATH=${JAVA_HOME}/bin:${PATH} | export PATH=${JAVA_HOME}/bin:${PATH} | ||
</pre> | |||
/usr/libexec/java_home returns returns the path to a Java home directory from the current user's settings. | <tt>/usr/libexec/java_home</tt> returns returns the path to a Java home directory from the current user's settings. | ||
In case multiple JDKs are installed, the | In case multiple JDKs are installed, the <tt>java_home</tt> command line variables can be used to filter which <tt>JAVA_HOME</tt> is returned: | ||
-v filters on version | -v filters on version | ||
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To see al JVMs installed: | To see al JVMs installed: | ||
<pre> | |||
/usr/libexec/java_home -V | /usr/libexec/java_home -V | ||
</pre> | |||
=Default Java 1.6 Location= | |||
<pre> | |||
/Library/Java/Home/ | /Library/Java/Home/ | ||
</pre> | |||
If you want /usr/libexec/java_home to return the Java 6 home, run it with: | If you want /usr/libexec/java_home to return the Java 6 home, run it with: | ||
<pre> | |||
/usr/libexec/java_home -v 1.6 | /usr/libexec/java_home -v 1.6 | ||
</pre> | |||
Revision as of 19:08, 6 June 2016
Internal
Overview
By default, no Javs is installed, when first attempting to use I get this:
NOMBP2:~ ovidiu$ java -version No Java runtime present, requesting install.
and a GUI window pops up: "to use the "java" command-line tool you need to install a JDK". More Info ... which says to go to the Oracle site.
Oracle SDK Installation
Download the latest for Mac (jdk-8u25-macosx-x64.dmg or jdk-7u75-macosx-x64.dmg, depending of whether you need Java 8 or Java 7).
Double-click on DMG, then on PKG.
By default, it will install it in /usr/bin/java, which is a link to /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java.
The default JAVA_HOME is:
/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home
It can be obtained running
/usr/libexec/java_home
JAVA_HOME
For a standard installation the value of JAVA_HOME is returned by the result of /usr/libexec/java_home:
export JAVA_HOME=$(/usr/libexec/java_home)
...
export PATH=${JAVA_HOME}/bin:${PATH}
/usr/libexec/java_home returns returns the path to a Java home directory from the current user's settings.
In case multiple JDKs are installed, the java_home command line variables can be used to filter which JAVA_HOME is returned:
-v filters on version
-a filters on architecture
-d filters on data model.
To see al JVMs installed:
/usr/libexec/java_home -V
Default Java 1.6 Location
/Library/Java/Home/
If you want /usr/libexec/java_home to return the Java 6 home, run it with:
/usr/libexec/java_home -v 1.6