(Redirected from MacOS Runtime for Java)
Developer(s) | Apple Inc. |
---|---|
Stable release | |
Operating system | classic Mac OS |
Type | Java Virtual Machine |
License | Apple SLA |
Website | docs.info.apple.com |
Mac OS Runtime for Java (MRJ, originally Macintosh Runtime for Java) was Apple's proprietary virtual machine for Java-based applications in the classic Mac OS (i.e. versions prior to Mac OS X). Both a runtime environment and a software development kit (SDK) are available.
- A combination of runtime properties and coding changes that targeted Mac OS X specific APIs made a big difference to that audience. Recall that Mac OS X is a melding of two worlds. Hard core UNIX programmers can pop open a Terminal window and write their Java code using vi and compile and run it from the command line.
- If you have not yet installed Apple's Java OS X 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences app. See 'Note for Users of OS X that Include Apple Java 6 Plug-in'. There can be multiple JDKs installed on a system, as many as you wish.
![Download Download](/uploads/1/2/6/3/126310308/983145442.jpg)
See 'Note for Users of OS X that Include Apple Java 6 Plug-in'. Only one JRE can be installed. Installing a JRE removes the previously installed JRE. The JRE version used by the system can be determined in one of two ways: From System Preferences click the Java icon from the Other category. This launches the Java Control Panel.
The runtime environment includes a JIT compiler developed by Symantec, the standard Java class library from Sun, additional classes providing Macintosh-specific functionality, and the Apple Applet Runner (a lightweight application for running Java applets without the overhead of a web browser). A number of web browsers could use MRJ to run Java applets in web pages, including MicrosoftInternet Explorer, iCab and HotJava.
The SDK includes ports of most of the tools from Sun's Java Development Kit (in the form of MPW tools and Macintosh applications), additional tools for packaging Java applications as double-clickable Macintosh applications, libraries for Macintosh-specific functionality, and documentation for the MRJ-specific classes and tools.
MRJ v2.2.5 was compatible with Sun's Java Development Kit version 1.1.8.[1]
Since the transition to Mac OS X, Apple has discontinued MRJ and instead maintains and distributes a port of Oracle'sHotSpot Java virtual machine.[citation needed]
Implementations[edit]
- Java 1.0.2 with Mac OS Runtime for Java v 1.5.1 [1]
- Java 2.2.6 with Mac OS Runtime for Java v 2.2.6 [2]
References[edit]
- ^Cohen, Peter (1 June 2001). 'New Mac OS Runtime for Java available for Mac OS 9'. PCWorld. Retrieved 30 October 2017.
External links[edit]
- Apple.com - Java at the Wayback Machine (archived June 5, 2009)
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Mac_OS_Runtime_for_Java&oldid=935477981'
This page describes how to install and uninstall JRE 8 on OS X computers.
Note: The JRE installation includes the JavaFX Runtime which is incorporated into the same directory structure. |
This page has these topics:
See 'JDK 8 and JRE 8 Installation Start Here' for general information about installing JDK 8 and JRE 8.
See 'OS X Platform Install FAQ' for general information about installing JRE 8 on OS X.
System Requirements
Observe these requirements:
- Any Intel-based computer running OS X 10.8 (Mountain Lion) or later.
- Administrator privileges.
Note that installing the JRE on OS X is performed on a system-wide basis, for all users, and administrator privileges are required. You cannot install Java for a single user.
Only one JRE can be installed at a time. The system will not install a JRE that has a lower version than the current version. If you wish to install a lower version of the JRE, uninstall the current version as described in 'Uninstalling the JRE'.
Installing a JRE from Oracle will not update
java -version
symlinks or add java
to your path. To be able to do this, you need to install the JDK.JRE Downloaded File
Depending on your processor, the downloaded file has one of the following names, where
version
is the update number:jre-8u
version
-macosx-amd64.dmg
jre-8u
version
-macosx-x64.dmg
Installing JRE 8u40
If you are installing JRE 8u40, then follow these steps:
- Download the file.Before the file can be downloaded, you must accept the license agreement.
- From either the Downloads window of the browser, or from the file browser, double click the file
.dmg
to launch it.A Finder window appears containing an icon of an open box and the name of the.app
file. - Double click the package icon to launch the Install app.A window appears that says, 'Java 8 Update 40 is trying to install a new helper tool. Type your password to allow this.'Enter the Administrator login name and password and then click Install Helper.The Install app then displays the Introduction window.
- Click Next.Oracle has partnered with companies that offer various products. The installer may present you with the option to install these programs when you install Java. Specify if you want these programs installed and then click Next.Note:You can disable the presentation of offers during installation by specifying the
--args SPONSORS=0
option in the terminal command line. For example:open /Volumes/Java 8 Update 40/Java 8 Update 40.app --args SPONSORS=0
An Installation Progress window is displayed. Once the software is installed, a confirmation window appears and then an applet is launched to verify the version of Java installed. - Delete the
.dmg
file if you want to save disk space.
Determining the Installed Version of the JRE
If you have not yet installed Apple's Java OS X 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences app. See 'Note for Users of OS X that Include Apple Java 6 Plug-in'.
Only one JRE can be installed. Installing a JRE removes the previously installed JRE. The JRE version used by the system can be determined in one of two ways:
- From System Preferences click the Java icon from the Other category. This launches the Java Control Panel. Click About.
- Type the following in a Terminal window (note escaped space character, ignore line break):
The system will not install a JRE that has a lower version than the current version. If you want to install a lower version, first uninstall the existing version.
Java For Mac 10.6.8
Uninstalling the JRE
To uninstall the JRE, you must have Administrator privileges and execute the remove commands either as root or by using the sudo(8) tool.
Remove one directory and one file (a symlink), as follows:
Java Runtime For Mac Os X
- Navigate to
/Library/Internet Plug-Ins
and remove theJavaAppletPlugin.plugin
directory. - Navigate to /
Library/PreferencePanes
and removeJavaControlPanel.prefpane
.
Do not attempt to uninstall Java by removing the Java tools from
/usr/bin
. This directory is part of the system software and any changes will be reset by Apple the next time you perform an update of the OS.