See JDK 7 and JRE 7 Installation Guide for general information about installing JDK 7 and JRE 7.

See the Mac OS X Platform Install FAQ for general information about installing JRE 7 on Mac OS X.

Contents

Hence on my Mac running Lion (10.7.5) I use the same command with '-v 1.6'. This is crucial because I need Java 6 and Oracle doesnt provide one for Mac OS - only Java 7, and this allows me to use the installed JAva 6 even though Java 7 is installed. – Rhubarb May 20 '13 at 11:43.

System Requirements

• Any Intel-based Mac running Mac OS X 10.7.3 (Lion) or later.
• Administrator privileges.

Note that installing the JRE on a Mac 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, first uninstall the current version. Installing a JRE from Oracle will

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java to your path. To be able to do this, you need to install the JDK.

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The JRE installation includes the JavaFX Runtime which is incorporated into the same directory structure.

Installation of the 64-bit JRE on Mac Platforms

Depending on your processor, the downloaded file has one of the following names:

• jre-7u<version>-macosx-amd64.dmg
• jre-7u<version>-macosx-x64.dmg

Where <version> is 6 or later.

1. Download the file. Before the file can be downloaded, you must accept the license agreement.

2. From either the Downloads window of the browser, or from the file browser, double click the .dmg file to launch it.

3. A Finder window appears containing an icon of an open box and the name of the .pkg file Double click the package icon to launch the Install app.

4. The Install app displays the Introduction window. Click Continue.

4a. Note that, in some cases, a Destination Select window appears. This is a bug, as there is only one option available. If you see this window, select Install for all users of this computer to enable the continue button. Click Continue.

5. The Installation Type window appears. Click Install.

6. A window appears which says 'Installer is trying to install new software. Type your password to allow this.' Enter the Administrator login and password and click Install Software.

7. The software is installed and a confirmation window appears.

After the software is 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 Mac 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 Macs 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:

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.

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:

• Navigate to /Library/Internet Plug-Ins and remove the JavaAppletPlugin.plugin directory.
• Navigate to /Library/PreferencePanes and remove JavaControlPanel.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.

Installing the software

Windows

1. Make sure you have a recent Java JRE installed on your system. Gephi is compatible with Java 7 and 8 versions. Download Free Java here.
2. After the download completes, run the installer and follow the steps.

Mac OS X

1. After the download completes, click on the downloaded .dmg file.
2. Drag the gephi application in your Application folder.

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Linux

1. Update your distribution with the last official JRE 7 ir 8 packages.
2. After the download completes, unzip and untar the file in a directory.
3. Run it by executing ./bin/gephi script file.

Troubleshooting

Java 7 standard edition or newer required

Check you have Java properly installed on your system. If you're on Linux, you may provide the path to the jdk with ./bin/gephi --jdkhome $JAVA_HOME

JVM Creation failed

This error message is due to memory settings, see following section.

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Memory

Memory available to Gephi is determined by Java. Less or more memory can be allocated by configuring Gephi’s startup settings. If too less memory is allocated, Gephi will stop running when it reached the limit and you will loose your current work. If more memory than what the system is equipped with is set, Java will not be able to start and return “JVM Creation failed” message. By default, maximum memory is set to 512mo.

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To modify memory settings, you need to edit gephi settings file. Modify the value after the -Xmx option to change the maximum heap space. For example, to use a heap size between 256 and 1024 MB, change the options to -Xms256m and -Xmx1024m. If you have Gephi open, you must close and reopen Gephi before new options take effect. On computers with 2GB of memory, you can set -Xmx1400 to get maximum performance.

How to edit gephi.conf:

• On Windows, go to the Gephi folder in Start menu and click on Startup Settings. Edit this file with Notepad or WordPad. Alternatively, go in C:Program Files (x86)Gephi 0.9etcgephi.conf and edit file manually.
• On Mac OS X, right-click on Gephi application icon and select Show Package Contents to open a new Finder window displaying a Contents folder. Open the Contents folder, and then open the Resources/gephi/etc folder, in which the gephi.conf file resides. Use TextEdit to edit the file.
• On Linux, go into your application directory and then into the etc folder. Edit the file with a text editor.

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When multiple JRE or JDK are installed on the same machine, you can specifty to Gephi to use a particular path. Edit gephi.conf as described in the upper section, uncomment the jdkhome line and set the JRE or JDK path.

User files

Locate and delete gephi user directory to clean your installation.

• On Windows 2K/XP, user diretory is located in C:Documents and SettingsusernameApplication Data.gephi
• On Windows Vista/Seven/8/10, user directory is located in C:UsersusernameAppDataRoaming.gephi
• On Mac OS X, user directory is located in /Users/username/Library/Application Support/gephi
• On Linux, user diretory is located in /home/username/.gephi