FAQ How do I run Eclipse?
Oracle/Sun VM 1.6.0_21 on Windows
The Eclipse 3.3 - 3.6 launchers for Windows had a problem with the Oracle/Sun Java VM version '1.6.0_21-b06'.
UPDATE: Oracle/Sun have released a respin of their JDK/JRE to fix this, so the recommended resolution of this problem is to download and re-install version 1.6.0_21-b07' or higher from http://www.java.com (alternative link is http://java.sun.com/javase/downloads/index.jsp). Make sure you have b07 or higher by running java -version.
Before the fix was released, there were three choices to work around this:
- switch back to '1.6.0_20' (as of July 19, 2010 it can still be downloaded here)
- Change the commandline for launching or add the following line after "-vmargs" to your Eclipse.ini file:
- For 32-bit Helios, download the fixed eclipse_1308.dll and place it into
When you unzip Eclipse, the directory layout looks something like this:
eclipse/ features/ ''the directory containing Eclipse features'' plugins/ ''the directory containing Eclipse plugins'' eclipse.exe ''platform executable'' eclipse.ini eclipsec.exe ''(windows only) console executable'' epl-v10.html ''the EPL license'' jre/ ''the JRE to run Eclipse with'' notice.html readme
You can start Eclipse by running eclipse.exe on Windows or eclipse on other platforms. This small launcher essentially finds and loads the JVM. On Windows, the eclipsec.exe console executable can be used for improved command line behavior.
Alternatively, you can launch Eclipse by directly invoking the JVM as follows:
java -jar eclipse/plugins/org.eclipse.equinox.launcher_1.0.0.v20070606.jar
NOTE: The version of org.eclipse.equinox.launcher in the above command must match the version actually shipped with Eclipse. For more details on launching Eclipse using Java (not eclipse.exe) with the launcher, see Starting Eclipse Commandline With Equinox Launcher.
Find the JVM
If a JVM is installed in the eclipse/jre directory, Eclipse will use it; otherwise the launcher will consult the eclipse.ini file and the system path variable. Eclipse DOES NOT consult the JAVA_HOME environment variable.
To explicitly specify a JVM of your choice, you can use the -vm command line argument:
eclipse -vm c:\jre\bin\javaw.exe ''start Java by executing the specified java executable eclipse -vm c:\jre\bin\client\jvm.dll ''start Java by loading the jvm in the eclipse process
See the launcher page for more details on specifying a JVM.
The most recommended way to specify a JVM for Eclipse to run in is to put startup configuration into the
Eclipse.ini file in the same folder as the Eclipse executable (
eclipse.exe on Windows). The Eclipse program launcher will read arguments from either the command-line or the configuration file named
Eclipse.ini. To specify a JVM using configuration file, include the -vm argument in
Eclipse.ini, for example:
Note: there are no quotes around this path as would be required when executing the same from the command-line were the path to contain white space, etc. This is a common mistake when using Windows.
Eclipse now will launch without additional arguments in the command-line, with the JVM specified in the
Eclipse.ini configuration file.
You should always use -vm so you can be sure of what VM you are using. Installers for other applications sometimes modify the system path variable, thus changing the VM used to launch Eclipse without your knowing about it.
The format of the eclipse.ini file is very particular; it is strongly recommended to readEclipse.iniand folow the examples there.
When Eclipse starts, you are prompted to choose a workspace location on start-up. This behavior can be configured in the Preferences. You can manually specify the workspace location on the command line, using the -data <workspace-path> command-line argument.
Fixing the "Could not create Java Virtual Machine" error
There's a bug in Helios SR1 that results in a "Could not create Java Virtual Machine" error on WinXP/Sun JDK 1.6_nn (also found in other OS/JDK combinations). To fix that, create a back up of the original eclipse.ini. Then, edit the eclipse.ini file and remove the 2 sets of lines concerning the launcher's MaxPermSize. Insert a "-vm" arg along with the path to the javaw executable found under JAVA_HOME/jre/bin. Under -vmargs, Increase the min and max heap to 512m and 1024m, respectively. Also, add the MaxPermSize setting. Change the "RequiredJavaVersion" setting according to the JDK version you are using.
Here is the resulting eclipse.ini:
-startup plugins/org.eclipse.equinox.launcher_1.1.0.v20100507.jar --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.1.R36x_v20100810 -product org.eclipse.epp.package.jee.product --launcher.defaultAction openFile -showsplash org.eclipse.platform --launcher.defaultAction openFile -vm C:/Program Files/Java/jdk1.6.0_19/jre/bin/javaw -vmargs -Dosgi.requiredJavaVersion=1.6 -Xms512m -Xmx1024m
OLD: Starting Eclipse 3.2
In Eclipse 3.2 and earlier, there was an additional file in the root of Eclipse: startup.jar. This jar file contained the classes needed to start the platform. In 3.3 and above the equivalent classes are in the org.eclipse.equinox.launcher bundle.
To start 3.2 by directly invoking the JVM use the following command:
java -cp eclipse/startup.jar org.eclipse.core.launcher.Main
Eclipse 3.2 did not contain a console version of the executable.
- FAQ How do I increase the heap size available to Eclipse?
- FAQ How do I increase the permgen size available to Eclipse?
- FAQ Who shows the Eclipse splash screen?
- The Eclipse Program Launcher
- Equinox Wiki Category
- Running Eclipse 3.3M5+
This FAQ was originally published in Official Eclipse 3.0 FAQs. Copyright 2004, Pearson Education, Inc. All rights reserved. This text is made available here under the terms of the Eclipse Public License v1.0.
The -data option does not work if a relative path is specified. If this is true, please point it out the FAQ above. Thank you.
Specifying -vm "c:\program files\..." seems to work for galileo.