Dart Editor is based upon the Eclipse Integrated Development Environment (IDE), so it needs the Java VM to run. Sometimes, problems can arise because of this; if this is the case, be sure to consult the Dart Editor Troubleshooting page on the Dart website at https://www.dartlang.org/tools/editor/troubleshoot.html.
Some of the JVM settings used by Dart Editor are stored in the DartEditor.ini file in the dart installation directory. This typically contains the following settings (on a Windows system):
-data @user.home\DartEditor -vmargs -d64 -Dosgi.requiredJavaVersion=1.6 -Dfile.encoding=UTF-8 -XX:MaxPermSize=128m -Xms256m -Xmx2000m
If you notice strange or unwanted behavior in the editor, deleting the settings folder pointed to by –data and its subfolders can restore things to normal. This folder can be found at different locations depending on the OS; the locations are as follows:
On a Windows system,
C:\Users\{your username}\DartEditorOn a Linux system,
$HOME/.dartEditorOn an OS X system,
$HOME/Library/Application Support/DartEditor
Deleting the settings folder doesn't harm your system because a new settings folder is created as soon as you reopen Dart Editor. You will have to reload your projects though. If you want to save the old settings, you can rename the folder instead of just deleting it; this way, you can revert to the old settings if you ever want to.
The settings for data points to the DartEditor folder are in the users home directory, which contains various settings (the metadata) for the editor. Clearing all the settings removes the metadata the editor uses.
The -d64 or –d32 value specifies the bit width necessary for the JVM. You can check these settings for your installation by issuing the command java –version in a terminal session, whose output will be as follows:
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
If this does not correspond with the –d setting, make sure that your downloaded Dart Editor and the installed JVM have the same bit width, by downloading a JVM for your bit width.
Tip
If you work with many Dart projects and/or large files, the memory consumption of the JVM will grow accordingly and your editor will become very slow and unresponsive.
Working within a 32-bit environment will pretty much limit you to 1GB memory consumption, so if you see this behavior, it is recommended to switch to a 64-bit system (Dart Editor and JVM). You can then also set the value of the –Xmx parameter (which is by default set to 2000m = 2 GB) to a higher setting, according to the amount of memory you have installed. This will visibly improve the loading and working speed of your editor!
If your JVM is not installed in the default location, you can add the following line to the .ini file in the line before -vmargs:
-vm /full/path/to/java
If you face a problem, it might be solved by upgrading Dart SDK and the Dart Editor to the latest version. In the Dart Editor menu, select Help and then About Dart Editor. If a new version is available, this will automatically download, and when done, click on Apply the update.