Problems
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## Problems

This section deals with problems you may experience while using or installing jEdit. Problems that aren't OS specific are listed under “General Problems”.

1. General Problems
  Q: jEdit won't start. What should I do?
  Q: After jEdit starts, I can't see all of the plugins I have downloaded. How can I make them appear?
  Q: During an editing session I get an error message about an “OutOfMemoryError” while working with a large file or performing a lengthy operation. The message reappears every time I retry the operation. How can I prevent this?
  Q: My textarea gets confused about the end of the buffer or in some other way corrupted (the characters are in the wrong place on the screen) every now and then. What should I do?
  Q: Why is jEdit's window movement and resizing so buggy?
  Q: What should I do when the installer displays the message, No such file or directory?
  Q: After downloading jeditXXXinstall.jar (the XXX represents the version number), I tried to run java jeditXXXinstall.jar, but got the error message, Exception in main(), NoClassDefFoundError: jeditXXXinstall/jar. What am I doing wrong?
  Q: jEdit crashed the JVM, what gives?
  Q: jEdit locks up or hangs while I'm doing lots of things!
  Q: I can't remember all these multiple-key shortcuts!
  Q: Why is jEdit so slow to start up?
  Q: Why is jEdit so slow?
  Q: Go to left/top/bottom/right docking area does not work for some plugins?
2. Unix/Linux Problems
  Q: I'm trying to install jEdit on Linux, but I keep getting strange error messages.
  Q: After installing jEdit on Linux, running the jedit command causes the error message: Warning: JAVA_HOME environment variable not set How can I fix this?
3. Windows Problems
  Q: When I try to run jedit.exe I get the message The JEditLauncher component does not appear to be installed.
  Q: When I try to run the jEdit installation package in Windows, I get an error message, Error opening registration key "software\javasoft\java runtime environment". How can I fix this?
  Q: When trying to install jEdit on Windows Me with an MS-DOS prompt, after entering java -jar jeditXXXinstall.jar I get the message bad command or file name. I have tried various alternatives but still cannot install.
  Q: When I run jEdit on Windows, it flashes, blinks, and doesn't display correctly! Why is your program so buggy?

#### 1. General Problems
Q: jEdit won't start. What should I do? Q: After jEdit starts, I can't see all of the plugins I have downloaded. How can I make them appear? Q: During an editing session I get an error message about an “OutOfMemoryError” while working with a large file or performing a lengthy operation. The message reappears every time I retry the operation. How can I prevent this? Q: My textarea gets confused about the end of the buffer or in some other way corrupted (the characters are in the wrong place on the screen) every now and then. What should I do? Q: Why is jEdit's window movement and resizing so buggy? Q: What should I do when the installer displays the message, No such file or directory? Q: After downloading jeditXXXinstall.jar (the XXX represents the version number), I tried to run java jeditXXXinstall.jar, but got the error message, Exception in main(), NoClassDefFoundError: jeditXXXinstall/jar. What am I doing wrong? Q: jEdit crashed the JVM, what gives? Q: jEdit locks up or hangs while I'm doing lots of things! Q: I can't remember all these multiple-key shortcuts! Q: Why is jEdit so slow to start up? Q: Why is jEdit so slow? Q: Go to left/top/bottom/right docking area does not work for some plugins?
Q: | jEdit won't start. What should I do?
A: | If you don't have a clue as to why you cannot run jEdit, it's best to perform a step-by-step diagnosis. If it never worked before, begin by finding the Java application loader you are using: `java.exe`, `javaw.exe` or `java`. Make sure it is running by entering its full path with the `-h` parameter in a terminal or console window. If you can't find the Java application loader, your Java runtime environment package may be missing or incomplete. Next, find where you have installed jEdit. You should look for the file `jedit.jar` which contains all of the application's Java class files in a compressed archive. Once you have both files, run the Java loader with the `-jar` option and with `jedit.jar` as the target. Make sure that you either specify full paths for both files or that the directories for the files are part of your `PATH` environment variable. If jEdit does not load at this point, the likely problem is a corrupt `jedit.jar` file. Try downloading the application again. If jEdit does load using this procedure, you need to examine the “shortcut” loading mechanism you wish to use. On Linux and MacOS X, you need to find and examine the `jedit` shell script provided by the installation routine to confirm that the script's commands target the correct files and locations, and that variables like `JAVA_HOME` are either defined in the script or elsewhere in your shell's environment. Don't forget to make sure that the script's file permissions allow you to execute it as a shell script. On Windows, if you are using a batch script to run jEdit, the same points (other than file permissions) apply to examining `jedit.bat`. If you are using jEditLauncher, run `jedit /p` in jEdit's installation directory from a command line to get the custom loader's setup dialog. Here you can check the paths for both the Java application loader and jEdit as well as any command line parameters for both programs. Make sure that you have placed Java and jEdit options in the correct input fields. If the parameters seems correct but jEdit will not load with the Windows launcher, try uninstalling and reinstalling the launcher by running `jedit /u` followed by `jedit /i`. ### But it worked before! It just stopped working after an upgrade. What should I do? If it used to work for an older version and no longer works, it could be that you have some old crud (bad settings, unsupported plugins) in your jEdit settings directory (`~/.jedit` on Linux, `%APPDATA%\jEdit` on Windows, or `~/Library/jEdit` on MacOS). You may want to try renaming the offending directory to something else, and restarting jEdit with fresh settings. You can later copy things from your old settings back if you find you are missing things. If at this point you're still stuck, ask for help on the jedit-users mailing list, the jEdit Community “Installation” message board or on IRC. You're bound to find someone quickly.
Q: | After jEdit starts, I can't see all of the plugins I have downloaded. How can I make them appear?
A: | If you use jEdit's Plugin Manager to download and install plugins, your plugins will be found in the `jars` subdirectory of one of two directories: either the directory in which jEdit is installed, or the current user's settings directory. These are the only location jEdit examines when it loads plugins at startup. The default location of the settings directory depends on your operating system. You can find out its location during a jEdit session by evaluating `jedit.getSettingsDirectory()` in BeanShell. The settings directory can be changed by using the `-settings` command line parameter. If you change the location of the settings directory with this parameter, jEdit will not be able to find plugin archive files in the old location. If you use or change the `-settings` parameter, make sure your plugins don't get left behind.
Q: | During an editing session I get an error message about an “OutOfMemoryError” while working with a large file or performing a lengthy operation. The message reappears every time I retry the operation. How can I prevent this?
A: | The memory requirements of jEdit vary greatly depending on how many files are in use, and what plugins you are using. You can see how much it is using in the status bar. One solution that often works is to set or increase the allocation of memory to the heap for Java objects created by the Java Virtual Machine in which jEdit is running. Add a command line option `-Xmx640m` to the options passed to the version of the Java application loader you are using (such as `java`, `java.exe` or `javaw.exe`). In place of the `640` in the option, use a number of megabytes you think is appropriate for the maximum heap size. If you already are using the option, try doubling it. If you are using the `-jar` command line option with Java to run jEdit, remember that the `-jar` parameter must be the last Java option, followed immediately by the path to `jedit.jar` and then any jEdit command line options. On Windows, if you are using the `jedit.exe` launcher, you can add or change the JVM arguments by editing a file called `jEdit.l4j.ini` in the same directory as the `jedit.exe`. Place one JVM argument (e.g. `-Xmx512m`) on each line by itself. If out of memory errors occur while running a build or compilation operation from within jEdit, you can also have the operation run in an external process rather than inside the same Java Virtual Machine running jEdit. The AntFarm plugin, for example, lets you select this approach as a configuration option. In other cases, you can run an external program using the command line interface of the Console plugin, which will capture and display the output of the external process and in many cases parse the output for error information.
Q: | My textarea gets confused about the end of the buffer or in some other way corrupted (the characters are in the wrong place on the screen) every now and then. What should I do?
A: | It happens to me sometimes too. I have this macro to work around it for now:
    /** Reset_TextArea.bsh */
    view.splitVertically();
    view.unsplitCurrent();
Run this, and jEdit creates a new TextArea for you, and that one won't be confused. This can help avoid the need to restart jEdit. If you can reproduce the steps you took to cause this, please submit a bug report that details what plugins/versions you were using, and how to reproduce it. It may be specific to a file you are editing, or a particular combination of settings you are using, or sequence of actions you performed.
Q: | Why is jEdit's window movement and resizing so buggy?
A: | Perhaps the option to let Java draw window borders is enabled. This option can lead to strange behavior on some Java versions and operating systems. Disable it in the Appearance tab of the Utilities>Global Options dialog box.
Q: | What should I do when the installer displays the message,
    No such file or directory
?
A: | The full message that you may receive from the Java application launcher begins as follows:
    Exception in thread "main" java.util.zip.ZipException: No such file or directory
    ...
This means that the Java application launcher cannot read the jar archive file that you specified on the command line. If your Java runtime environment otherwise runs properly, then either you have named the incorrect file name or the installation file is corrupt or incomplete. Check the file name, download the installer again if necessary, and be sure to follow any specific instructions for your operating system posted on the jEdit web site.
Q: | After downloading `jeditXXXinstall.jar` (the `XXX` represents the version number), I tried to run `java jeditXXXinstall.jar`, but got the error message,
    Exception in main(), NoClassDefFoundError: jeditXXXinstall/jar.
What am I doing wrong?
A: | You need to specify the `-jar` option for the Java application loader so that the loader will search the installation archive for the starting class file. Without the option, it treats the archive as a single class file (which it is not!), thus producing the error. The correct command line would be `java -jar jeditXXXinstall.jar`.
Q: | jEdit crashed the JVM, what gives?
A: | It's important to realise that java applications should never do this. The problem is almost certainly a bug in the JVM. Problems of this nature are often tricky to solve. Depending on your platform, there should be information logged about what caused the crash to occur. For Unix type systems you will likely get an error in the console (and for Mac OS X you may also get a report in ~/Library/Logs/CrashReporter/JavaApplicationStub.crash.log).
Q: | jEdit locks up or hangs while I'm doing lots of things!
A: | Sometimes, it can be due to a deadlock, or an infinite loop, or something else. You need to obtain a thread dump from the time of hang, and attach that as a textfile to your bug report, explaining what you were doing at the time. One way to obtain a thread dump, is to run jEdit with `java -jar jedit.jar` from a command line shell in the foreground, wait for the hang or lockup, and type Ctrl+\ (or Ctrl+Break on Windows) into the shell window. You should see a thread dump printed immediately that will help diagnose the problem. Another way to get a thread dump is to run jEdit as you normally would, then run visualvm. You can right click on the jEdit process from within visualvm and choose "thread dump".
Q: | I can't remember all these multiple-key shortcuts!
A: | Install ShortcutDisplay plugin for help.
Q: | Why is jEdit so slow to start up?
A: | Some plugins require a lot of setup - chances are if you disable one, you will be able to determine the culprit. jEdit normally starts up quite quickly without plugins. To go the Utilities menu and select Activity Log. Scroll to the area where you see lines like “[notice] JARClassLoader: Starting plugin XXX”. You should be able to see which (if any) plugins are causing an excesively long delay.
Q: | Why is jEdit so slow?
A: | There may be many causes for this. Java by nature is more demanding on hardware than native applications. Modern computers should not have much problem with this. The most likely cause is plugins that parse buffers or do other computationally expensive operations. These include XML, JavaSideKick, and CodeAid. If performance is important to you, installing a whole batch of plugins in one go is probably not a very good idea. Install them one at a time, so you can evaluate the effects of each.
Q: | Go to left/top/bottom/right docking area does not work for some plugins?
A: | The plugin is missing a `requestDefaultFocus()` method. Check the jedit plugin bugs tracker to see if the ticket is already opened and you can open a ticket if it's not there.
#### 2. Unix/Linux Problems
Q: I'm trying to install jEdit on Linux, but I keep getting strange error messages. Q: After installing jEdit on Linux, running the jedit command causes the error message: Warning: JAVA_HOME environment variable not set How can I fix this?
Q: | I'm trying to install jEdit on Linux, but I keep getting strange error messages.
    Exception in thread "main" java.lang.UnsupportedClassVersionError:
    installer/Install (Unsupported major.minor version 49.0)
    Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
A: | Make sure the version of Java you are running is Sun Java 1.6 or higher. In debian/ubuntu, `apt-get install sun-java6-jdk`
Q: | After installing jEdit on Linux, running the `jedit` command causes the error message:
    Warning: JAVA_HOME environment variable not set
How can I fix this?
A: | Your `jedit` shell script should be modified to set the `JAVA_HOME` variable to the directory containing the executables of your desired Java runtime environment (JRE).
#### 3. Windows Problems
Q: When I try to run jedit.exe I get the message The JEditLauncher component does not appear to be installed. Q: When I try to run the jEdit installation package in Windows, I get an error message, Error opening registration key "software\javasoft\java runtime environment". How can I fix this? Q: When trying to install jEdit on Windows Me with an MS-DOS prompt, after entering java -jar jeditXXXinstall.jar I get the message bad command or file name. I have tried various alternatives but still cannot install. Q: When I run jEdit on Windows, it flashes, blinks, and doesn't display correctly! Why is your program so buggy?
Q: | When I try to run `jedit.exe` I get the message
    The JEditLauncher component does not appear to be installed.
A: | The dialog presenting this message asks if you would like to install the launcher. Select `Yes` and supply further information as prompted. A file named `install.log` is generated in the same directory as `jedit.exe` that contains information on the launcher's installation. You can send this file along with jEdit's Activity Log if you continue to have problems running jEdit with the launcher package.
Q: | When I try to run the jEdit installation package in Windows, I get an error message,
    Error opening registration key
    				"software\javasoft\java runtime	environment".
How can I fix this?
A: | The problem is not with jEdit but may be caused by your installation of the Java runtime environment. Under Windows, Sun's Java application loader relies on entries in the Windows registry to find the files that create the runtime environment and a Java virtual machine. The loader (`java.exe`e or `javaw.exe`) is unable to find the necessary registration entry and therefore sends the error message. The best approach to fixing this is to uninstall and reinstall the JDK.
Q: | When trying to install jEdit on Windows Me with an MS-DOS prompt, after entering `java -jar jeditXXXinstall.jar` I get the message `bad command or file name`. I have tried various alternatives but still cannot install.
A: | You should confirm that you have a Java runtime environment installed, which will include `java.exe` and the version that omits a separate terminal window, `javaw.exe`. Make sure that the directory containing `java.exe` or `javaw.exe`is found in the value of your `PATH` environment variable. Otherwise you should give the full path to the chosen loader on your command line.
Q: | When I run jEdit on Windows, it flashes, blinks, and doesn't display correctly! Why is your program so buggy?
A: | A frequent cause of this problem is buggy video drivers and/or a buggy DirectDraw implementation. A workaround is to disable Java's use of DirectDraw by adding the following option to the Java virtual machine command line:
    -Dsun.java2d.noddraw=true

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