# Crashes and Freezes

# Overview

Studio does its best not to crash, but when it does, there are helpful pieces of information you can send to the developers.

# Freezes

A freeze is likely caused by either a deadlock in code or an infinite loop. To diagnose:

1. If you are on OS X or have the JDK installed on Windows, you can use the jps command

2. To check, try typing jps on the command line, or you may need to look in c:\Program Files\Java\jdk_directory\bin or wherever your Java is installed. If you do not have a directory with "JDK" in the name, you won't be able to use JPS.

# Using JPS

1. Open a command prompt.

2. Type jps -v shows you a list of jvm process ids. You should see one referencing Eclipse.

3. Type jstack <pid> >> logfile.logto dump the stack trace for the specified VM process id. Copy this into a file and attach it to the JIRA ticket. You may need to pipe the output to a location where you have write permissions, i.e.:

   1. c:\Program Files\Java\jdk1.6.0_29\bin\jstack 2616 >> "C:\Users\Username\Desktop\test2.log"

Example:

Machine$ jps -v
9528 Jps -Dapplication.home=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home -Xms8m
8455  -Dorg.eclipse.swt.internal.carbon.smallFonts -Xms40m -Xmx1024m -Declipse.p2.unsignedPolicy=allow -Declipse.log.size.max=10000 -Declipse.log.backup.max=5 -Xdock:icon=../Resources/titanium.icns -XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts -XX:MaxPermSize=256m
Machine$ jstack 8455 >> logfile.log

# Without JPS

Unfortunately, the easiest way requires restarting Studio on the command line. If that's not possible for some reason, you can use this free tool (though it requires registration: http://www.adaptj.com/main/tracehowtos (opens new window))

To use the command line:

1. Start Studio on the command line:

   1. On Windows: Appcelerator Studio.exe -consolelog, TitaniumStudio.exe -consolelog or AptanaStudio.exe -consolelog

   2. On OS X: /Applications/Appcelerator\ Studio/AppceleratorStudio.app/Contents/MacOS/AppceleratorStudio, /Applications/Titanium\ Studio/TitaniumStudio.app/Contents/MacOS/TitaniumStudio or /Applications/Aptana\ Studio\ 3/AptanaStudio3.app/Contents/MacOS/AptanaStudio3

2. You may wish to adjust the buffer size of your console

   1. On Windows, right-click in the console window and choose Properties. Set the buffer size to 3000.

3. Enter the key sequence <ctrl> + \ in the console window.

4. Copy and paste the resulting output information into a document, and attach it to the JIRA ticket

# JVM Terminated

When this happens, you'll see a rectangular dialog with a title of JVM Terminate on your screen and Studio will disappear. This indicates Java itself has crashed, but it creates a log file in the process.

By default, the crash file should be in either the Studio installation directory, or in the system temp directory, most likely with a file name of hs_err_pid*.log. If you still could not locate it, follow the directions here:

• Finding your Error Log (opens new window)

• On OS X, the location is ~/Library/Logs/Java/*.crash.log or ~/Library/Logs/CrashReporter, and the file will have the word java in its name.

Please attach this log if you submit a support ticket.