Symptoms

JIRA doesn't display anything on the dashboard. While troubleshooting with Firebug it displays Javascript errors with many undefined properties.

The following appears in the atlassian-jira.log:

Caused by: java.io.FileNotFoundException: /path/to/jira/home/tmp/webresources/67.cachedfile (No such file or directory)
	at java.io.FileOutputStream.open(Native Method)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:194)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:145)
	at com.atlassian.plugin.cache.filecache.impl.CachedFile.streamToCache(CachedFile.java:122)
(...)

Cause

JIRA has lost its webresources cache

Resolution

• Shutdown JIRA;

• Browse to $JIRA_HOME/tmp/webresources;

• Remove all the content on it, if there's any;
• Start JIRA;
• The dashboard will work again and the Javascript errors will cease.