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When I click "preview" for my GUI application, which is a JFrame with a tabbed pane inside it that has 6 tabs, one of which is another class, everything seems to be normal. However, when I have been switching between the tabs for about 10 seconds, NetBeans acts as if it has entered a while loop displaying empty frames with "Error" as the title. This lags my system so much I am forced to hold down the power off button. When I reboot NetBeans, nothing strange occurs, and Exception Reporter does not seem to notice (Probably because I am forced to power off my system). This has happened three times.
look into the ide's logfile ($userdir/var/log/messages*), there's a chance that some of the error(s) got logged before you shut down the system. Please attach the relevant log parts.
Can you provide the form where the problem happens? Ideally attach the whole project (or a stripped-down sample project that still allows to open the form). Also please provide the log file (see http://wiki.netbeans.org/FaqLogMessagesFile) so we know what the error was. If you started NetBeans without the error meanwhile, the error will not be in messages.log but in the older log files (messages.log.1 or messages.log.2). I suspect it was a problem of some of the custom component added to the form.
Created attachment 159043 [details] The entire 'messages.log' file from ~/.netbeans/8.1/var/log/messages.log: messages.log.1 and messages.log.2 were both empty.
That log file contains no errors.