This error is thrown whenever an unrecoverable error occurs internally in SWT. The message text and error code provide a further description of the problem. The exception has a throwable field which holds the underlying throwable that caused the problem (if this information is available (i.e. it may be null)).

SWTErrors are thrown when something fails internally which either leaves SWT in an unknown state (eg. the o/s call to remove an item from a list returns an error code) or when SWT is left in a known-to-be-unrecoverable state (eg. it runs out of callback resources). SWTErrors should not occur in typical programs, although "high reliability" applications should still catch them.

This class also provides support methods used by SWT to match error codes to the appropriate exception class (SWTError, SWTException, or IllegalArgumentException) and to provide human readable strings for SWT error codes.