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GH Issue 1631: ViewContext.getString() - #8118
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## Rationale `ViewContext.getString()` is safer than blindly casting ## Related Pull Requests - LabKey/platform#8118
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Rationale
Stop repeated URL parameters from causing unhandled ClassCastExceptions (GH Issue 1631).
Changes
ViewContext.getString()which checks the value type before returning it. It returnsnullor aString, or else it throws a clearBadRequestException, which avoids logging and mothership reporting.StudyController,ReportsController,AnnouncementsController, etc.ViewContext.get(String)and deprecateViewContext.get(Object)