Your form swallows the caught exception, but you manually capture the stack trace. Alternatively, you could preserve the underlying exception by passing it to the SnapDataException using this constructor:
SnapDataException(Document document, Throwable cause, String message);
Often times, the snap exception is written to the error view.
errorViews.write(snapDataException)
There is a write() which accepts a document too
errorViews.write(snapDataException, document)
The write will extract the underlying exception and stringify it, something like:
import com.google.common.base.Throwables;
Throwables.getStackTraceAsString( snapDataException.getCause() );
Throwables is a Guava class. Your vanilla Java approach works too – a bit more work. Anyway, the stack trace of the root exception should display in the error view.
