+try {
+ $success = $maintenance->execute();
+} catch ( Exception $ex ) {
+ $success = false;
+ while ( $ex ) {
+ $cls = get_class( $ex );
+ print "$cls from line {$ex->getLine()} of {$ex->getFile()}: {$ex->getMessage()}\n";
+ print $ex->getTraceAsString() . "\n";
+ $ex = $ex->getPrevious();
+ }
+}