Index: applications/editors/josm/plugins/poly/src/poly/PolyImporter.java
===================================================================
--- applications/editors/josm/plugins/poly/src/poly/PolyImporter.java	(revision 30357)
+++ applications/editors/josm/plugins/poly/src/poly/PolyImporter.java	(revision 30495)
@@ -20,5 +20,5 @@
 import org.openstreetmap.josm.gui.progress.ProgressMonitor;
 import org.openstreetmap.josm.io.IllegalDataException;
-import org.openstreetmap.josm.io.MirroredInputStream;
+import org.openstreetmap.josm.io.CachedFile;
 import org.openstreetmap.josm.io.OsmImporter;
 import org.openstreetmap.josm.tools.CheckParameterUtil;
@@ -36,5 +36,5 @@
 
     protected DataSet parseDataSet( final String source ) throws IOException, SAXException, IllegalDataException {
-        return parseDataSet(new MirroredInputStream(source), NullProgressMonitor.INSTANCE);
+        return parseDataSet(new CachedFile(source).getInputStream(), NullProgressMonitor.INSTANCE);
     }