Index: applications/editors/josm/plugins/terracer/src/terracer/HouseNumberInputHandler.java
===================================================================
--- applications/editors/josm/plugins/terracer/src/terracer/HouseNumberInputHandler.java	(revision 19085)
+++ applications/editors/josm/plugins/terracer/src/terracer/HouseNumberInputHandler.java	(revision 19129)
@@ -22,5 +22,5 @@
 import javax.swing.event.ChangeEvent;
 import javax.swing.event.ChangeListener;
-
+ 
 import org.openstreetmap.josm.data.osm.Way;
 
@@ -184,5 +184,5 @@
 			final String label, final StringBuffer message) {
 		final String content = field.getText();
-		if (content != null && !content.isEmpty()) {
+		if (content != null && content.length() != 0) {
 			try {
 				int i = Integer.parseInt(content);
@@ -216,5 +216,4 @@
 	 * @see javax.swing.event.ChangeListener#stateChanged(javax.swing.event.ChangeEvent)
 	 */
-	@Override
 	public void stateChanged(ChangeEvent e) {
 		validateInput();
@@ -225,5 +224,4 @@
 	 * @see java.awt.event.ItemListener#itemStateChanged(java.awt.event.ItemEvent)
 	 */
-	@Override
 	public void itemStateChanged(ItemEvent e) {
 		validateInput();
@@ -233,5 +231,4 @@
 	 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
 	 */
-	@Override
 	public void actionPerformed(final ActionEvent e) {
 
@@ -327,5 +324,4 @@
 	 * @see java.awt.event.FocusListener#focusGained(java.awt.event.FocusEvent)
 	 */
-	@Override
 	public void focusGained(FocusEvent e) {
 		validateInput();
@@ -335,5 +331,4 @@
 	 * @see java.awt.event.FocusListener#focusLost(java.awt.event.FocusEvent)
 	 */
-	@Override
 	public void focusLost(FocusEvent e) {
 		validateInput();