diff --git a/src/main/java/eu/omp/irap/vespa/epntapclient/view/ParamField.java b/src/main/java/eu/omp/irap/vespa/epntapclient/view/ParamField.java
index b87899f..a6966ec 100644
--- a/src/main/java/eu/omp/irap/vespa/epntapclient/view/ParamField.java
+++ b/src/main/java/eu/omp/irap/vespa/epntapclient/view/ParamField.java
@@ -4,7 +4,6 @@ import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
-import java.beans.PropertyChangeEvent;
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
@@ -12,7 +11,6 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
-import java.util.Objects;
 
 import javax.swing.BoxLayout;
 import javax.swing.JComboBox;
@@ -20,12 +18,8 @@ import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.JTextField;
 import javax.swing.SwingUtilities;
-import javax.swing.event.ChangeEvent;
-import javax.swing.event.ChangeListener;
 import javax.swing.event.DocumentEvent;
 import javax.swing.event.DocumentListener;
-import javax.swing.text.Document;
-import javax.swing.text.JTextComponent;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -70,17 +64,17 @@ public abstract class ParamField extends JPanel {
 		this.paramName = paramName;
 	}
 
-	public static class StringField extends ParamField {
+	public static class StringField extends ParamField implements TextFieldListener {
 		JTextField field;
 
 		StringField(RequestView requestView, String paramName) {
 			super(requestView, paramName);
 			field = new JTextField();
-			addChangeListener(field, e -> onUpdate());
+			addChangeListener(this, field);
 			this.add(field);
 		}
 
-		private void onUpdate() {
+		public void update(JTextField field) {
 			if ("".equals(field.getText())) {
 				requestView.updateParam(paramName, null);
 			} else {
@@ -89,17 +83,17 @@ public abstract class ParamField extends JPanel {
 		}
 	}
 
-	public static class FloatField extends ParamField {
+	public static class FloatField extends ParamField implements TextFieldListener {
 		JTextField field;
 
 		FloatField(RequestView requestView, String paramName) {
 			super(requestView, paramName);
 			field = new JTextField();
-			addChangeListener(field, e -> onUpdate());
+			addChangeListener(this, field);
 			this.add(field);
 		}
 
-		private void onUpdate() {
+		public void update(JTextField field) {
 			if ("".equals(field.getText())) {
 				field.setBackground(Color.WHITE);
 				requestView.updateParam(paramName, null);
@@ -114,7 +108,7 @@ public abstract class ParamField extends JPanel {
 		}
 	}
 
-	public static class DateRangeField extends ParamField {
+	public static class DateRangeField extends ParamField implements TextFieldListener {
 		JTextField fieldMin;
 		JTextField fieldMax;
 
@@ -122,27 +116,29 @@ public abstract class ParamField extends JPanel {
 			super(requestView, paramName);
 			this.add(new JLabel("min "));
 			fieldMin = new JTextField();
+			fieldMin.setName(MIN_SUFFIX);
 			fieldMin.setPreferredSize(new Dimension(MIN_FIELD_WIDTH, FIELD_HEIGHT));
-			addChangeListener(fieldMin, e -> onUpdate(fieldMin, MIN_SUFFIX));
+			addChangeListener(this, fieldMin);
 			this.add(fieldMin);
 
 			this.add(new JLabel("max "));
 			fieldMax = new JTextField();
+			fieldMax.setName(MAX_SUFFIX);
 			fieldMax.setPreferredSize(new Dimension(MIN_FIELD_WIDTH, FIELD_HEIGHT));
-			addChangeListener(fieldMax, e -> onUpdate(fieldMax, MAX_SUFFIX));
+			addChangeListener(this, fieldMin);
 			this.add(fieldMax);
 		}
 
-		private void onUpdate(JTextField field, String suffix) {
+		public void update(JTextField field) {
 			DateFormat df = new SimpleDateFormat(DATE_FORMAT, Locale.ENGLISH);
 			if ("".equals(field.getText())) {
 				field.setBackground(Color.WHITE);
-				requestView.updateParam(paramName + suffix, null);
+				requestView.updateParam(paramName + field.getName(), null);
 			} else if (field.getText().matches(DATE_REGEX)) {
 				try {
 					long date = df.parse(field.getText()).getTime();
 					date = (Math.round((date / 86400000.0) + 2440587.5)); // to JD
-					requestView.updateParam(paramName + suffix, date);
+					requestView.updateParam(paramName + field.getName(), date);
 					field.setBackground(Color.WHITE);
 				} catch (ParseException e) {
 					field.setBackground(Color.PINK);
@@ -154,28 +150,31 @@ public abstract class ParamField extends JPanel {
 		}
 	}
 
-	public static class FloatRangeField extends ParamField {
+	public static class FloatRangeField extends ParamField implements TextFieldListener {
 		JTextField fieldMin;
 		JTextField fieldMax;
 
 		FloatRangeField(RequestView requestView, String paramName) {
 			super(requestView, paramName);
 			fieldMin = new JTextField();
-			addChangeListener(fieldMin, e -> onUpdate(fieldMin, MIN_SUFFIX));
+			fieldMin.setName(MIN_SUFFIX);
+			addChangeListener(this, fieldMin);
 			this.add(fieldMin);
 
 			fieldMax = new JTextField();
-			addChangeListener(fieldMax, e -> onUpdate(fieldMax, MAX_SUFFIX));
+			fieldMax.setName(MAX_SUFFIX);
+			addChangeListener(this, fieldMax);
 			this.add(fieldMax);
 		}
 
-		private void onUpdate(JTextField field, String suffix) {
+		public void update(JTextField field) {
 			if ("".equals(field.getText())) {
 				field.setBackground(Color.WHITE);
-				requestView.updateParam(paramName + suffix, null);
+				requestView.updateParam(paramName + field.getName(), null);
 			} else {
 				try {
-					requestView.updateParam(paramName + suffix, Float.parseFloat(field.getText()));
+					requestView.updateParam(paramName + field.getName(),
+							Float.parseFloat(field.getText()));
 					field.setBackground(Color.WHITE);
 				} catch (NumberFormatException e) {
 					field.setBackground(Color.PINK);
@@ -184,7 +183,7 @@ public abstract class ParamField extends JPanel {
 		}
 	}
 
-	public static class TargetNameField extends ParamField {
+	public static class TargetNameField extends ParamField implements TextFieldListener {
 		JComboBox<String> comboBox;
 		JTextField field;
 		String lastContent;
@@ -196,7 +195,7 @@ public abstract class ParamField extends JPanel {
 
 			comboBox.setEditable(true);
 			field = (JTextField) comboBox.getEditor().getEditorComponent();
-			addChangeListener(field, e -> onUpdate());
+			addChangeListener(this, field);
 			this.add(comboBox);
 		}
 
@@ -219,15 +218,21 @@ public abstract class ParamField extends JPanel {
 			return targetNames;
 		}
 
-		private void onUpdate() {
-			String content = field.getText();
-			if (content.length() >= 2 && !content.equals(lastContent)) {
-				lastContent = content;
-				int nbItems = comboBox.getItemCount();
+		Runnable updateComboBox = new Runnable() {
+			@Override
+			public void run() {
 				comboBox.removeAllItems();
-				for (String s : getItems(content)) {
+				for (String s : getItems(lastContent)) {
 					comboBox.addItem(s);
 				}
+			}
+		};
+
+		public void update(JTextField field) {
+			String content = field.getText();
+			if (content.length() >= 2 && !content.equals(lastContent)) {
+				lastContent = content;
+				SwingUtilities.invokeLater(updateComboBox);
 				field.setText(content);
 				requestView.updateParam(paramName, content);
 			}
@@ -303,50 +308,23 @@ public abstract class ParamField extends JPanel {
 		}
 	}
 
-	// public class EnumParamField extends ParamField {
-	// EnumParamField() {
-	// super();
-	// }
-	// }
-
-	public static void addChangeListener(JTextComponent text, ChangeListener changeListener) {
-		Objects.requireNonNull(text);
-		Objects.requireNonNull(changeListener);
-		DocumentListener dl = new DocumentListener() {
-			private int lastChange = 0, lastNotifiedChange = 0;
+	interface TextFieldListener {
+		void update(JTextField field);
+	}
 
-			@Override
-			public void insertUpdate(DocumentEvent e) {
-				changedUpdate(e);
+	static void addChangeListener(TextFieldListener changeListener, JTextField field) {
+		field.getDocument().addDocumentListener(new DocumentListener() {
+			public void removeUpdate(DocumentEvent de) {
+				changeListener.update(field);
 			}
 
-			@Override
-			public void removeUpdate(DocumentEvent e) {
-				changedUpdate(e);
+			public void insertUpdate(DocumentEvent de) {
+				changeListener.update(field);
 			}
 
-			@Override
-			public void changedUpdate(DocumentEvent e) {
-				lastChange++;
-				SwingUtilities.invokeLater(() -> {
-					if (lastNotifiedChange != lastChange) {
-						lastNotifiedChange = lastChange;
-						changeListener.stateChanged(new ChangeEvent(text));
-					}
-				});
+			public void changedUpdate(DocumentEvent de) {
+				changeListener.update(field);
 			}
-		};
-		text.addPropertyChangeListener("document", (PropertyChangeEvent e) -> {
-			Document d1 = (Document) e.getOldValue();
-			Document d2 = (Document) e.getNewValue();
-			if (d1 != null)
-				d1.removeDocumentListener(dl);
-			if (d2 != null)
-				d2.addDocumentListener(dl);
-			dl.changedUpdate(null);
 		});
-		Document d = text.getDocument();
-		if (d != null)
-			d.addDocumentListener(dl);
 	}
 }
\ No newline at end of file
--
libgit2 0.21.2