2 files changed, 13 insertions, 8 deletions
diff --git a/src/newt/classes/com/jogamp/newt/MonitorDevice.java b/src/newt/classes/com/jogamp/newt/MonitorDevice.java
index 9c12dcb58..ec38ce3c3 100644
--- a/src/newt/classes/com/jogamp/newt/MonitorDevice.java
+++ b/src/newt/classes/com/jogamp/newt/MonitorDevice.java
@@ -35,7 +35,6 @@ import com.jogamp.nativewindow.util.DimensionImmutable;
 import com.jogamp.nativewindow.util.Rectangle;
 import com.jogamp.nativewindow.util.RectangleImmutable;
 import com.jogamp.nativewindow.util.SurfaceSize;
-
 import com.jogamp.common.util.ArrayHashSet;
 
 /**
@@ -317,16 +316,18 @@ public abstract class MonitorDevice {
      * <p>
      * The returned {@link MonitorMode} is element of the lists {@link #getSupportedModes()} and {@link Screen#getMonitorModes()}.
      * </p>
+     * @throws IllegalStateException if the {@link #getScreen() associated screen} is not {@link Screen#isNativeValid() valid natively}.
      * @see #getCurrentMode()
      */
-    public abstract MonitorMode queryCurrentMode();
+    public abstract MonitorMode queryCurrentMode() throws IllegalStateException;
 
     /**
      * Set the current {@link com.jogamp.newt.MonitorMode}.
      * @param mode to be made current, must be element of the list {@link #getSupportedModes()} and {@link Screen#getMonitorModes()}.
      * @return true if successful, otherwise false
+     * @throws IllegalStateException if the {@link #getScreen() associated screen} is not {@link Screen#isNativeValid() valid natively}.
      */
-    public abstract boolean setCurrentMode(MonitorMode mode);
+    public abstract boolean setCurrentMode(MonitorMode mode) throws IllegalStateException;
 
     @Override
     public String toString() {
diff --git a/src/newt/classes/jogamp/newt/MonitorDeviceImpl.java b/src/newt/classes/jogamp/newt/MonitorDeviceImpl.java
index 138aedc29..3f039a9f4 100644
--- a/src/newt/classes/jogamp/newt/MonitorDeviceImpl.java
+++ b/src/newt/classes/jogamp/newt/MonitorDeviceImpl.java
@@ -28,8 +28,6 @@
 
 package jogamp.newt;
 
-import java.util.ArrayList;
-
 import com.jogamp.nativewindow.ScalableSurface;
 import com.jogamp.nativewindow.util.DimensionImmutable;
 import com.jogamp.nativewindow.util.Rectangle;
@@ -59,8 +57,11 @@ public class MonitorDeviceImpl extends MonitorDevice {
     }
 
     @Override
-    public final MonitorMode queryCurrentMode() {
+    public final MonitorMode queryCurrentMode() throws IllegalStateException {
         final ScreenImpl screenImpl = (ScreenImpl)screen;
+        if( !screenImpl.isNativeValid() ) {
+            throw new IllegalStateException("Screen is not created natively: "+screenImpl);
+        }
         final ScreenMonitorState sms = screenImpl.getScreenMonitorStatus(true);
         sms.lock();
         try {
@@ -89,11 +90,14 @@ public class MonitorDeviceImpl extends MonitorDevice {
     }
 
     @Override
-    public final boolean setCurrentMode(final MonitorMode mode) {
+    public final boolean setCurrentMode(final MonitorMode mode) throws IllegalStateException {
+        final ScreenImpl screenImpl = (ScreenImpl)screen;
+        if( !screenImpl.isNativeValid() ) {
+            throw new IllegalStateException("Screen is not created natively: "+screenImpl);
+        }
         if(Screen.DEBUG) {
             System.err.println("Screen.setCurrentMode.0: "+this+" -> "+mode);
         }
-        final ScreenImpl screenImpl = (ScreenImpl)screen;
         final ScreenMonitorState sms = screenImpl.getScreenMonitorStatus(true);
         sms.lock();
         try {