Check if screen's DisplayMode is not null.

src/net/java/sip/communicator/impl/neomedia/MediaServiceImpl.java

@@ -476,17 +476,17 @@ public ZrtpControl createZrtpControl()
     {
         return new ZrtpControlImpl();
     }
-    
+
     /**
      * Get available screens.
-     * 
+     *
      * @return screens
      */
     public List<ScreenDevice> getAvailableScreenDevices()
     {
       List<ScreenDevice> ret = new ArrayList<ScreenDevice>();
       ScreenDevice screens[] = ScreenDeviceImpl.getAvailableScreenDevice();
-       
+
         if(screens != null)
         {
             /* populates screen list */
@@ -497,7 +497,7 @@ public List<ScreenDevice> getAvailableScreenDevices()
         }
         return ret;
     }
-    
+
     /**
      * Get default screen device.
      *
@@ -509,19 +509,20 @@ public ScreenDevice getDefaultScreenDevice()
       ScreenDevice best = null;
       int width = 0;
       int height = 0;
-      
+
       for(ScreenDevice sc : screens)
       {
         java.awt.Dimension res = sc.getSize();
-        
-        if(width < res.getSize().width || height < res.getSize().height)
+
+        if(res != null && (width < res.getSize().width ||
+                height < res.getSize().height))
         {
           width = res.width;
           height = res.height;
           best = sc;
         }
       }
-      
+
       return best;
     }
 }

src/net/java/sip/communicator/impl/neomedia/device/ScreenDeviceImpl.java

@@ -12,7 +12,7 @@
 
 /**
  * Implementation of <tt>ScreenDevice</tt>.
- * 
+ *
  * @author Sebastien Vincent
  */
 public class ScreenDeviceImpl implements ScreenDevice
@@ -21,10 +21,10 @@ public class ScreenDeviceImpl implements ScreenDevice
      * AWT <tt>GraphicsDevice</tt>.
      */
     GraphicsDevice screen = null;
-    
+
     /**
      * Returns all available <tt>ScreenDevice</tt> device.
-     * 
+     *
      * @return array of <tt>ScreenDevice</tt> device
      */
     public static ScreenDevice[] getAvailableScreenDevice()
@@ -33,7 +33,7 @@ public static ScreenDevice[] getAvailableScreenDevice()
         GraphicsDevice devices[] = null;
         GraphicsEnvironment ge = null;
         int i = 0;
-        
+
         try
         {
             ge = GraphicsEnvironment.
@@ -43,31 +43,31 @@ public static ScreenDevice[] getAvailableScreenDevice()
         {
             ge = null;
         }
-        
+
         if(ge == null)
         {
             return null;
         }
 
         devices = ge.getScreenDevices();
-        
+
         if(devices == null || devices.length == 0)
         {
             return null;
         }
-        
+
         screens = new ScreenDevice[devices.length];
-        
+
         for(GraphicsDevice dev : devices)
         {
             /* we know that GraphicsDevice type is TYPE_RASTER_SCREEN */
             screens[i] = new ScreenDeviceImpl(dev);
             i++;
         }
-        
+
         return screens;
     }
-    
+
     /**
      * Constructor.
      *
@@ -77,17 +77,22 @@ protected ScreenDeviceImpl(GraphicsDevice screen)
     {
         this.screen = screen;
     }
-    
+
     /**
      * Get current resolution of <tt>ScreenDevice</tt> device.
-     * 
+     *
      * @return current resolution of the screen
      */
     public Dimension getSize()
     {
         /* get current display resolution */
         DisplayMode mode = screen.getDisplayMode();
-        return new Dimension(mode.getWidth(), mode.getHeight());
+
+        if(mode != null)
+        {
+            return new Dimension(mode.getWidth(), mode.getHeight());
+        }
+        return null;
     }
 }