3 files changed, 9 insertions, 0 deletions
diff --git a/src/newt/classes/jogamp/newt/DisplayImpl.java b/src/newt/classes/jogamp/newt/DisplayImpl.java
index f2f35135a..a0bbcc264 100644
--- a/src/newt/classes/jogamp/newt/DisplayImpl.java
+++ b/src/newt/classes/jogamp/newt/DisplayImpl.java
@@ -70,6 +70,9 @@ public abstract class DisplayImpl extends Display {
                 throw new RuntimeException("Unknown display type \"" + type + "\"");
             }
         }
+        if(null==displayClass) {
+            throw new ClassNotFoundException("Failed to find NEWT Display Class <"+type+".Display>");            
+        }
         return displayClass;
     }
 
diff --git a/src/newt/classes/jogamp/newt/ScreenImpl.java b/src/newt/classes/jogamp/newt/ScreenImpl.java
index 72f1b5a2c..cf614b6f1 100644
--- a/src/newt/classes/jogamp/newt/ScreenImpl.java
+++ b/src/newt/classes/jogamp/newt/ScreenImpl.java
@@ -111,6 +111,9 @@ public abstract class ScreenImpl extends Screen implements ScreenModeListener {
                 throw new RuntimeException("Unknown window type \"" + type + "\"");
             }
         }
+        if(null==screenClass) {
+            throw new ClassNotFoundException("Failed to find NEWT Screen Class <"+type+".Screen>");            
+        }
         return (Class<? extends Screen>)screenClass;
     }
 
diff --git a/src/newt/classes/jogamp/newt/WindowImpl.java b/src/newt/classes/jogamp/newt/WindowImpl.java
index 143e7c1ed..074f635e4 100644
--- a/src/newt/classes/jogamp/newt/WindowImpl.java
+++ b/src/newt/classes/jogamp/newt/WindowImpl.java
@@ -170,6 +170,9 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
                 throw new NativeWindowException("Unknown window type \"" + type + "\"");
             }
         }
+        if(null==windowClass) {
+            throw new ClassNotFoundException("Failed to find NEWT Window Class <"+type+".Window>");            
+        }
         return windowClass;
     }