diff --git a/build.xml b/build.xml
index bdb1903..ca97d2e 100644
--- a/build.xml
+++ b/build.xml
@@ -234,7 +234,8 @@
     <javac destdir="${build.dest.main}"
            debug="${debug}"
            optimize="${optimize}"
-           deprecation="${deprecation}">
+           deprecation="${deprecation}"
+           target="1.4">
         <src path="${build.src.main}"/>
         <patternset refid="jaxen.${object.model}"/>
     </javac>
@@ -244,7 +245,8 @@
     <javac destdir="${build.dest.test}"
            debug="${debug}"
            optimize="${optimize}"
-           deprecation="${deprecation}">
+           deprecation="${deprecation}"
+           target="1.4">
         <src path="${build.src.test}"/>
         <classpath path="${build.dest.test}"/>
         <classpath path="${build.dest.main}"/>
@@ -256,7 +258,8 @@
     <javac destdir="${build.dest.samples}"
            debug="${debug}"
            optimize="${optimize}"
-           deprecation="${deprecation}">
+           deprecation="${deprecation}"
+           target="1.4">
         <src path="${build.src.samples}"/>
         <classpath path="${build.dest.samples}"/>
         <classpath path="${build.dest.main}"/>
diff --git a/src/java/main/org/jaxen/dom/NamespaceNode.java b/src/java/main/org/jaxen/dom/NamespaceNode.java
index 42fc619..832b248 100644
--- a/src/java/main/org/jaxen/dom/NamespaceNode.java
+++ b/src/java/main/org/jaxen/dom/NamespaceNode.java
@@ -493,6 +493,54 @@ public class NamespaceNode implements Node
 			       "Namespace node may not be modified");
     }
 
+    public Object getUserData(String s) {
+        throw new UnsupportedOperationException();
+    }
+
+    public Object setUserData(String s, Object o, org.w3c.dom.UserDataHandler handler) {
+        throw new UnsupportedOperationException();
+    }
+
+    public Object getFeature(String s, String s2)  {
+        throw new UnsupportedOperationException();
+    }
+
+    public boolean isEqualNode(org.w3c.dom.Node node) {
+        throw new UnsupportedOperationException();
+    }
+
+    public String lookupNamespaceURI(String s) {
+        throw new UnsupportedOperationException();
+    }
+
+    public boolean isDefaultNamespace(String s) {
+        throw new UnsupportedOperationException();
+    }
+
+    public String lookupPrefix(String s) {
+        throw new UnsupportedOperationException();
+    }
+
+    public boolean isSameNode(org.w3c.dom.Node node) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void setTextContent(String s) {
+        throw new UnsupportedOperationException();
+    }
+
+    public String getTextContent() {
+        throw new UnsupportedOperationException();
+    }
+
+    public short compareDocumentPosition(org.w3c.dom.Node node) {
+        throw new UnsupportedOperationException();
+    }
+
+    public String getBaseURI() {
+        throw new UnsupportedOperationException();
+    }
+
 
 
     ////////////////////////////////////////////////////////////////////
diff --git a/src/java/main/org/jaxen/jdom/DocumentNavigator.java b/src/java/main/org/jaxen/jdom/DocumentNavigator.java
index 8955fcd..c414c3a 100644
--- a/src/java/main/org/jaxen/jdom/DocumentNavigator.java
+++ b/src/java/main/org/jaxen/jdom/DocumentNavigator.java
@@ -231,7 +231,7 @@ public class DocumentNavigator extends DefaultNavigator
                     nsMap.put( ns.getPrefix(), new XPathNamespace(elem, ns) );
             }
 
-            current = current.getParent();
+            current = (Element) current.getParent();
         }
 
         nsMap.put( "xml", new XPathNamespace(elem, Namespace.XML_NAMESPACE) );
@@ -458,7 +458,7 @@ public class DocumentNavigator extends DefaultNavigator
         }
         else if ( context instanceof Text )
         {
-            element = ((Text)context).getParent();
+            element = (Element) ((Text)context).getParent();
         }
         else if ( context instanceof Attribute )
         {
@@ -470,11 +470,11 @@ public class DocumentNavigator extends DefaultNavigator
         }
         else if ( context instanceof Comment )
         {
-            element = ((Comment)context).getParent();
+            element = (Element) ((Comment)context).getParent();
         }
         else if ( context instanceof ProcessingInstruction )
         {
-            element = ((ProcessingInstruction)context).getParent();
+            element = (Element) ((ProcessingInstruction)context).getParent();
         }
 
         if ( element != null )