diff --git a/source/net/sourceforge/filebot/format/AssociativeScriptObject.java b/source/net/sourceforge/filebot/format/AssociativeScriptObject.java
index a4bd2a8b..8f21f238 100644
--- a/source/net/sourceforge/filebot/format/AssociativeScriptObject.java
+++ b/source/net/sourceforge/filebot/format/AssociativeScriptObject.java
@@ -156,16 +156,13 @@ public class AssociativeScriptObject implements Scriptable {
 	 * Map allowing look-up of values by a fault-tolerant key as specified by the defining key.
 	 * 
 	 */
-	protected class LenientLookup extends AbstractMap<String, Object> {
+	private class LenientLookup extends AbstractMap<String, Object> {
 		
-		private final Map<String, Entry<String, Object>> source;
+		private final Map<String, Entry<String, Object>> source = new HashMap<String, Entry<String, Object>>();
 		
 
 		public LenientLookup(Map<String, Object> source) {
-			// initialize source map
-			this.source = new HashMap<String, Entry<String, Object>>(source.size());
-			
-			// populate source map
+			// populate entry map
 			for (Entry<String, Object> entry : source.entrySet()) {
 				this.source.put(definingKey(entry.getKey()), entry);
 			}
diff --git a/source/net/sourceforge/filebot/format/ExpressionFormat.java b/source/net/sourceforge/filebot/format/ExpressionFormat.java
index fea60dd1..fe3afcb5 100644
--- a/source/net/sourceforge/filebot/format/ExpressionFormat.java
+++ b/source/net/sourceforge/filebot/format/ExpressionFormat.java
@@ -4,10 +4,6 @@ package net.sourceforge.filebot.format;
 
 import java.io.FilePermission;
 import java.io.InputStreamReader;
-import java.lang.reflect.InvocationHandler;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.lang.reflect.Proxy;
 import java.security.AccessControlContext;
 import java.security.AccessControlException;
 import java.security.AccessController;
@@ -114,10 +110,12 @@ public class ExpressionFormat extends Format {
 	
 
 	public StringBuffer format(Bindings bindings, StringBuffer sb) {
-		ScriptContext context = new SimpleScriptContext();
-		
 		// use privileged bindings so we are not restricted by the script sandbox
-		context.setBindings(PrivilegedBindings.newProxy(bindings, AccessController.getContext()), ScriptContext.GLOBAL_SCOPE);
+		Bindings priviledgedBindings = PrivilegedInvocation.newProxy(Bindings.class, bindings, AccessController.getContext());
+		
+		// initialize script context with the privileged bindings
+		ScriptContext context = new SimpleScriptContext();
+		context.setBindings(priviledgedBindings, ScriptContext.GLOBAL_SCOPE);
 		
 		for (Object snipped : compilation) {
 			if (snipped instanceof CompiledScript) {
@@ -181,52 +179,6 @@ public class ExpressionFormat extends Format {
 	}
 	
 
-	private static class PrivilegedBindings implements InvocationHandler {
-		
-		private final Bindings bindings;
-		private final AccessControlContext context;
-		
-
-		private PrivilegedBindings(Bindings bindings, AccessControlContext context) {
-			this.bindings = bindings;
-			this.context = context;
-		}
-		
-
-		@Override
-		public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
-			try {
-				return AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
-					
-					@Override
-					public Object run() throws Exception {
-						return method.invoke(bindings, args);
-					}
-				}, context);
-			} catch (PrivilegedActionException e) {
-				Throwable cause = e.getException();
-				
-				// the underlying method may have throw an exception
-				if (cause instanceof InvocationTargetException) {
-					// get actual cause
-					cause = cause.getCause();
-				}
-				
-				// forward cause
-				throw cause;
-			}
-		}
-		
-
-		public static Bindings newProxy(Bindings bindings, AccessControlContext context) {
-			InvocationHandler invocationHandler = new PrivilegedBindings(bindings, context);
-			
-			// create dynamic invocation proxy
-			return (Bindings) Proxy.newProxyInstance(PrivilegedBindings.class.getClassLoader(), new Class[] { Bindings.class }, invocationHandler);
-		}
-	}
-	
-
 	private static class SecureCompiledScript extends CompiledScript {
 		
 		private final CompiledScript compiledScript;
diff --git a/source/net/sourceforge/filebot/format/PrivilegedInvocation.java b/source/net/sourceforge/filebot/format/PrivilegedInvocation.java
new file mode 100644
index 00000000..01120add
--- /dev/null
+++ b/source/net/sourceforge/filebot/format/PrivilegedInvocation.java
@@ -0,0 +1,59 @@
+
+package net.sourceforge.filebot.format;
+
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.security.AccessControlContext;
+import java.security.AccessController;
+import java.security.PrivilegedActionException;
+import java.security.PrivilegedExceptionAction;
+
+
+public class PrivilegedInvocation implements InvocationHandler {
+	
+	private final Object object;
+	private final AccessControlContext context;
+	
+
+	private PrivilegedInvocation(Object object, AccessControlContext context) {
+		this.object = object;
+		this.context = context;
+	}
+	
+
+	@Override
+	public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
+		try {
+			return AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
+				
+				@Override
+				public Object run() throws Exception {
+					return method.invoke(object, args);
+				}
+			}, context);
+		} catch (PrivilegedActionException e) {
+			Throwable cause = e.getException();
+			
+			// the underlying method may have throw an exception
+			if (cause instanceof InvocationTargetException) {
+				// get actual cause
+				cause = cause.getCause();
+			}
+			
+			// forward cause
+			throw cause;
+		}
+	}
+	
+
+	public static <I> I newProxy(Class<I> type, I object, AccessControlContext context) {
+		InvocationHandler invocationHandler = new PrivilegedInvocation(object, context);
+		ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
+		
+		// create dynamic invocation proxy
+		return type.cast(Proxy.newProxyInstance(classLoader, new Class[] { type }, invocationHandler));
+	}
+}