diff -r 46cc97095e0a facestester-connector-mojarra-jsf1.2/src/main/java/com/steeplesoft/jsf/facestester/context/mojarra/MojarraFacesContextBuilder.java
--- a/facestester-connector-mojarra-jsf1.2/src/main/java/com/steeplesoft/jsf/facestester/context/mojarra/MojarraFacesContextBuilder.java	Mon Sep 07 15:04:47 2009 -0500
+++ b/facestester-connector-mojarra-jsf1.2/src/main/java/com/steeplesoft/jsf/facestester/context/mojarra/MojarraFacesContextBuilder.java	Fri Sep 18 08:08:00 2009 +0200
@@ -71,8 +71,10 @@
             throw new FacesTesterException("Mojarra's ConfigureListener was found, but could not be instantiated: " + ex.getLocalizedMessage(), ex);
         }
 
-        servletContext.setInitParameter(WebContextInitParameter.ExpressionFactory.getQualifiedName(),
-                WebContextInitParameter.ExpressionFactory.getDefaultValue());
+	if (servletContext.getInitParameter(WebContextInitParameter.ExpressionFactory.getQualifiedName()) == null) {
+		servletContext.setInitParameter(WebContextInitParameter.ExpressionFactory.getQualifiedName(),
+			WebContextInitParameter.ExpressionFactory.getDefaultValue());
+	}
 
         initializeFaces(servletContext);
         facesContextFactory = (FacesContextFactory) FactoryFinder.getFactory(FACES_CONTEXT_FACTORY);