diff --git a/org.eclipse.gemini.web.tomcat/src/main/java/org/eclipse/gemini/web/tomcat/internal/bundleresources/BundleWebResourceRoot.java b/org.eclipse.gemini.web.tomcat/src/main/java/org/eclipse/gemini/web/tomcat/internal/bundleresources/BundleWebResourceRoot.java
index 434ffdb..d645640 100644
--- a/org.eclipse.gemini.web.tomcat/src/main/java/org/eclipse/gemini/web/tomcat/internal/bundleresources/BundleWebResourceRoot.java
+++ b/org.eclipse.gemini.web.tomcat/src/main/java/org/eclipse/gemini/web/tomcat/internal/bundleresources/BundleWebResourceRoot.java
@@ -71,7 +71,7 @@
                     }
                 }
 
-                if (type.equals(ResourceSetType.CLASSES_JAR)) {
+                if (type.equals(ResourceSetType.CLASSES_JAR) && resourceSet != null) {
                     resourceSet.setClassLoaderOnly(true);
                 }
             }