Index: src/test/java/org/infinispan/config/ConfigurationValidationTest.java
===================================================================
--- src/test/java/org/infinispan/config/ConfigurationValidationTest.java	(revision 0)
+++ src/test/java/org/infinispan/config/ConfigurationValidationTest.java	(revision 0)
@@ -0,0 +1,52 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2009, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.infinispan.config;
+
+import org.infinispan.manager.DefaultCacheManager;
+import org.testng.annotations.Test;
+
+/**
+ * ConfigurationValidationTest.
+ * 
+ * @author Sanne Grinovero
+ * @since 4.0
+ */
+@Test(groups = "functional", testName = "config.ConfigurationValidationTest")
+public class ConfigurationValidationTest {
+   
+   @Test//(expectedExceptions={org.infinispan.CacheException.class})
+   public void testWrongCachemodeConfiguration() {
+      GlobalConfiguration gc = GlobalConfiguration.getNonClusteredDefault();
+
+      Configuration config = new Configuration();
+      config.setCacheMode(Configuration.CacheMode.REPL_ASYNC);
+      
+      // it should be illegal to configure a non-clustered REPL_ASYNC
+      DefaultCacheManager cacheManager = new DefaultCacheManager(gc, config, true);
+      
+      //but cacheManager doesn't fail, the first put is failing with a NPE:
+      cacheManager.getCache().put("key", "value");
+      
+      cacheManager.stop();
+   }
+
+}