460297 Use webapp classloader for infinispan deserialization

jetty-infinispan/src/main/java/org/eclipse/jetty/session/infinispan/WebAppMarshaller.java

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+//
+//  ========================================================================
+//  Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.session.infinispan;
+
+import org.infinispan.commons.marshall.jboss.AbstractJBossMarshaller;
+import org.jboss.marshalling.ContextClassResolver;
+
+
+/**
+ * WebAppMarshaller
+ *
+ * An implementation of the AbstractJBossMarshaller code that is just
+ * enough to provide a ContextClassResolver that will use the Thread Context Classloader
+ * in order to deserialize session attribute classes.  
+ * 
+ * This is necessary because the standard infinispan marshaller (GenericJBossMarshaller) uses the
+ * classloader of the loader that loaded itself. When using the infinispan module in Jetty, all of
+ * the infinispan classes will be on the container classpath. That means that the GenericJBossMarshaller
+ * returns the container classloader which is unable to load any webapp classes. This class ensures
+ * that it is always the webapp's classloader that will be used.
+ * 
+ * In order to use this class, you should put a hotrod-client.properties file into the
+ * ${jetty.base}/resources directory that contains this line:
+ * 
+ * infinispan.client.hotrod.marshaller=org.eclipse.jetty.session.infinispan.WebAppMarshaller
+ * 
+ * You will also need to add the following lines to a context xml file for your webapp to
+ * permit the webapp's classloader to see the org.eclipse.jetty.session.infinispan classes for
+ * the deserialization to work correctly:
+ * 
+ *  <Call name="prependServerClass">
+ *   <Arg>-org.eclipse.jetty.session.infinispan.</Arg>
+ * </Call>
+ *
+ */
+public class WebAppMarshaller extends AbstractJBossMarshaller 
+{
+
+    /**
+     * WebAppContextClassResolver
+     *
+     * Provides the Thread Context Classloader to use for deserializing.
+     * 
+     */
+    public static class WebAppContextClassResolver extends ContextClassResolver
+    {
+        public WebAppContextClassResolver ()
+        {
+            super();
+        }
+
+        @Override
+        protected ClassLoader getClassLoader()
+        {
+            return Thread.currentThread().getContextClassLoader();
+        }
+    }
+
+
+
+    public WebAppMarshaller ()
+    {
+        super();		
+        baseCfg.setClassResolver(new WebAppContextClassResolver());                         
+    }
+
+
+}