Initial spirng-session-data-geode setup.

(cherry picked from commit c5a1ee021016d37dda5e5eb96320ee1be9869314)
Signed-off-by: John Blum <jblum@pivotal.io>

samples/xml/gemfire-p2p/src/main/java/sample/SessionServlet.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2014-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sample;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+// tag::class[]
+public class SessionServlet extends HttpServlet {
+
+	@Override
+	protected void doPost(HttpServletRequest request, HttpServletResponse response)
+			throws ServletException, IOException {
+		String attributeName = request.getParameter("attributeName");
+		String attributeValue = request.getParameter("attributeValue");
+		request.getSession().setAttribute(attributeName, attributeValue);
+		response.sendRedirect(request.getContextPath() + "/");
+	}
+
+	private static final long serialVersionUID = 2878267318695777395L;
+}
+// end::class[]