Initial spirng-session-data-geode setup.

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

samples/javaconfig/gemfire-p2p/src/main/java/sample/Config.java

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+/*
+ * 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.util.Properties;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.data.gemfire.CacheFactoryBean;
+import org.springframework.session.data.gemfire.config.annotation.web.http.EnableGemFireHttpSession;
+
+// tag::class[]
+@EnableGemFireHttpSession // <1>
+public class Config {
+
+	@Bean
+	Properties gemfireProperties() { // <2>
+		Properties gemfireProperties = new Properties();
+
+		gemfireProperties.setProperty("name", "GemFireP2PHttpSessionSample");
+		gemfireProperties.setProperty("mcast-port", "0");
+		gemfireProperties.setProperty("log-level",
+				System.getProperty("sample.httpsession.gemfire.log-level", "warning"));
+		gemfireProperties.setProperty("jmx-manager", "true");
+		gemfireProperties.setProperty("jmx-manager-start", "true");
+
+		return gemfireProperties;
+	}
+
+	@Bean
+	CacheFactoryBean gemfireCache() { // <3>
+		CacheFactoryBean gemfireCache = new CacheFactoryBean();
+
+		gemfireCache.setClose(true);
+		gemfireCache.setProperties(gemfireProperties());
+
+		return gemfireCache;
+	}
+}
+// end::class[]

samples/javaconfig/gemfire-p2p/src/main/java/sample/Initializer.java

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+/*
+ * 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 org.springframework.session.web.context.AbstractHttpSessionApplicationInitializer;
+
+// tag::class[]
+public class Initializer extends AbstractHttpSessionApplicationInitializer { // <1>
+
+	public Initializer() {
+		super(Config.class); // <2>
+	}
+}
+// end::class[]

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

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+/*
+ * 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.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+// tag::class[]
+@WebServlet("/session")
+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;
+}
+// tag::end[]

samples/javaconfig/gemfire-p2p/src/main/webapp/index.jsp

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+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%@ taglib prefix="wj" uri="http://www.webjars.org/tags" %>
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<title>Session Attributes</title>
+	<wj:locate path="bootstrap.min.css" relativeTo="META-INF/resources" var="bootstrapCssLocation"/>
+	<link rel="stylesheet" href="<c:url value="${bootstrapCssLocation}"/>">
+	<style type="text/css">
+		body {
+			padding: 1em;
+		}
+	</style>
+</head>
+<body>
+	<div class="container">
+		<h1>Description</h1>
+		<p>This application demonstrates how to use a GemFire instance to back your session. Notice that there is no JSESSIONID cookie. We are also able to customize the way of identifying what the requested session id is.</p>
+
+		<h1>Try it</h1>
+
+		<form class="form-inline" role="form" action="./session" method="post">
+			<label for="attributeName">Attribute Name</label>
+			<input id="attributeName" type="text" name="attributeName"/>
+			<label for="attributeValue">Attribute Value</label>
+			<input id="attributeValue" type="text" name="attributeValue"/>
+			<input type="submit" value="Set Attribute"/>
+		</form>
+
+		<hr/>
+
+		<table class="table table-striped">
+			<thead>
+			<tr>
+				<th>Attribute Name</th>
+				<th>Attribute Value</th>
+			</tr>
+			</thead>
+			<tbody>
+			<c:forEach items="${sessionScope}" var="attr">
+				<tr>
+					<td><c:out value="${attr.key}"/></td>
+					<td><c:out value="${attr.value}"/></td>
+				</tr>
+			</c:forEach>
+			</tbody>
+		</table>
+	</div>
+</body>
+</html>