Support Jetty 9.4 and upgrade to 9.4.0.v20161208

Update `JettyEmbeddedServletContainerFactory` to support Jetty 9.4
directly and Jetty 9.3 via reflection. The primary difference between
Jetty 9.3 and 9.4 are the session management classes. Websocket suppport
has also been updates, but this is handled transparently by the
Spring Framework support.

Fixes gh-7599

spring-boot-samples/spring-boot-sample-jetty93/src/test/java/sample/jetty93/SampleJettyApplicationTests.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2012-2016 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.jetty93;
+
+import java.io.ByteArrayInputStream;
+import java.nio.charset.Charset;
+import java.util.zip.GZIPInputStream;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.util.StreamUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Basic integration tests for demo application.
+ *
+ * @author Dave Syer
+ * @author Andy Wilkinson
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
+@DirtiesContext
+public class SampleJettyApplicationTests {
+
+	@Autowired
+	private TestRestTemplate restTemplate;
+
+	@Test
+	public void testHome() throws Exception {
+		ResponseEntity<String> entity = this.restTemplate.getForEntity("/", String.class);
+		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+		assertThat(entity.getBody()).isEqualTo("Hello World");
+	}
+
+	@Test
+	public void testCompression() throws Exception {
+		HttpHeaders requestHeaders = new HttpHeaders();
+		requestHeaders.set("Accept-Encoding", "gzip");
+		HttpEntity<?> requestEntity = new HttpEntity<Object>(requestHeaders);
+
+		ResponseEntity<byte[]> entity = this.restTemplate.exchange("/", HttpMethod.GET,
+				requestEntity, byte[].class);
+
+		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+		GZIPInputStream inflater = new GZIPInputStream(
+				new ByteArrayInputStream(entity.getBody()));
+		try {
+			assertThat(StreamUtils.copyToString(inflater, Charset.forName("UTF-8")))
+					.isEqualTo("Hello World");
+		}
+		finally {
+			inflater.close();
+		}
+	}
+
+}