2.6 add jetty graceful shutdown

org.restlet.java/org.restlet.ext.jetty/README.md

@@ -0,0 +1,32 @@
+# Debug Jetty
+
+## Add full logs
+
+[Jetty's documentation](https://jetty.org/docs/jetty/12/programming-guide/troubleshooting/logging.html) (the `org.eclipse.jetty:jetty-slf4j-impl`is already added to the `pom.xml`).
+
+Programmatically:
+```
+System.setProperty("org.eclipse.jetty.LEVEL", "TRACE");
+```
+
+Or add a `jetty-logging.properties`:
+```
+org.eclipse.jetty.LEVEL=TRACE
+org.eclipse.jetty.client.LEVEL=TRACE
+```
+
+## Debug using JMX
+You need to update the current implementation by hand.
+
+- [activate JMX](https://jetty.org/docs/jetty/12/programming-guide/arch/jmx.html)
+The Jetty server is created in class `JettyServerHelper`.
+
+```
+        // Create an MBeanContainer with the platform MBeanServer.
+        MBeanContainer mbeanContainer = new MBeanContainer(ManagementFactory.getPlatformMBeanServer());
+        // Add MBeanContainer to the root component.
+        jettyServer.addBean(mbeanContainer);
+```
+
+- to [state tracking](https://jetty.org/docs/jetty/12/programming-guide/troubleshooting/state-tracking.html)
+  You can use [jconsole](https://docs.oracle.com/javase/8/docs/technotes/guides/management/jconsole.html) to check the state of MBean or just run operations on them.

org.restlet.java/org.restlet.ext.jetty/pom.xml

@@ -45,6 +45,11 @@
 			<artifactId>jetty-http3-client-transport</artifactId>
 			<version>${lib-jetty-version}</version>
 		</dependency>
+		<dependency>
+			<groupId>org.eclipse.jetty</groupId>
+			<artifactId>jetty-slf4j-impl</artifactId>
+			<version>${lib-jetty-version}</version>
+		</dependency>
 		<dependency>
 			<groupId>org.restlet</groupId>
 			<artifactId>org.restlet</artifactId>