[CAMEL-15357]Add example for Karaf to demonstrate how REST endpoint using servlet secured by Karaf JAAS service
diff --git a/examples/camel-example-servlet-rest-karaf-jaas/README.adoc b/examples/camel-example-servlet-rest-karaf-jaas/README.adoc
new file mode 100644
index 0000000..d4e7e67
--- /dev/null
+++ b/examples/camel-example-servlet-rest-karaf-jaas/README.adoc
@@ -0,0 +1,90 @@
+== Camel Servlet REST and Karaf Jaas example
+
+=== Introduction
+
+This example shows how to use Servlet REST to define REST endpoints in Camel routes using the Rest DSL. REST endpoint protected by Basic Auth, delegate user/password authentication to Karaf Jaas Service
+
+=== Build
+
+You will need to compile this example first:
+
+....
+mvn install
+....
+
+=== Copy security configuration file
+        copy src/main/resources/org.ops4j.pax.web.context-camelrestdsl.cfg
+        to $KARAF_HOME/etc folder
+
+=== Run
+
+To install Apache Camel in Karaf you type in the shell (we use version
+$\{camel.version}):
+
+....
+feature:repo-add camel ${camel.version}
+feature:install camel
+....
+
+First you need to install the following features in Karaf/ServiceMix
+with:
+
+....
+feature:install camel-servlet
+feature:install camel-jackson
+feature:install war
+....
+
+Then you can install the Camel example:
+
+....
+install -s mvn:org.apache.camel.example/camel-example-servlet-rest-karaf-jaas/${camel.version}
+....
+
+And you can see the application running by tailing the logs
+
+....
+log:tail
+....
+
+And you can use ctrl+c to stop tailing the log.
+
+There is a user REST service that supports the following operations
+
+* GET /user/\{id} - to view a user with the given id
+* GET /user/final - to view all users
+* PUT /user - to update/create an user
+
+The view operations are HTTP GET, and update is using HTTP PUT.
+
+From a web browser you can access the first two services using the
+following links(need to input karaf/karaf as user/password in the pop up dialog)
+
+....
+  http://localhost:8181/camel-example-servlet-rest-blueprint/rest/user/123    - to view the user with id 123
+  http://localhost:8181/camel-example-servlet-rest-blueprint/rest/user/findAll   - to list all users
+....
+
+From the command shell you can use curl to access the service as shown
+below:
+
+....
+curl -X GET -H "Accept: application/json" --basic -u karaf:karaf http://localhost:8181/camel-example-servlet-rest-blueprint/rest/user/123
+curl -X GET -H "Accept: application/json" --basic -u karaf:karaf http://localhost:8181/camel-example-servlet-rest-blueprint/rest/user/findAll
+curl -X PUT -d "{ \"id\": 666, \"name\": \"The devil\"}" -H "Accept: application/json" --basic -u karaf:karaf http://localhost:8181/camel-example-servlet-rest-blueprint/rest/user
+....
+
+=== Configuration
+
+This example is implemented in XML DSL in the
+`+src/main/resources/OSGI-INF/blueprint/camel.xml+` file.
+
+=== Help and contributions
+
+If you hit any problem using Camel or have some feedback, then please
+https://camel.apache.org/support.html[let us know].
+
+We also love contributors, so
+https://camel.apache.org/contributing.html[get involved] :-)
+
+The Camel riders!
diff --git a/examples/camel-example-servlet-rest-karaf-jaas/pom.xml b/examples/camel-example-servlet-rest-karaf-jaas/pom.xml
new file mode 100644
index 0000000..1b62472
--- /dev/null
+++ b/examples/camel-example-servlet-rest-karaf-jaas/pom.xml
@@ -0,0 +1,109 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Licensed to the Apache Software Foundation (ASF) under one or more
+    contributor license agreements.  See the NOTICE file distributed with
+    this work for additional information regarding copyright ownership.
+    The ASF licenses this file to You 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.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.apache.camel.example</groupId>
+        <artifactId>examples</artifactId>
+        <version>3.5.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>camel-example-servlet-rest-karaf-jaas</artifactId>
+    <name>Camel :: Example :: Servlet REST :: Karaf Jaas</name>
+    <description>An example using Servlet REST with OSGi Blueprint, and REST endpoint protected by Basic Auth, delegate user/password authentication to Karaf Jaas Service</description>
+    <packaging>jar</packaging>
+
+
+    <properties>
+        <category>OSGi</category>
+        <title>Servlet REST Blueprint</title>
+
+        <camel.osgi.import.pkg>
+            *
+        </camel.osgi.import.pkg>
+        <camel.osgi.export.pkg>
+            *
+        </camel.osgi.export.pkg>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <!-- Add Camel BOM -->
+            <dependency>
+                <groupId>org.apache.camel</groupId>
+                <artifactId>camel-bom</artifactId>
+                <version>${camel.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+
+        <!-- camel -->
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.camel.karaf</groupId>
+            <artifactId>camel-blueprint</artifactId>
+            <version>${camel.karaf.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-servlet</artifactId>
+        </dependency>
+        <!--<dependency>-->
+        <!--<groupId>org.apache.camel</groupId>-->
+        <!--<artifactId>camel-swagger</artifactId>-->
+        <!--</dependency>-->
+
+        <!-- use for json binding -->
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-jackson</artifactId>
+        </dependency>
+
+        <!-- logging -->
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-api</artifactId>
+            <version>${log4j2-version}</version>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>${log4j2-version}</version>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+            <version>${log4j2-version}</version>
+            <scope>runtime</scope>
+        </dependency>
+    </dependencies>
+
+</project>
diff --git a/examples/camel-example-servlet-rest-karaf-jaas/src/main/java/org/apache/camel/example/rest/User.java b/examples/camel-example-servlet-rest-karaf-jaas/src/main/java/org/apache/camel/example/rest/User.java
new file mode 100644
index 0000000..4fd237b
--- /dev/null
+++ b/examples/camel-example-servlet-rest-karaf-jaas/src/main/java/org/apache/camel/example/rest/User.java
@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.camel.example.rest;
+
+public class User {
+
+    private int id;
+    private String name;
+
+    public User() {
+    }
+
+    public User(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}
diff --git a/examples/camel-example-servlet-rest-karaf-jaas/src/main/java/org/apache/camel/example/rest/UserService.java b/examples/camel-example-servlet-rest-karaf-jaas/src/main/java/org/apache/camel/example/rest/UserService.java
new file mode 100644
index 0000000..1ad0b50
--- /dev/null
+++ b/examples/camel-example-servlet-rest-karaf-jaas/src/main/java/org/apache/camel/example/rest/UserService.java
@@ -0,0 +1,63 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.camel.example.rest;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.TreeMap;
+
+/**
+ * A {@link org.apache.camel.example.rest.User} service which we rest enable from the {@link org.apache.camel.example.rest.UserRouteBuilder}.
+ */
+public class UserService {
+
+    // use a tree map so they become sorted
+    private final Map<String, User> users = new TreeMap<>();
+
+    public UserService() {
+        users.put("123", new User(123, "John Doe"));
+        users.put("456", new User(456, "Donald Duck"));
+    }
+
+    /**
+     * Gets a user by the given id
+     *
+     * @param id  the id of the user
+     * @return the user, or <tt>null</tt> if no user exists
+     */
+    public User getUser(String id) {
+        return users.get(id);
+    }
+
+    /**
+     * List all users
+     *
+     * @return the list of all users
+     */
+    public Collection<User> listUsers() {
+        return users.values();
+    }
+
+    /**
+     * Updates or creates the given user
+     *
+     * @param user the user
+     */
+    public void updateUser(User user) {
+        users.put("" + user.getId(), user);
+    }
+}
diff --git a/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/META-INF/LICENSE.txt b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/META-INF/LICENSE.txt
new file mode 100644
index 0000000..6b0b127
--- /dev/null
+++ b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/META-INF/LICENSE.txt
@@ -0,0 +1,203 @@
+
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diff --git a/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/META-INF/NOTICE.txt b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/META-INF/NOTICE.txt
new file mode 100644
index 0000000..2e215bf
--- /dev/null
+++ b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/META-INF/NOTICE.txt
@@ -0,0 +1,11 @@
+   =========================================================================
+   ==  NOTICE file corresponding to the section 4 d of                    ==
+   ==  the Apache License, Version 2.0,                                   ==
+   ==  in this case for the Apache Camel distribution.                    ==
+   =========================================================================
+
+   This product includes software developed by
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+
+   Please read the different LICENSE files present in the licenses directory of
+   this distribution.
diff --git a/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/OSGI-INF/blueprint/camel.xml b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/OSGI-INF/blueprint/camel.xml
new file mode 100644
index 0000000..e630bca
--- /dev/null
+++ b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/OSGI-INF/blueprint/camel.xml
@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Licensed to the Apache Software Foundation (ASF) under one or more
+    contributor license agreements.  See the NOTICE file distributed with
+    this work for additional information regarding copyright ownership.
+    The ASF licenses this file to You 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.
+
+-->
+<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
+           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+           xsi:schemaLocation="
+           http://www.osgi.org/xmlns/blueprint/v1.0.0 https://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">
+
+  <!-- to setup camel servlet with OSGi HttpService -->
+  <reference id="httpService" interface="org.osgi.service.http.HttpService"/>
+
+  <bean class="org.apache.camel.component.servlet.osgi.OsgiServletRegisterer"
+        init-method="register"
+        destroy-method="unregister">
+    <property name="alias" value="/camel-example-servlet-rest-blueprint/rest"/>
+    <property name="httpService" ref="httpService"/>
+    <property name="servlet" ref="camelServlet"/>
+  </bean>
+
+  <bean id="camelServlet" class="org.apache.camel.component.servlet.CamelHttpTransportServlet"/>
+
+  <!-- a bean for user services -->
+  <bean id="userService" class="org.apache.camel.example.rest.UserService"/>
+
+  <camelContext xmlns="http://camel.apache.org/schema/blueprint">
+
+    <!-- configure rest to use the camel-servlet component, and use json binding mode -->
+    <!-- and tell to output json in pretty print mode -->
+    <!-- setup context path and port number that Apache Tomcat will deploy this application with,
+         as we use the servlet component, then we need to aid Camel to tell it these details so Camel
+         knows the url to the REST services.
+         Notice: This is optional, but needed if the RestRegistry should enlist accurate information.
+         You can access the RestRegistry from JMX at runtime -->
+    <restConfiguration component="servlet" bindingMode="json" contextPath="/camel-example-servlet-rest-blueprint/rest"
+                       port="8181">
+      <dataFormatProperty key="prettyPrint" value="true"/>
+    </restConfiguration>
+
+    <!-- defines the rest services using the context-path /user -->
+    <rest path="/user" consumes="application/json" produces="application/json">
+      <description>User rest service</description>
+
+      <!-- this is a rest GET to view an user by the given id -->
+      <get uri="/{id}" outType="org.apache.camel.example.rest.User">
+        <description>Find user by id</description>
+        <to uri="bean:userService?method=getUser(${header.id})"/>
+      </get>
+
+      <!-- this is a rest PUT to create/update an user -->
+      <put type="org.apache.camel.example.rest.User">
+        <description>Updates or create a user</description>
+        <to uri="bean:userService?method=updateUser"/>
+      </put>
+
+      <!-- this is a rest GET to find all users -->
+      <get uri="/findAll" outType="org.apache.camel.example.rest.User[]">
+        <description>Find all users</description>
+        <to uri="bean:userService?method=listUsers"/>
+      </get>
+
+    </rest>
+
+  </camelContext>
+
+</blueprint>
\ No newline at end of file
diff --git a/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/log4j2.properties b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/log4j2.properties
new file mode 100644
index 0000000..9deb51c
--- /dev/null
+++ b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/log4j2.properties
@@ -0,0 +1,23 @@
+## ---------------------------------------------------------------------------
+## Licensed to the Apache Software Foundation (ASF) under one or more
+## contributor license agreements.  See the NOTICE file distributed with
+## this work for additional information regarding copyright ownership.
+## The ASF licenses this file to You 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.
+## ---------------------------------------------------------------------------
+
+appender.console.type = Console
+appender.console.name = console
+appender.console.layout.type = PatternLayout
+appender.console.layout.pattern = %d [%-15.15t] %-5p %-30.30c{1} - %m%n
+rootLogger.level = INFO
+rootLogger.appenderRef.console.ref = console
diff --git a/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/org.ops4j.pax.web.context-camelrestdsl.cfg b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/org.ops4j.pax.web.context-camelrestdsl.cfg
new file mode 100644
index 0000000..5dd68fe
--- /dev/null
+++ b/examples/camel-example-servlet-rest-karaf-jaas/src/main/resources/org.ops4j.pax.web.context-camelrestdsl.cfg
@@ -0,0 +1,7 @@
+bundle.symbolicName=camel-example-servlet-rest-blueprint
+login.config.authMethod=BASIC
+login.config.realmName=karaf
+context.id=default
+
+security.constraint.1.url = /camel-example-servlet-rest-blueprint/*
+security.constraint.1.roles = admin
diff --git a/examples/pom.xml b/examples/pom.xml
index c37d44f..bef939c 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -149,6 +149,7 @@
         <module>camel-example-salesforce-consumer</module>
         <module>camel-example-servlet-rest-blueprint</module>
         <module>camel-example-servlet-tomcat</module>
+        <module>camel-example-servlet-rest-karaf-jaas</module>
         <module>camel-example-splunk</module>
         <module>camel-example-spring</module>
         <module>camel-example-spring-javaconfig</module>