Jetty Component

The jetty component provides HTTP-based endpoints for consuming HTTP requests. That is, the Jetty component behaves as a simple Web server.
Jetty can also be used as a http client which mean you can also use it with Camel as a [Producer].

Upgrading from Jetty 6 to 7
You can read more about upgrading Jetty here
Stream
Jetty is stream based, which means the input it receives is submitted to Camel as a stream. That means you will only be able to read the content of the stream once.
If you find a situation where the message body appears to be empty or you need to access the data multiple times (eg: doing multicasting, or redelivery error handling)
you should use Stream caching or convert the message body to a String which is safe to be re-read multiple times.

URI format

jetty:http://hostname[:port][/resourceUri][?options]

You can append query options to the URI in the following format, ?option=value&option=value&...

Options

Name Default Value Description
sessionSupport false Specifies whether to enable the session manager on the server side of Jetty.
httpClient.XXX null Configuration of Jetty's HttpClient. For example, setting httpClient.idleTimeout=30000 sets the idle timeout to 30 seconds.
httpBindingRef null Reference to an org.apache.camel.component.http.HttpBinding in the Registry. HttpBinding can be used to customize how a response should be written.
jettyHttpBindingRef null Camel 2.6.0+: Reference to an org.apache.camel.component.jetty.JettyHttpBinding in the Registry. JettyHttpBinding can be used to customize how a response should be written.
matchOnUriPrefix false Whether or not the CamelServlet should try to find a target consumer by matching the URI prefix if no exact match is found. See here How do I let Jetty match wildcards.
handlers null Specifies a comma-delimited set of org.mortbay.jetty.Handler instances in your Registry (such as your Spring ApplicationContext). These handlers are added to the Jetty servlet context (for example, to add security).
chunked true Camel 2.2: If this option is false Jetty servlet will disable the HTTP streaming and set the content-length header on the response
enableJmx false Camel 2.3: If this option is true, Jetty JMX support will be enabled for this endpoint. See Jetty JMX support for more details.
disableStreamCache false Camel 2.3: Determines whether or not the raw input stream from Jetty is cached or not (Camel will read the stream into a in memory/overflow to file, Stream caching) cache. By default Camel will cache the Jetty input stream to support reading it multiple times to ensure it Camel can retrieve all data from the stream. However you can set this option to true when you for example need to access the raw stream, such as streaming it directly to a file or other persistent store. DefaultHttpBinding will copy the request input stream into a stream cache and put it into message body if this option is false to support reading the stream multiple times. If you use Jetty to bridge/proxy an endpoint then consider enabling this option to improve performance, in case you do not need to read the message payload multiple times.
bridgeEndpoint false Camel 2.1: If the option is true , HttpProducer will ignore the Exchange.HTTP_URI header, and use the endpoint's URI for request. You may also set the throwExceptionOnFailure to be false to let the HttpProducer send all the fault response back.
Camel 2.3: If the option is true, HttpProducer and CamelServlet will skip the gzip processing if the content-encoding is "gzip". Also consider setting disableStreamCache to true to optimize when bridging.
enableMultipartFilter true Camel 2.5: Whether Jetty org.eclipse.jetty.servlets.MultiPartFilter is enabled or not. You should set this value to false when bridging endpoints, to ensure multipart requests is proxied/bridged as well.
multipartFilterRef null Camel 2.6: Allows using a custom multipart filter. Note: setting multipartFilterRef forces the value of enableMultipartFilter to true.
FiltersRef null Camel 2.9: Allows using a custom filters which is putted into a list and can be find in the Registry
continuationTimeout null Camel 2.6: Allows to set a timeout in millis when using Jetty as consumer (server). By default Jetty uses 30000. You can use a value of <= 0 to never expire. If a timeout occurs then the request will be expired and Jetty will return back a http error 503 to the client. This option is only in use when using Jetty with the Asynchronous Routing Engine.
useContinuation true Camel 2.6: Whether or not to use Jetty continuations for the Jetty Server.
sslContextParametersRef
null
Camel 2.8: Reference to a org.apache.camel.util.jsse.SSLContextParameters in the Registry.  This reference overrides any configured SSLContextParameters at the component level.  See Using the JSSE Configuration Utility.
traceEnabled false Specifies whether to enable HTTP TRACE for this Jetty consumer. By default TRACE is turned off.

Message Headers

Camel uses the same message headers as the HTTP component.
From Camel 2.2, it also uses (Exchange.HTTP_CHUNKED,CamelHttpChunked) header to turn on or turn off the chuched encoding on the camel-jetty consumer.

Camel also populates all request.parameter and request.headers. For example, given a client request with the URL, http://myserver/myserver?orderid=123, the exchange will contain a header named orderid with the value 123.

Starting with Camel 2.2.0, you can get the request.parameter from the message header not only from Get Method, but also other HTTP method.

Usage

The Jetty component only supports consumer endpoints. Therefore a Jetty endpoint URI should be used only as the input for a Camel route (in a from() DSL call). To issue HTTP requests against other HTTP endpoints, use the HTTP Component

Component Options

The JettyHttpComponent provides the following options:

Name Default Value Description
enableJmx false Camel 2.3: If this option is true, Jetty JMX support will be enabled for this endpoint. See Jetty JMX support for more details.
sslKeyPassword null Consumer only: The password for the keystore when using SSL.
sslPassword null Consumer only: The password when using SSL.
sslKeystore null Consumer only: The path to the keystore.
minThreads null Camel 2.5 Consumer only: To set a value for minimum number of threads in server thread pool.
maxThreads null Camel 2.5 Consumer only: To set a value for maximum number of threads in server thread pool.
threadPool null Camel 2.5 Consumer only: To use a custom thread pool for the server.
sslSocketConnectors null Camel 2.3 Consumer only: A map which contains per port number specific SSL connectors. See section SSL support for more details.
socketConnectors null Camel 2.5 Consumer only: A map which contains per port number specific HTTP connectors. Uses the same principle as sslSocketConnectors and therefore see section SSL support for more details.
sslSocketConnectorProperties null Camel 2.5 Consumer only. A map which contains general SSL connector properties. See section SSL support for more details.
socketConnectorProperties null Camel 2.5 Consumer only. A map which contains general HTTP connector properties. Uses the same principle as sslSocketConnectorProperties and therefore see section SSL support for more details.
httpClient null Producer only: To use a custom HttpClient with the jetty producer.
httpClientMinThreads null Producer only: To set a value for minimum number of threads in HttpClient thread pool.
httpClientMaxThreads null Producer only: To set a value for maximum number of threads in HttpClient thread pool.
httpClientThreadPool null Producer only: To use a custom thread pool for the client.
sslContextParameters null Camel 2.8: To configure a custom SSL/TLS configuration options at the component level.  See  Using the JSSE Configuration Utility for more details.

Sample

In this sample we define a route that exposes a HTTP service at http://localhost:8080/myapp/myservice:

from("jetty:http://localhost:{{port}}/myapp/myservice").process(new MyBookService());
Usage of localhost
When you specify localhost in a URL, Camel exposes the endpoint only on the local TCP/IP network interface, so it cannot be accessed from outside the machine it operates on.

If you need to expose a Jetty endpoint on a specific network interface, the numerical IP address of this interface should be used as the host. If you need to expose a Jetty endpoint on all network interfaces, the 0.0.0.0 address should be used.

Our business logic is implemented in the MyBookService class, which accesses the HTTP request contents and then returns a response.
Note: The assert call appears in this example, because the code is part of an unit test.

public class MyBookService implements Processor {
    public void process(Exchange exchange) throws Exception {
        // just get the body as a string
        String body = exchange.getIn().getBody(String.class);

        // we have access to the HttpServletRequest here and we can grab it if we need it
        HttpServletRequest req = exchange.getIn().getBody(HttpServletRequest.class);
        assertNotNull(req);

        // for unit testing
        assertEquals("bookid=123", body);

        // send a html response
        exchange.getOut().setBody("<html><body>Book 123 is Camel in Action</body></html>");
    }
}

The following sample shows a content-based route that routes all requests containing the URI parameter, one, to the endpoint, mock:one, and all others to mock:other.

from("jetty:" + serverUri)
    .choice()
    .when().simple("${header.one}").to("mock:one")
    .otherwise()
    .to("mock:other");

So if a client sends the HTTP request, http://serverUri?one=hello, the Jetty component will copy the HTTP request parameter, one to the exchange's in.header. We can then use the simple language to route exchanges that contain this header to a specific endpoint and all others to another. If we used a language more powerful than Simple--such as EL or OGNL--we could also test for the parameter value and do routing based on the header value as well.

Session Support

The session support option, sessionSupport, can be used to enable a HttpSession object and access the session object while processing the exchange. For example, the following route enables sessions:

<route>
    <from uri="jetty:http://0.0.0.0/myapp/myservice/?sessionSupport=true"/>
    <processRef ref="myCode"/>
<route>

The myCode Processor can be instantiated by a Spring bean element:

<bean id="myCode"class="com.mycompany.MyCodeProcessor"/>

Where the processor implementation can access the HttpSession as follows:

public void process(Exchange exchange) throws Exception {
    HttpSession session = exchange.getIn(HttpMessage.class).getRequest().getSession();
    ...
}

SSL Support (HTTPS)

Using the JSSE Configuration Utility

As of Camel 2.8, the Jetty component supports SSL/TLS configuration through the Camel JSSE Configuration Utility.  This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels.  The following examples demonstrate how to use the utility with the Jetty component.

Programmatic configuration of the component
KeyStoreParameters ksp = new KeyStoreParameters();
ksp.setResource("/users/home/server/keystore.jks");
ksp.setPassword("keystorePassword");

KeyManagersParameters kmp = new KeyManagersParameters();
kmp.setKeyStore(ksp);
kmp.setKeyPassword("keyPassword");

SSLContextParameters scp = new SSLContextParameters();
scp.setKeyManagers(kmp);

JettyComponent jettyComponent = getContext().getComponent("jetty", JettyComponent.class);
jettyComponent.setSslContextParameters(scp);
Spring DSL based configuration of endpoint
...
  <camel:sslContextParameters
      id="sslContextParameters">
    <camel:keyManagers
        keyPassword="keyPassword">
      <camel:keyStore
          resource="/users/home/server/keystore.jks"
          password="keystorePassword"/>
    </camel:keyManagers>
  </camel:sslContextParameters>...
...
  <to uri="jetty:https://127.0.0.1/mail/?sslContextParametersRef=sslContextParameters"/>
...
Configuring Jetty Directly

Jetty provides SSL support out of the box. To enable Jetty to run in SSL mode, simply format the URI with the https:// prefix---for example:

<from uri="jetty:https://0.0.0.0/myapp/myservice/"/>

Jetty also needs to know where to load your keystore from and what passwords to use in order to load the correct SSL certificate. Set the following JVM System Properties:

until Camel 2.2

  • jetty.ssl.keystore specifies the location of the Java keystore file, which contains the Jetty server's own X.509 certificate in a key entry. A key entry stores the X.509 certificate (effectively, the public key) and also its associated private key.
  • jetty.ssl.password the store password, which is required to access the keystore file (this is the same password that is supplied to the keystore command's -storepass option).
  • jetty.ssl.keypassword the key password, which is used to access the certificate's key entry in the keystore (this is the same password that is supplied to the keystore command's -keypass option).

from Camel 2.3 onwards

  • org.eclipse.jetty.ssl.keystore specifies the location of the Java keystore file, which contains the Jetty server's own X.509 certificate in a key entry. A key entry stores the X.509 certificate (effectively, the public key) and also its associated private key.
  • org.eclipse.jetty.ssl.password the store password, which is required to access the keystore file (this is the same password that is supplied to the keystore command's -storepass option).
  • org.eclipse.jetty.ssl.keypassword the key password, which is used to access the certificate's key entry in the keystore (this is the same password that is supplied to the keystore command's -keypass option).

For details of how to configure SSL on a Jetty endpoint, read the following documentation at the Jetty Site: http://docs.codehaus.org/display/JETTY/How+to+configure+SSL

Some SSL properties aren't exposed directly by Camel, however Camel does expose the underlying SslSocketConnector, which will allow you to set properties like needClientAuth for mutual authentication requiring a client certificate or wantClientAuth for mutual authentication where a client doesn't need a certificate but can have one. There's a slight difference between the various Camel versions:

Up to Camel 2.2

<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="sslSocketConnectors">
        <map>
            <entry key="8043">
                <bean class="org.mortbay.jetty.security.SslSocketConnector">
                    <property name="password"value="..."/>
                    <property name="keyPassword"value="..."/>
                    <property name="keystore"value="..."/>
                    <property name="needClientAuth"value="..."/>
                    <property name="truststore"value="..."/>
                </bean>
            </entry>
        </map>
    </property>
</bean>

Camel 2.3, 2.4

<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="sslSocketConnectors">
        <map>
            <entry key="8043">
                <bean class="org.eclipse.jetty.server.ssl.SslSocketConnector">
                    <property name="password"value="..."/>
                    <property name="keyPassword"value="..."/>
                    <property name="keystore"value="..."/>
                    <property name="needClientAuth"value="..."/>
                    <property name="truststore"value="..."/>
                </bean>
            </entry>
        </map>
    </property>
</bean>

*From Camel 2.5 we switch to use SslSelectChannelConnector *

<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="sslSocketConnectors">
        <map>
            <entry key="8043">
                <bean class="org.eclipse.jetty.server.ssl.SslSelectChannelConnector">
                    <property name="password"value="..."/>
                    <property name="keyPassword"value="..."/>
                    <property name="keystore"value="..."/>
                    <property name="needClientAuth"value="..."/>
                    <property name="truststore"value="..."/>
                </bean>
            </entry>
        </map>
    </property>
</bean>

The value you use as keys in the above map is the port you configure Jetty to listen on.

Configuring general SSL properties

Available as of Camel 2.5

Instead of a per port number specific SSL socket connector (as shown above) you can now configure general properties which applies for all SSL socket connectors (which is not explicit configured as above with the port number as entry).

<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="sslSocketConnectorProperties">
        <properties>
            <property name="password"value="..."/>
            <property name="keyPassword"value="..."/>
            <property name="keystore"value="..."/>
            <property name="needClientAuth"value="..."/>
            <property name="truststore"value="..."/>
        </properties>
    </property>
</bean>

How to obtain reference to the X509Certificate

Jetty stores a reference to the certificate in the HttpServletRequest which you can access from code as follows:

HttpServletRequest req = exchange.getIn().getBody(HttpServletRequest.class);
X509Certificate cert = (X509Certificate) req.getAttribute("javax.servlet.request.X509Certificate")

Configuring general HTTP properties

Available as of Camel 2.5

Instead of a per port number specific HTTP socket connector (as shown above) you can now configure general properties which applies for all HTTP socket connectors (which is not explicit configured as above with the port number as entry).

<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="socketConnectorProperties">
        <properties>
            <property name="acceptors" value="4"/>
            <property name="maxIdleTime" value="300000"/>
        </properties>
    </property>
</bean>

Default behavior for returning HTTP status codes

The default behavior of HTTP status codes is defined by the org.apache.camel.component.http.DefaultHttpBinding class, which handles how a response is written and also sets the HTTP status code.

If the exchange was processed successfully, the 200 HTTP status code is returned.
If the exchange failed with an exception, the 500 HTTP status code is returned, and the stacktrace is returned in the body. If you want to specify which HTTP status code to return, set the code in the HttpProducer.HTTP_RESPONSE_CODE header of the OUT message.

Customizing HttpBinding

By default, Camel uses the org.apache.camel.component.http.DefaultHttpBinding to handle how a response is written. If you like, you can customize this behavior either by implementing your own HttpBinding class or by extending DefaultHttpBinding and overriding the appropriate methods.

The following example shows how to customize the DefaultHttpBinding in order to change how exceptions are returned:

public class MyJettyHttpBinding extends DefaultJettyHttpBinding {
    @Override
    protected void populateResponse(Exchange exchange, JettyContentExchange httpExchange, Message in,
                                    HeaderFilterStrategy strategy, int responseCode) throws IOException {

        Message answer = exchange.getOut();

        answer.setHeaders(in.getHeaders());
        answer.setHeader(Exchange.HTTP_RESPONSE_CODE, responseCode);
        answer.setBody("Not exactly the message the server returned.");
    }
}

We can then create an instance of our binding and register it in the Spring registry as follows:

<bean id="mybinding"class="com.mycompany.MyHttpBinding"/>

And then we can reference this binding when we define the route:

<route><from uri="jetty:http://0.0.0.0:8080/myapp/myservice?httpBindingRef=mybinding"/><to uri="bean:doSomething"/></route>

Jetty handlers and security configuration

You can configure a list of Jetty handlers on the endpoint, which can be useful for enabling advanced Jetty security features. These handlers are configured in Spring XML as follows:

<-- Jetty Security handling -->
<bean id="userRealm" class="org.mortbay.jetty.plus.jaas.JAASUserRealm">
    <property name="name" value="tracker-users"/>
    <property name="loginModuleName" value="ldaploginmodule"/>
</bean>

<bean id="constraint" class="org.mortbay.jetty.security.Constraint">
    <property name="name" value="BASIC"/>
    <property name="roles" value="tracker-users"/>
    <property name="authenticate" value="true"/>
</bean>

<bean id="constraintMapping" class="org.mortbay.jetty.security.ConstraintMapping">
    <property name="constraint" ref="constraint"/>
    <property name="pathSpec" value="/*"/>
</bean>

<bean id="securityHandler" class="org.mortbay.jetty.security.SecurityHandler">
    <property name="userRealm" ref="userRealm"/>
    <property name="constraintMappings" ref="constraintMapping"/>
</bean>

And from Camel 2.3 onwards you can configure a list of Jetty handlers as follows:

<-- Jetty Security handling -->
<bean id="constraint" class="org.eclipse.jetty.http.security.Constraint">
    <property name="name" value="BASIC"/>
    <property name="roles" value="tracker-users"/>
    <property name="authenticate" value="true"/>
</bean>

<bean id="constraintMapping" class="org.eclipse.jetty.security.ConstraintMapping">
    <property name="constraint" ref="constraint"/>
    <property name="pathSpec" value="/*"/>
</bean>

<bean id="securityHandler" class="org.eclipse.jetty.security.ConstraintSecurityHandler">
    <property name="authenticator">
        <bean class="org.eclipse.jetty.security.authentication.BasicAuthenticator"/>
    </property>
    <property name="constraintMappings">
        <list>
            <ref bean="constraintMapping"/>
        </list>
    </property>
</bean>

You can then define the endpoint as:

from("jetty:http://0.0.0.0:9080/myservice?handlers=securityHandler")

If you need more handlers, set the handlers option equal to a comma-separated list of bean IDs.

How to return a custom HTTP 500 reply message

You may want to return a custom reply message when something goes wrong, instead of the default reply message Camel Jetty replies with.
You could use a custom HttpBinding to be in control of the message mapping, but often it may be easier to use Camel's Exception Clause to construct the custom reply message. For example as show here, where we return Dude something went wrong with HTTP error code 500:

from("jetty://http://localhost:{{port}}/myserver")
    // use onException to catch all exceptions and return a custom reply message
    .onException(Exception.class)
        .handled(true)
        // create a custom failure response
        .transform(constant("Dude something went wrong"))
        // we must remember to set error code 500 as handled(true)
        // otherwise would let Camel thing its a OK response (200)
        .setHeader(Exchange.HTTP_RESPONSE_CODE, constant(500))
    .end()
    // now just force an exception immediately
    .throwException(new IllegalArgumentException("I cannot do this"));

Multi-part Form support

From Camel 2.3.0, camel-jetty support to multipart form post out of box. The submitted form-data are mapped into the message header. Camel-jetty creates an attachment for each uploaded file. The file name is mapped to the name of the attachment. The content type is set as the content type of the attachment file name. You can find the example here.

Note: getName() functions as shown below in versions 2.5 and higher. In earlier versions you receive the temporary file name for the attachment instead
// Set the jetty temp directory which store the file for multi part form
// camel-jetty will clean up the file after it handled the request.
// The option works rightly from Camel 2.4.0
getContext().getProperties().put("CamelJettyTempDir", "target");

from("jetty://http://localhost:{{port}}/test").process(new Processor() {

    public void process(Exchange exchange) throws Exception {
        Message in = exchange.getIn();
        assertEquals("Get a wrong attachement size", 1, in.getAttachments().size());
        // The file name is attachment id
        DataHandler data = in.getAttachment("NOTICE.txt");

        assertNotNull("Should get the DataHandle NOTICE.txt", data);
        // This assert is wrong, but the correct content-type (application/octet-stream)
        // will not be returned until Jetty makes it available - currently the content-type
        // returned is just the default for FileDataHandler (for the implentation being used)
        //assertEquals("Get a wrong content type", "text/plain", data.getContentType());
        assertEquals("Got the wrong name", "NOTICE.txt", data.getName());

        assertTrue("We should get the data from the DataHandle", data.getDataSource()
            .getInputStream().available() > 0);

        // The other form date can be get from the message header
        exchange.getOut().setBody(in.getHeader("comment"));
    }

});

Jetty JMX support

From Camel 2.3.0, camel-jetty supports the enabling of Jetty's JMX capabilities at the component and endpoint level with the endpoint configuration taking priority. Note that JMX must be enabled within the Camel context in order to enable JMX support in this component as the component provides Jetty with a reference to the MBeanServer registered with the Camel context. Because the camel-jetty component caches and reuses Jetty resources for a given protocol/host/port pairing, this configuration option will only be evaluated during the creation of the first endpoint to use a protocol/host/port pairing. For example, given two routes created from the following XML fragments, JMX support would remain enabled for all endpoints listening on "https://0.0.0.0".

<from uri="jetty:https://0.0.0.0/myapp/myservice1/?enableJmx=true"/>
<from uri="jetty:https://0.0.0.0/myapp/myservice2/?enableJmx=false"/>

The camel-jetty component also provides for direct configuration of the Jetty MBeanContainer. Jetty creates MBean names dynamically. If you are running another instance of Jetty outside of the Camel context and sharing the same MBeanServer between the instances, you can provide both instances with a reference to the same MBeanContainer in order to avoid name collisions when registering Jetty MBeans.

See Also

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