12.4. Configuring the Jetty Runtime

Overview

The Jetty runtime is used by HTTP service providers and HTTP consumers using a decoupled endpoint. The runtime's thread pool can be configured, and you can also set a number of the security settings for an HTTP service provider through the Jetty runtime.

Maven dependency

If you use Apache Maven as your build system, you can add the Jetty runtime to your project by including the following dependency in your project's pom.xml file: 
<dependency>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-rt-transports-http-jetty</artifactId>
    <version>${cxf-version}</version>
</dependency>

Namespace

The elements used to configure the Jetty runtime are defined in the namespace http://cxf.apache.org/transports/http-jetty/configuration. It is commonly referred to using the prefix httpj. In order to use the Jetty configuration elements you must add the lines shown in Example 12.14, “Jetty Runtime Configuration Namespace” to the beans element of your endpoint's configuration file. In addition, you must add the configuration elements' namespace to the xsi:schemaLocation attribute.

Example 12.14. Jetty Runtime Configuration Namespace

<beans ...
       xmlns:httpj="http://cxf.apache.org/transports/http-jetty/configuration"
       ...
       xsi:schemaLocation="...
                           http://cxf.apache.org/transports/http-jetty/configuration
                              http://cxf.apache.org/schemas/configuration/http-jetty.xsd
                          ...">

The engine-factory element

The httpj:engine-factory element is the root element used to configure the Jetty runtime used by an application. It has a single required attribute, bus, whose value is the name of the Bus that manages the Jetty instances being configured.
Note
The value is typically cxf which is the name of the default Bus instance.
The httpj:engine-factory element has three children that contain the information used to configure the HTTP ports instantiated by the Jetty runtime factory. The children are described in Table 12.7, “Elements for Configuring a Jetty Runtime Factory”.

Table 12.7. Elements for Configuring a Jetty Runtime Factory

ElementDescription
httpj:engine
Specifies the configuration for a particular Jetty runtime instance. See the section called “The engine element”.
httpj:identifiedTLSServerParameters
Specifies a reusable set of properties for securing an HTTP service provider. It has a single attribute, id, that specifies a unique identifier by which the property set can be referred.
httpj:identifiedThreadingParameters
Specifies a reusable set of properties for controlling a Jetty instance's thread pool. It has a single attribute, id, that specifies a unique identifier by which the property set can be referred.
See the section called “Configuring the thread pool”.

The engine element

The httpj:engine element is used to configure specific instances of the Jetty runtime. It has a single attribute, port, that specifies the number of the port being managed by the Jetty instance.
Note
You can specify a value of 0 for the port attribute. Any threading properties specified in an httpj:engine element with its port attribute set to 0 are used as the configuration for all Jetty listeners that are not explicitly configured.
Each httpj:engine element can have two children: one for configuring security properties and one for configuring the Jetty instance's thread pool. For each type of configuration you can either directly provide the configuration information or you can provide a reference to a set of configuration properties defined in the parent httpj:engine-factory element.
The child elements used to provide the configuration properties are described in Table 12.8, “Elements for Configuring a Jetty Runtime Instance”.

Table 12.8. Elements for Configuring a Jetty Runtime Instance

ElementDescription
httpj:tlsServerParameters
Specifies a set of properties for configuring the security used for the specific Jetty instance.
httpj:tlsServerParametersRef
Refers to a set of security properties defined by a identifiedTLSServerParameters element. The id attribute provides the id of the referred identifiedTLSServerParameters element.
httpj:threadingParameters
Specifies the size of the thread pool used by the specific Jetty instance. See the section called “Configuring the thread pool”.
httpj:threadingParametersRef
Refers to a set of properties defined by a identifiedThreadingParameters element. The id attribute provides the id of the referred identifiedThreadingParameters element.

Configuring the thread pool

You can configure the size of a Jetty instance's thread pool by either:
  • Specifying the size of the thread pool using a identifiedThreadingParameters element in the engine-factory element. You then refer to the element using a threadingParametersRef element.
  • Specifying the size of the of the thread pool directly using a threadingParameters element.
The threadingParameters has two attributes to specify the size of a thread pool. The attributes are described in Table 12.9, “Attributes for Configuring a Jetty Thread Pool”.
Note
The httpj:identifiedThreadingParameters element has a single child threadingParameters element.

Table 12.9. Attributes for Configuring a Jetty Thread Pool

AttributeDescription
minThreads
Specifies the minimum number of threads available to the Jetty instance for processing requests.
maxThreads
Specifies the maximum number of threads available to the Jetty instance for processing requests.

Example

Example 12.15, “Configuring a Jetty Instance” shows a configuration fragment that configures a Jetty instance on port number 9001.

Example 12.15. Configuring a Jetty Instance

<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:sec="http://cxf.apache.org/configuration/security"
  xmlns:http="http://cxf.apache.org/transports/http/configuration"
  xmlns:httpj="http://cxf.apache.org/transports/http-jetty/configuration"
  xmlns:jaxws="http://java.sun.com/xml/ns/jaxws"
  xsi:schemaLocation="http://cxf.apache.org/configuration/security
  		      http://cxf.apache.org/schemas/configuration/security.xsd
            http://cxf.apache.org/transports/http/configuration
            http://cxf.apache.org/schemas/configuration/http-conf.xsd
            http://cxf.apache.org/transports/http-jetty/configuration
            http://cxf.apache.org/schemas/configuration/http-jetty.xsd
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
  ...

  <httpj:engine-factory bus="cxf">
    <httpj:identifiedTLSServerParameters id="secure">
      <sec:keyManagers keyPassword="password">
        <sec:keyStore type="JKS" password="password" 
                      file="certs/cherry.jks"/>
      </sec:keyManagers>
    </httpj:identifiedTLSServerParameters>

    <httpj:engine port="9001">
      <httpj:tlsServerParametersRef id="secure" />
      <httpj:threadingParameters minThreads="5"
                                 maxThreads="15" />
    </httpj:engine>
  </httpj:engine-factory>
 </beans>