[[Apache_CXF_integration]]
= Apache CXF integration

[[jbossws-integration-layer-with-apache-cxf]]
== JBossWS integration layer with Apache CXF

All Jakarta XML Web Services functionalities provided by JBossWS on top of WildFly are
currently served through a proper integration of the JBoss Web Services
stack with most of the http://cxf.apache.org/[Apache CXF] project
modules.

Apache CXF is an open source services framework. It allows building and
developing services using frontend programming APIs (including Jakarta XML Web Services),
with services speaking a variety of protocols such as SOAP and XML/HTTP
over a variety of transports such as HTTP and Jakarta Messaging.

The integration layer ( _JBossWS-CXF_ in short hereafter) is mainly
meant for:

* allowing using standard webservices APIs (including Jakarta XML Web Services) on
WildFly; this is performed internally leveraging Apache CXF without
requiring the user to deal with it;
* allowing using Apache CXF advanced features (including WS-*) on top of
WildFly without requiring the user to deal with / setup / care about the
required integration steps for running in such a container.

In order for achieving the goals above, the JBossWS-CXF integration
supports the JBoss ws endpoint deployment mechanism and comes with many
internal customizations on top of Apache CXF.

In the next sections a list of technical suggestions and notes on the
integration is provided; please also refer to the
http://cxf.apache.org/docs/index.html[Apache CXF official documentation]
for in-depth details on the CXF architecture.

[[building-ws-applications-the-jboss-way]]
== Building WS applications the JBoss way

The Apache CXF client and endpoint configuration as explained in the
http://cxf.apache.org/docs/index.html[Apache CXF official user guide] is
heavily based on Spring. Apache CXF basically parses Spring `cxf.xml`
descriptors; those may contain any basic bean plus specific ws client
and endpoint beans which CXF has custom parsers for. Apache CXF can be
used to deploy webservice endpoints on any servlet container by
including its libraries in the deployment; in such a scenario Spring
basically serves as a convenient configuration option, given direct
Apache CXF API usage won't be very handy. Similar reasoning applies on
client side, where a Spring based descriptor offers a shortcut for
setting up Apache CXF internals.

This said, nowadays almost any Apache CXF functionality can be
configured and used through direct API usage, without Spring. As a
consequence of that and given the considerations in the sections below,
the JBossWS integration with Apache CXF does not rely on Spring
descriptors.

[[portable-applications]]
=== Portable applications

WildFly is much more then a servlet container; it actually provides
users with a fully compliant target platform for Jakarta EE applications.

Generally speaking, _users are encouraged to write portable
applications_ by relying only on _Jakarta XML Web Services specification_ whenever
possible. That would by the way ensure easy migrations to and from other
compliant platforms. Being a Jakarta EE container, WildFly already comes
with a Jakarta XML Web Services compliant implementation, which is basically Apache CXF
plus the JBossWS-CXF integration layer. So users just need to write
their Jakarta XML Web Services application; _no need for embedding any Apache CXF or any
ws related dependency library in user deployments_. Please refer to the
<<Jakarta_XML_Web_Services_User_Guide,Jakarta XML Web Services User Guide>> section of the documentation for
getting started.

WS-* usage (including WS-Security, WS-Addressing, WS-ReliableMessaging,
...) should also be configured in the most portable way; that is by
_relying on proper WS-Policy assertions_ on the endpoint WSDL contracts,
so that client and endpoint configuration is basically a matter of
setting few ws context properties. The WS-* related sections of this
documentation cover all the details on configuring applications making
use of WS-* through policies.

As a consequence of the reasoning above, the JBossWS-CXF integration is
currently built directly on the Apache CXF API and aims at allowing
users to configure webservice clients and endpoints _without Spring
descriptors_.

[[direct-apache-cxf-api-usage]]
=== Direct Apache CXF API usage

Whenever users can't really meet their application requirements with
Jakarta XML Web Services plus WS-Policy, it is of course still possible to rely on direct
Apache CXF API usage (given that's included in the AS), loosing the Java
EE portability of the application. That could be the case of a user
needing specific Apache CXF functionalities, or having to consume WS-*
enabled endpoints advertised through legacy wsdl contracts without
WS-Policy assertions.

On server side, direct Apache CXF API usage might not be always possible
or end up being not very easy. For this reason, the JBossWS integration
comes with a convenient alternative through customization options in the
`jboss-webservices.xml` descriptor described below on this page.
Properties can be declared in `jboss-webservices.xml` to control Apache
CXF internals like _interceptors_, _features_, etc.

[[bus-usage]]
== Bus usage

[[creating-a-bus-instance]]
=== Creating a Bus instance

Most of the Apache CXF features are configurable using the
`org.apache.cxf.Bus` class. While for basic Jakarta XML Web Services usage the user might
never need to explicitly deal with Bus, using Apache CXF specific
features generally requires getting a handle to a `org.apache.cxf.Bus`
instance. This can happen on client side as well as in a ws endpoint or
handler business code.

New Bus instances are produced by the currently configured
`org.apache.cxf.BusFactory` implementation the following way:

[source,java,options="nowrap"]
----
Bus bus = BusFactory.newInstance().createBus();
----

The algorithm for selecting the actual implementation of `BusFactory` to
be used leverages the Service API, basically looking for optional
configurations in _META-INF/services/..._ location using the current
thread context classloader. JBossWS-CXF integration comes with its own
implementation of `BusFactory`,
`org.jboss.wsf.stack.cxf.client.configuration.JBossWSBusFactory`, that
allows for seamless setup of JBossWS customizations on top of Apache
CXF. So, assuming the JBossWS-CXF libraries are available in the current
thread context classloader, the `JBossWSBusFactory` is _automatically_
retrieved by the `BusFactory.newInstance()` call above.

JBossWS users willing to explicitly use functionalities of
`org.apache.cxf.bus.CXFBusFactory` _,_ get the same API with JBossWS
additions through `JBossWSBusFactory`:

[source,java,options="nowrap"]
----
Map<Class, Object> myExtensions = new HashMap<Class, Object>();
myExtensions.put(...);
Bus bus = new JBossWSBusFactory().createBus(myExtensions);
----

[[using-existing-bus-instances]]
=== Using existing Bus instances

Apache CXF keeps reference to a global default `Bus` instance as well as
to a thread default bus for each thread. That is performed through
static members in `org.apache.cxf.BusFactory` _,_ which also comes with
the following methods in the public API:

[source,java,options="nowrap"]
----
public static synchronized Bus getDefaultBus()
public static synchronized Bus getDefaultBus(boolean createIfNeeded)
public static synchronized void setDefaultBus(Bus bus)
public static Bus getThreadDefaultBus()
public static Bus getThreadDefaultBus(boolean createIfNeeded)
public static void setThreadDefaultBus(Bus bus)
----

Please note that the default behaviour of `getDefaultBus()` _/_
`getDefaultBus(true)` _/_ `getThreadDefaultBus()` _/_
`getThreadDefaultBus(true)` is to create a new Bus instance if that's
not set yet. Moreover _getThreadDefaultBus()_ and
_getThreadDefaultBus(true)_ first fallback to retrieving the configured
global default bus before actually trying creating a new instance (and
the created new instance is set as global default bus if that was not
set there yet).

The drawback of this mechanism (which is basically fine in JSE
environment) is that when running in WildFly container you need to be
careful in order not to (mis)use a bus over multiple applications
(assuming the Apache CXF classes are loaded by the same classloader,
which is currently the case with WildFly).

Here is a list of general suggestions to avoid problems when running
in-container:

* forget about the global default bus; you don't need that, so don't do
`getDefaultBus()` _/_ `getDefaultBus(true)` _/_ `setDefaultBus()` in
your code;
* avoid `getThreadDefaultBus()` _/_ `getThreadDefaultBus(true)` unless
you already know for sure the default bus is already set;
* keep in mind thread pooling whenever you customize a thread default
bus instance (for instance adding bus scope interceptors, ...), as that
thread and bus might be later reused; so either shutdown the bus when
you're done or explicitly remove it from the BusFactory thread
association.

Finally, remember that each time you explictly create a new Bus instance
(factory.createBus()) that is set as thread default bus and global
default bus if those are not set yet. The JAXWS `Provider`
implementation also creates `Bus` instances internally, in particular
the JBossWS version of JAXWS `Provider` makes sure the default bus is
never internally used and instead a new `Bus` is created if required
(more details on this in the next paragraph).

[[bus-selection-strategies-for-jaxws-clients]]
=== Bus selection strategies for JAXWS clients

JAXWS clients require an Apache CXF Bus to be available; the client is
registered within the Bus and the Bus affects the client behavior (e.g.
through the configured CXF interceptors). The way a bus is internally
selected for serving a given JAXWS client is very important, especially
for in-container clients; for this reason, JBossWS users can choose the
preferred Bus selection strategy. The strategy is enforced in the
`jakarta.xml.ws.spi.Provider` implementation from the JBossWS integration,
being that called whenever a JAXWS `Service` (client) is requested.

[[thread-bus-strategy-thread_bus]]
==== Thread bus strategy (THREAD_BUS)

Each time the vanilla JAXWS api is used to create a Bus, the JBossWS-CXF
integration will automatically make sure a Bus is currently associated
to the current thread in the BusFactory. If that's not the case, a new
Bus is created and linked to the current thread (to prevent the user
from relying on the default Bus). The Apache CXF engine will then create
the client using the current thread Bus.

This is the default strategy, and the most straightforward one in Java
SE environments; it lets users automatically reuse a previously created
Bus instance and allows using customized Bus that can possibly be
created and associated to the thread before building up a JAXWS client.

The drawback of the strategy is that the link between the Bus instance
and the thread needs to be eventually cleaned up (when not needed
anymore). This is really evident in a Jakarta EE environment (hence when
running in-container), as threads from pools (e.g. serving web requests)
are re-used.

When relying on this strategy, the safest approach to be sure of
cleaning up the link is to surround the JAXWS client with a
`try/finally` block as below:

[source,java,options="nowrap"]
----
try {
  Service service = Service.create(wsdlURL, serviceQName);
  MyEndpoint port = service.getPort(MyEndpoint.class);
  //...
} finally {
  BusFactory.setThreadDefaultBus(null);
  // OR (if you don't need the bus and the client anymore)
   Bus bus = BusFactory.getThreadDefaultBus(false);
  bus.shutdown(true);
}
----

[[new-bus-strategy-new_bus]]
==== New bus strategy (NEW_BUS)

Another strategy is to have the JAXWS Provider from the JBossWS
integration create a new Bus each time a JAXWS client is built. The main
benefit of this approach is that a fresh bus won't rely on any formerly
cached information (e.g. cached WSDL / schemas) which might have changed
after the previous client creation. The main drawback is of course worse
performance as the Bus creation takes time.

If there's a bus already associated to the current thread before the
JAXWS client creation, that is automatically restored when returning
control to the user; in other words, the newly created bus will be used
only for the created JAXWS client but won't stay associated to the
current thread at the end of the process. Similarly, if the thread was
not associated to any bus before the client creation, no bus will be
associated to the thread at the end of the client creation.

[[thread-context-classloader-bus-strategy-tccl_bus]]
==== Thread context classloader bus strategy (TCCL_BUS)

The last strategy is to have the bus created for serving the client be
associated to the current thread context classloader (TCCL). That
basically means the same Bus instance is shared by JAXWS clients running
when the same TCCL is set. This is particularly interesting as each web
application deployment usually has its own context classloader, so this
strategy is possibly a way to keep the number of created Bus instances
bound to the application number in WildFly container.

If there's a bus already associated to the current thread before the
JAXWS client creation, that is automatically restored when returning
control to the user; in other words, the bus corresponding to the
current thread context classloader will be used only for the created
JAXWS client but won't stay associated to the current thread at the end
of the process. If the thread was not associated to any bus before the
client creation, a new bus will be created (and later user for any other
client built with this strategy and the same TCCL in place); no bus will
be associated to the thread at the end of the client creation.

[[strategy-configuration]]
==== Strategy configuration

Users can request a given Bus selection strategy to be used for the
client being built by specifying one of the following JBossWS features
(which extend `jakarta` `.` `xml` `.` `ws` `.` `WebServiceFeature`):

[cols=",",options="header"]
|==============================================================
|Feature |Strategy
|org.jboss.wsf.stack.cxf.client.UseThreadBusFeature |THREAD_BUS
|org.jboss.wsf.stack.cxf.client.UseNewBusFeature |NEW_BUS
|org.jboss.wsf.stack.cxf.client.UseTCCLBusFeature |TCCL_BUS
|==============================================================

The feature is specified as follows:

[source,java,options="nowrap"]
----
Service service = Service.create(wsdlURL, serviceQName, new UseThreadBusFeature());
----

If no feature is explicitly specified, the system default strategy is
used, which can be modified through the
`org.jboss.ws.cxf.jaxws-client.bus.strategy` system property when
starting the JVM. The valid values for the property are `THREAD_BUS`,
`NEW_BUS` and `TCCL_BUS`. The default is `THREAD_BUS`.

[[server-side-integration-customization]]
== Server Side Integration Customization

The JBossWS-CXF server side integration takes care of internally
creating proper Apache CXF structures (including a `Bus` instance, of
course) for the provided ws deployment. Should the deployment include
multiple endpoints, those would all live within the same Apache CXF Bus,
which would of course be completely separated by the other deployments'
bus instances.

While JBossWS sets sensible defaults for most of the Apache CXF
configuration options on server side, users might want to fine tune the
`Bus` instance that's created for their deployment; a
`jboss-webservices.xml` descriptor can be used for deployment level
customizations.

[[deployment-descriptor-properties]]
=== Deployment descriptor properties

The `jboss-webservices.xml` descriptor can be used to
<<Jakarta_XML_Web_Services_Advanced_User_Guide,provide property values>>.

[source,xml,options="nowrap"]
----
<webservices xmlns="http://www.jboss.com/xml/ns/javaee" version="1.2">
  ...
  <property>
    <name>...</name>
    <value>...</value>
  </property>
  ...
</webservices>
----

JBossWS-CXF integration comes with a set of allowed property names to
control Apache CXF internals.

[[workqueue-configuration]]
==== WorkQueue configuration

Apache CXF uses WorkQueue instances for dealing with some operations
(e.g. @Oneway requests processing). A
http://cxf.apache.org/javadoc/latest-2.5.x/org/apache/cxf/workqueue/WorkQueueManager.html[WorkQueueManager]
is installed in the Bus as an extension and allows for adding / removing
queues as well as controlling the existing ones.

On server side, queues can be provided by using the
`cxf.queue.<queue-name>.*` properties in `jboss-webservices.xml` (e.g.
`cxf.queue.default.maxQueueSize` for controlling the max queue size of
the `default` workqueue). At deployment time, the JBossWS integration
can add new instances of
http://cxf.apache.org/javadoc/latest-2.5.x/org/apache/cxf/workqueue/AutomaticWorkQueueImpl.html[AutomaticWorkQueueImpl]
to the currently configured WorkQueueManager; the properties below are
used to fill in parameter into the
http://cxf.apache.org/javadoc/latest-2.5.x/org/apache/cxf/workqueue/AutomaticWorkQueueImpl.html#AutomaticWorkQueueImpl(int,%20int,%20int,%20int,%20long,%20java.lang.String)[AutomaticWorkQueueImpl
constructor]:

[cols=",",options="header"]
|=============================================
|Property |Default value
|cxf.queue.<queue-name>.maxQueueSize |256
|cxf.queue.<queue-name>.initialThreads |0
|cxf.queue.<queue-name>.highWaterMark |25
|cxf.queue.<queue-name>.lowWaterMark |5
|cxf.queue.<queue-name>.dequeueTimeout |120000
|=============================================

[[policy-alternative-selector]]
==== Policy alternative selector

The Apache CXF policy engine supports different strategies to deal with
policy alternatives. JBossWS-CXF integration currently defaults to the
http://cxf.apache.org/javadoc/latest-2.5.x/org/apache/cxf/ws/policy/selector/MaximalAlternativeSelector.html[MaximalAlternativeSelector],
but still allows for setting different selector implementation using the
`cxf.policy.alternativeSelector` property in `jboss-webservices.xml`.

[[mbean-management]]
==== MBean management

Apache CXF allows managing its MBean objects that are installed into the
WildFly MBean server. The feature is enabled on a deployment basis
through the `cxf.management.enabled` property in
`jboss-webservices.xml`. The
`cxf.management.installResponseTimeInterceptors` property can also be
used to control installation of CXF response time interceptors, which
are added by default when enabling MBean management, but might not be
desired in some cases. Here is an example:

[source,xml,options="nowrap"]
----
<webservices xmlns="http://www.jboss.com/xml/ns/javaee" version="1.2">
  <property>
    <name>cxf.management.enabled</name>
    <value>true</value>
  </property>
  <property>
    <name>cxf.management.installResponseTimeInterceptors</name>
    <value>false</value>
  </property>
</webservices>
----

[[schema-validation]]
==== Schema validation

Schema validation of exchanged messages can also be enabled in
`jboss-webservices.xml`. Further details available
<<Jakarta_XML_Web_Services_User_Guide,here>>.

[[Interceptors]]
==== Interceptors

The `jboss-webservices.xml` descriptor also allows specifying the
`cxf.interceptors.in` and `cxf.interceptors.out` properties; those
allows declaring interceptors to be attached to the Bus instance that's
created for serving the deployment.

[source,xml,options="nowrap"]
----
<?xml version="1.1" encoding="UTF-8"?>
<webservices
xmlns="http://www.jboss.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
version="1.2"
xsi:schemaLocation="http://www.jboss.com/xml/ns/javaee">
 
<property>
<name>cxf.interceptors.in</name>
<value>org.jboss.test.ws.jaxws.cxf.interceptors.BusInterceptor</value>
</property>
<property>
<name>cxf.interceptors.out</name>
<value>org.jboss.test.ws.jaxws.cxf.interceptors.BusCounterInterceptor</value>
</property>
</webservices>
----

[[features]]
==== Features

The `jboss-webservices.xml` descriptor also allows specifying the
`cxf.features` property; that allows declaring features to be attached
to any endpoint belonging to the Bus instance that's created for serving
the deployment.

[source,xml,options="nowrap"]
----
<?xml version="1.1" encoding="UTF-8"?>
<webservices
xmlns="http://www.jboss.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
version="1.2"
xsi:schemaLocation="http://www.jboss.com/xml/ns/javaee">
 
<property>
<name>cxf.features</name>
<value>org.apache.cxf.feature.FastInfosetFeature</value>
</property>
</webservices>
----

[[ws-discovery-enablement]]
==== WS-Discovery enablement

WS-Discovery support can be turned on in `jboss-webservices` for the
current deployment. Further details available <<Jakarta_XML_Web_Services_User_Guide,here>>.

[[apache-cxf-interceptors]]
== Apache CXF interceptors

Apache CXF supports declaring interceptors using one of the following
approaches:

* Annotation usage on endpoint classes (
`@org.apache.cxf.interceptor.InInterceptor`,
`@org.apache.cxf.interceptor.OutInterceptor`)
* Direct API usage on client side (through the
`org.apache.cxf.interceptor.InterceptorProvider` interface)
* Spring descriptor usage ( _cxf.xml_)

As the Spring descriptor usage is not supported, the JBossWS integration
adds an additional descriptor based approach to avoid requiring
modifications to the actual client/endpoint code. Users can declare
interceptors within <<Predefined_client_and_endpoint_configurations,predefined client and endpoint
configurations>> by specifying a list of interceptor class names for the
`cxf.interceptors.in` and `cxf.interceptors.out` properties.

[source,xml,options="nowrap"]
----
<?xml version="1.0" encoding="UTF-8"?>
<jaxws-config xmlns="urn:jboss:jbossws-jaxws-config:4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:javaee="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="urn:jboss:jbossws-jaxws-config:4.0 schema/jbossws-jaxws-config_4_0.xsd">
<endpoint-config>
<config-name>org.jboss.test.ws.jaxws.cxf.interceptors.EndpointImpl</config-name>
<property>
<property-name>cxf.interceptors.in</property-name>
<property-value>org.jboss.test.ws.jaxws.cxf.interceptors.EndpointInterceptor,org.jboss.test.ws.jaxws.cxf.interceptors.FooInterceptor</property-value>
</property>
<property>
<property-name>cxf.interceptors.out</property-name>
<property-value>org.jboss.test.ws.jaxws.cxf.interceptors.EndpointCounterInterceptor</property-value>
</property>
</endpoint-config>
</jaxws-config>
----

A new instance of each specified interceptor class will be added to the
client or endpoint the configuration is assigned to. The interceptor
classes must have a no-argument constructor.

[[apache-cxf-features]]
== Apache CXF features

Apache CXF supports declaring features using one of the following
approaches:

* Annotation usage on endpoint classes (
`@org.apache.cxf.feature.Features`)
* Direct API usage on client side (through extensions of the
`org.apache.cxf.feature.AbstractFeature` class)
* Spring descriptor usage ( _cxf.xml_)

As the Spring descriptor usage is not supported, the JBossWS integration
adds an additional descriptor based approach to avoid requiring
modifications to the actual client/endpoint code. Users can declare
features within <<Predefined_client_and_endpoint_configurations,predefined client and endpoint
configurations>> by specifying a list of feature class names for the
`cxf.features` property.

[source,xml,options="nowrap"]
----
<?xml version="1.0" encoding="UTF-8"?>
<jaxws-config xmlns="urn:jboss:jbossws-jaxws-config:4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:javaee="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="urn:jboss:jbossws-jaxws-config:4.0 schema/jbossws-jaxws-config_4_0.xsd">
<endpoint-config>
<config-name>Custom FI Config</config-name>
<property>
<property-name>cxf.features</property-name>
<property-value>org.apache.cxf.feature.FastInfosetFeature</property-value>
</property>
</endpoint-config>
</jaxws-config>
----

A new instance of each specified feature class will be added to the
client or endpoint the configuration is assigned to. The feature classes
must have a no-argument constructor.

[[properties-driven-bean-creation]]
== Properties driven bean creation

Sections above explain how to declare CXF interceptors and features
through properties either in a client/endpoint predefined configuration
or in a `jboss-webservices.xml` descriptor. By getting the
feature/interceptor class name only specified, the container simply
tries to create a bean instance using the class default constructor.
This sets a limitation on the feature/interceptor configuration, unless
custom extensions of vanilla CXF classes are provided, with the default
constructor setting properties before eventually using the super
constructor.

To cope with this issue, JBossWS integration comes with a mechanism for
configuring simple bean hierarchies when building them up from
properties. Properties can have bean reference values, that is strings
starting with `##`. Property reference keys are used to specify the bean
class name and the value for for each attribute. So for instance the
following properties:

[cols=",",options="header"]
|==========================
|Key |Value
|cxf.features |##foo, ##bar
|##foo |org.jboss.Foo
|##foo.par |34
|##bar |org.jboss.Bar
|##bar.color |blue
|==========================

would result into the stack installing two feature instances, the same
that would have been created by

[source,java,options="nowrap"]
----
import org.Bar;
import org.Foo;
 
...
 
Foo foo = new Foo();
foo.setPar(34);
Bar bar = new Bar();
bar.setColor("blue");
----

The mechanism assumes that the classes are valid beans with proper
getter and setter methods; value objects are cast to the correct
primitive type by inspecting the class definition. Nested beans can of
course be configured.

[[httpconduit-configuration]]
== HTTPConduit configuration

HTTP transport setup in Apache CXF is achieved through
`org.apache.cxf.transport.http.HTTPConduit`
http://cxf.apache.org/docs/client-http-transport-including-ssl-support.html[configurations].
When running on top of the JBossWS integration, conduits can be
programmatically modified using the Apache CXF API as follows:

[source,java,options="nowrap"]
----
import org.apache.cxf.frontend.ClientProxy;
import org.apache.cxf.transport.http.HTTPConduit;
import org.apache.cxf.transports.http.configuration.HTTPClientPolicy;
 
//set chunking threshold before using a Jakarta XML Web Services port client
...
HTTPConduit conduit = (HTTPConduit)ClientProxy.getClient(port).getConduit();
HTTPClientPolicy client = conduit.getClient();
 
client.setChunkingThreshold(8192);
...
----

Users can also control the default values for the most common
HTTPConduit parameters by setting specific system properties; the
provided values will override Apache CXF defaut values.

[cols=",",options="header"]
|=======================================================================
|Property |Description

|cxf.client.allowChunking |A boolean to tell Apache CXF whether to allow
send messages using chunking.

|cxf.client.chunkingThreshold |An integer value to tell Apache CXF the
threshold at which switching from non-chunking to chunking mode.

|cxf.client.connectionTimeout |A long value to tell Apache CXF how many
milliseconds to set the connection timeout to

|cxf.client.receiveTimeout |A long value to tell Apache CXF how many
milliseconds to set the receive timeout to

|cxf.client.connection |A string to tell Apache CXF to use Keep-Alive or
close connection type

|cxf.tls-client.disableCNCheck |A boolean to tell Apache CXF whether
disabling CN host name check or not
|=======================================================================

The vanilla Apache CXF defaults apply when the system properties above
are not set.
