A WebSphere® Application Server service provider
can share its policy configuration in published Web Services Description
Language (WSDL), or WSDL that is obtained by using an HTTP GET request
or the Web Services Metadata Exchange (WS-MetadataExchange) GetMetadata
request.
Before you begin
You have developed a web services service
provider that contains all the necessary artifacts and deployed your
web services application into your application server instance. You
have attached the policy sets and managed the associated bindings.
For
a list of WS-Policy assertion specifications and WS-Policy domains
that are supported, see the topic about learning about WS-Policy.
About this task
You can make the policy configuration of a Java API for XML-Based Web Services (JAX-WS)
service endpoint available to share in the following ways:
- Include the policy configuration of the service provider in the
WSDL. The WSDL is then available to publish, or to obtain by using
an HTTP GET request.
- Enable the Web Services Metadata Exchange (WS-MetadataExchange)
protocol so that the policy configuration of the service provider
is included in the WSDL and is available to a WS-MetadataExchange
GetMetadata request. An advantage of using the WS-MetadataExchange
protocol is that you can apply message-level security to WS-MetadataExchange
GetMetadata requests by using a suitable system policy set.
If
the service provider application uses multipart WSDL, all the WSDL
must be local to the web service application. For more information
about multipart WSDL, see the topic about WSDL.
You must configure a service provider to share
its policy configuration because by default the policy configuration
is not available in its WSDL. You can configure the service provider
to include the policy configuration in its WSDL, to use WS-MetadataExchange
so that the policy configuration is available, or both. This
topic describes how to configure a service provider to share its policy
configuration by using the administrative console. You can also configure
a service provider to share its policy configuration by using wsadmin
commands or Rational® Application Developer tools.
You can configure a service provider to share
its policy configuration at application or service level. The policy
configuration that is represented by the policy sets attached to any
lower levels will also be shared. Policy sets that are attached at
lower levels override the policy set configuration attached at a higher
level.
Procedure
- From the navigation pane of the administrative console,
click .
- In the row for the application or service where the provider
policy that you want to share is attached, click the link in the Policy
sharing column. The link is either Enabled or Disabled.
The Policy Sharing pane is displayed.
- To include the policy configuration of the service provider
in its WSDL so that it can be either published or obtained by using
an HTTP GET request, select Exported WSDL.
- To enable WS-MetadataExchange and make the policy configuration
of the service provider available to a WS-MetadataExchange GetMetada
request, select WS-MetadataExchange request.
- Optional: If you select WS-MetadataExchange
request and you want to use message-level security, select Attach
a system policy set to the WS-MetadataExchange, then select
a suitable policy set and binding from the drop-down lists. See Configuring security for a WS-MetadataExchange request.
- Click OK and save your changes to
the master configuration.
Results
The policy configuration of the service
provider is available to its clients. The WSDL of the service provider
contains the current policy configuration in WS-PolicyAttachments
format so that it is available to other clients, service registries,
or services that support the Web Services Policy (WS-Policy) specification. The
link in the Policy Sharing column on the
Service provider
policy sets and bindings pane changes to
Enabled.
If the
policy configuration cannot be shared, an error that describes the
problem is written to the service provider error log, and the following
policy is attached to the WSDL of the service provider:
<wsp:Policy>
<wsp:ExactlyOne>
</wsp:ExactlyOne>
</wsp:Policy>
This policy notifies the client that
there is no acceptable policy configuration for the service. Other
aspects of the WSDL are unaffected.
A service provider might not be able to share
its policy configuration because the configuration cannot be expressed
in the standard WS-PolicyAttachments format. One reason might be because
multiple incompatible policies are defined for a particular attach
point. Another reason might be because there is not enough binding
information to generate the standard policy. Policy configuration
might include bootstrap policy, for example, the policy to access
a WS-Trust service, so the bootstrap policy must also be expressed
in WS-PolicyAttachments format.