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Servlet Transport Reference

Mule runtime engine version 3.8 reached its End of Life on November 16, 2021. For more information, contact your Customer Success Manager to determine how to migrate to the latest Mule version.

The Servlet transport provides integration with a servlet implementation. The implementing servlet does the work of receiving a request, and the Servlet transport then hands off the request to any receivers registered with it. There is no notion of a dispatcher for this connector, as it is triggered by a request and may or may not return a response. You specify the servlet URL as part of the connector configuration and then specify the endpoints just like any other FTP endpoints.

Access a Servlet Endpoint

You can define a servlet in a web application that connects the request from the client to a Mule servlet endpoint.

For example in web.xml:

<servlet>
<servlet-name>muleServlet</servlet-name>
<servlet-class>org.mule.transport.servlet.MuleReceiverServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>muleServlet</servlet-name>
<url-pattern>/services/*</url-pattern>
</servlet-mapping>

Access the Servlet endpoint using an URL with the following pattern:
http://host:port/webapp-contextname/servlet-name/path

Where:

  • host and port - URL and port for where you access the Application Server

  • webapp-contextname - The context name of the web application where Mule is deployed

  • _servlet-name _- Mule servlet URL defined in web.xml

  • path - Path attribute in the endpoint

Javadoc

The Javadoc for this transport is:

Mule Servlet Transport Javadoc

Schema Description

For more information about using Mule with servlet containers, see Embedding Mule in a Java Application or Webapp.

Reference

Connector

Servlet connector is a channel adapter between Mule and a servlet engine. It allows the MuleReceiverServlet to look up components interested in requests it receives via the servlet container.

Table 1. Attributes of <connector…​>
Name Type Required Default Description

servletUrl

no

The real URL on which the servlet container is bound. If this is not set, the WSDL may not be generated correctly when using CXF bound to a servlet endpoint.

useCachedHttpServletRequest

boolean

no

false

Whether to use a cached HTTP servlet request.

No Child Elements of <connector…​>

For example:

<mule xmlns="http://www.mulesoft.org/schema/mule/core"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:spring="http://www.springframework.org/schema/beans"
       xmlns:servlet="http://www.mulesoft.org/schema/mule/servlet"
    xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
       http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
       http://www.mulesoft.org/schema/mule/servlet
       http://www.mulesoft.org/schema/mule/servlet/current/mule-servlet.xsd">

    <servlet:connector name="servletConnector" servletUrl="http://localhost:8888" />
...

You can also specify the servlet URL as part of the endpoint:

<servlet:inbound-endpoint path="http://localhost:8888" />

Servlet endpoints accept the same attributes and child elements as HTTP endpoints. For more information, see FTP Transport Reference.

Endpoint

Table 2. Attributes of <endpoint…​>
Name Type Required Default Description

path

string

yes

The servlet path to bind the service to.

No Child Elements of <endpoint…​>

Servlet Transport

The Servlet transport allows Mule components to listen for events received via a servlet request.

Connector

Servlet connector is a channel adapter between Mule and a servlet engine. It allows the MuleReceiverServlet to look up components interested in requests it receives via the servlet container.

Table 3. Attributes of <connector…​>
Name Type Required Default Description

servletUrl

no

The real URL on which the servlet container is bound. If this is not set, the WSDL may not be generated correctly when using CXF bound to a servlet endpoint.

useCachedHttpServletRequest

boolean

no

false

Whether to use a cached HTTP servlet request

No Child Elements of <connector…​>

Inbound endpoint

Table 4. Attributes of <inbound-endpoint…​>
Name Type Required Default Description

path

string

yes

Servlet path to bind the service to.

No Child Elements of <inbound-endpoint…​>

Endpoint

Table 5. Attributes of <endpoint…​>
Name Type Required Default Description

path

string

yes

Servlet path to bind the service to.

No Child Elements of <endpoint…​>

Transformers

These are transformers specific to this transport. Note that these are added automatically to the Mule registry at start up. When doing automatic transformations these will be included when searching for the correct transformers.

Name Description

http-request-to-parameter-map

The <http-request-to-parameter-map> transformer returns a simple Map of the parameters sent with the HTTP Request. If the same parameter is given more than once, only the first value for it will be in the Map.

http-request-to-input-stream

The <http-request-to-input-stream> transformer converts an HttpServletRequest into an InputStream.

http-request-to-byte-array

The <http-request-to-byte-array> transformer converts an HttpServletRequest into an array of bytes by extracting the payload of the request.