XMPP

Since Camel 1.0

Both producer and consumer are supported

The XMPP component implements an XMPP (Jabber) transport.

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-xmpp</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

URI format

xmpp://[login@]hostname[:port][/participant][?Options]

The component supports both room based and private person-person conversations.
The component supports both producer and consumer (you can get messages from XMPP or send messages to XMPP). Consumer mode supports rooms starting.

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

At the component level, you set general and shared configurations that are, then, inherited by the endpoints. It is the highest configuration level.

For example, a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre-configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

You can configure components using:

  • the Component DSL.

  • in a configuration file (application.properties, *.yaml files, etc).

  • directly in the Java code.

Configuring Endpoint Options

You usually spend more time setting up endpoints because they have many options. These options help you customize what you want the endpoint to do. The options are also categorized into whether the endpoint is used as a consumer (from), as a producer (to), or both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java.

A good practice when configuring options is to use Property Placeholders.

Property placeholders provide a few benefits:

  • They help prevent using hardcoded urls, port numbers, sensitive information, and other settings.

  • They allow externalizing the configuration from the code.

  • They help the code to become more flexible and reusable.

The following two sections list all the options, firstly for the component followed by the endpoint.

Component Options

The XMPP component supports 3 options, which are listed below.

Name Description Default Type

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

Endpoint Options

The XMPP endpoint is configured using URI syntax:

xmpp:host:port/participant

With the following path and query parameters:

Path Parameters (3 parameters)

Name Description Default Type

host (common)

Required Hostname for the chat server.

String

port (common)

Required Port number for the chat server.

int

participant (common)

JID (Jabber ID) of person to receive messages. room parameter has precedence over participant.

String

Query Parameters (19 parameters)

Name Description Default Type

login (common)

Whether to login the user.

true

boolean

nickname (common)

Use nickname when joining room. If room is specified and nickname is not, user will be used for the nickname.

String

pubsub (common)

Accept pubsub packets on input, default is false.

false

boolean

room (common)

If this option is specified, the component will connect to MUC (Multi User Chat). Usually, the domain name for MUC is different from the login domain. For example, if you are supermanjabber.org and want to join the krypton room, then the room URL is kryptonconference.jabber.org. Note the conference part. It is not a requirement to provide the full room JID. If the room parameter does not contain the symbol, the domain part will be discovered and added by Camel.

String

serviceName (common)

The name of the service you are connecting to. For Google Talk, this would be gmail.com.

String

testConnectionOnStartup (common)

Specifies whether to test the connection on startup. This is used to ensure that the XMPP client has a valid connection to the XMPP server when the route starts. Camel throws an exception on startup if a connection cannot be established. When this option is set to false, Camel will attempt to establish a lazy connection when needed by a producer, and will poll for a consumer connection until the connection is established. Default is true.

true

boolean

createAccount (common (advanced))

If true, an attempt to create an account will be made. Default is false.

false

boolean

resource (common (advanced))

XMPP resource. The default is Camel.

Camel

String

connectionPollDelay (consumer)

The amount of time in seconds between polls (in seconds) to verify the health of the XMPP connection, or between attempts to establish an initial consumer connection. Camel will try to re-establish a connection if it has become inactive. Default is 10 seconds.

10

int

doc (consumer)

Set a doc header on the IN message containing a Document form of the incoming packet; default is true if presence or pubsub are true, otherwise false.

false

boolean

bridgeErrorHandler (consumer (advanced))

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

exceptionHandler (consumer (advanced))

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

ExceptionHandler

exchangePattern (consumer (advanced))

Sets the exchange pattern when the consumer creates an exchange.

Enum values:

  • InOnly

  • InOut

ExchangePattern

lazyStartProducer (producer (advanced))

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

connectionConfig (advanced)

To use an existing connection configuration. Currently org.jivesoftware.smack.tcp.XMPPTCPConnectionConfiguration is only supported (XMPP over TCP).

ConnectionConfiguration

headerFilterStrategy (filter)

To use a custom HeaderFilterStrategy to filter header to and from Camel message.

HeaderFilterStrategy

password (security)

Password for login.

String

roomPassword (security)

Password for room.

String

user (security)

User name (without server name). If not specified, anonymous login will be attempted.

String

Message Headers

The XMPP component supports 1 message header(s), which is/are listed below:

Name Description Default Type

CamelXmppDoc (consumer)

Constant: DOC_HEADER

The XMPP message.

Message

Headers and setting Subject or Language

Camel sets the message IN headers as properties on the XMPP message. You can configure a HeaderFilterStategy if you need custom filtering of headers. The Subject and Language of the XMPP message are also set if they are provided as IN headers.

Examples

User superman to join room krypton at jabber server with password, secret:

xmpp://superman@jabber.org/?room=krypton@conference.jabber.org&password=secret

User superman to send messages to joker:

xmpp://superman@jabber.org/joker@jabber.org?password=secret

Routing example in Java:

from("timer://kickoff?period=10000").
setBody(constant("I will win!\n Your Superman.")).
to("xmpp://superman@jabber.org/joker@jabber.org?password=secret");

Consumer configuration, which writes all messages from joker into the queue, evil.talk.

from("xmpp://superman@jabber.org/joker@jabber.org?password=secret").
to("activemq:evil.talk");

Consumer configuration, which listens to room messages:

from("xmpp://superman@jabber.org/?password=secret&room=krypton@conference.jabber.org").
to("activemq:krypton.talk");

Room in short notation (no domain part):

from("xmpp://superman@jabber.org/?password=secret&room=krypton").
to("activemq:krypton.talk");

When connecting to the Google Chat service, you’ll need to specify the serviceName as well as your credentials:

from("direct:start").
  to("xmpp://talk.google.com:5222/touser@gmail.com?serviceName=gmail.com&user=fromuser&password=secret").
  to("mock:result");

Spring Boot Auto-Configuration

When using xmpp with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-xmpp-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 4 options, which are listed below.

Name Description Default Type

camel.component.xmpp.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.xmpp.bridge-error-handler

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

Boolean

camel.component.xmpp.enabled

Whether to enable auto configuration of the xmpp component. This is enabled by default.

Boolean

camel.component.xmpp.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean
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