Many of these properties map to properties on Spring JMS, which Camel uses for sending and receiving messages. So you can get more information about these properties by consulting the relevant Spring documentation.

The options are divided into two tables, the first one with the most common options used. The latter contains the rest.

Most commonly used options

Option	Default Value	Description
`clientId`	`null`	Sets the JMS client ID to use. Note that this value, if specified, must be unique and can only be used by a single JMS connection instance. It is typically only required for durable topic subscriptions. You may prefer to use Virtual Topics instead.
`concurrentConsumers`	`1`	Specifies the default number of concurrent consumers. From Camel 2.10.3 onwards this option can also be used when doing request/reply over JMS. See also the `maxMessagesPerTask` option to control dynamic scaling up/down of threads.
`disableReplyTo`	`false`	If `true`, a producer will behave like a InOnly exchange with the exception that `JMSReplyTo` header is sent out and not be suppressed like in the case of `InOnly`. Like `InOnly` the producer will not wait for a reply. A consumer with this flag will behave like `InOnly`. This feature can be used to bridge `InOut` requests to another queue so that a route on the other queue will send it´s response directly back to the original `JMSReplyTo`.
`durableSubscriptionName`	`null`	The durable subscriber name for specifying durable topic subscriptions. The `clientId` option must be configured as well.
`maxConcurrentConsumers`	`1`	Specifies the maxim um number of concurrent consumers. From Camel 2.10.3 onwards this option can also be used when doing request/reply over JMS. See also the `maxMessagesPerTask` option to control dynamic scaling up/down of threads.
`maxMessagesPerTask`	`-1`	The number of messages per task. -1 is unlimited. If you use a range for concurrent consumers (eg min < max), then this option can be used to set a value to eg `100` to control how fast the consumers will shrink when less work is required.
`preserveMessageQos`	`false`	Set to `true`, if you want to send message using the QoS settings specified on the message, instead of the QoS settings on the JMS endpoint. The following three headers are considered `JMSPriority`, `JMSDeliveryMode`, and `JMSExpiration`. You can provide all or only some of them. If not provided, Camel will fall back to use the values from the endpoint instead. So, when using this option, the headers override the values from the endpoint. The `explicitQosEnabled` option, by contrast, will only use options set on the endpoint, and not values from the message header.
`replyTo`	`null`	Provides an explicit ReplyTo destination, which overrides any incoming value of `Message.getJMSReplyTo()`. If you do Request Reply over JMS then make sure to read the section Request-reply over JMS further below for more details, and the `replyToType` option as well.
`replyToOverride`	`null`	Camel 2.15: Provides an explicit ReplyTo destination in the JMS message, which overrides the setting of replyTo. It is useful if you want to forward the message to a remote Queue and receive the reply message from the ReplyTo destination.
`replyToType`	`null`	Camel 2.9: Allows for explicitly specifying which kind of str ategy to use for replyTo queues when doing request/reply over JMS. Possible values are: `Temporary`, `Shared`, or `Exclusive`. By default Camel will use temporary queues. However if `replyTo` has been configured, then `Shared` is used by default. This option allows you to use exclusive queues instead of shared ones. See further below for more details, and especially the notes about the implications if running in a clustered environment, and the fact that `Shared` reply queues has lower performance than its alternatives `Temporary` and `Exclusive`.
`requestTimeout`	`20000`	Producer only: The timeout for waiting for a reply when using the InOut Exchange Pattern (in milliseconds). The default is 20 seconds. From Camel 2.13/2.12.3 onwards you can include the header `"CamelJmsRequestTimeout"` to override this endpoint configured timeout value, and thus have per message individual timeout values. See below in section About time to live for more details. See also the requestTimeoutCheckerInterval option.
`selector`	`null`	Sets the JMS Selector, which is an SQL 92 predicate that is used to filter messages within the broker. You may have to encode special characters such as = as %3D Before Camel 2.3.0, we don't support this option in CamelConsumerTemplate
`timeToLive`	`null`	When sending messages, specifies the time-to-live of the message (in milliseconds). See below in section About time to live for more details.
`transacted`	`false`	Specifies whether to use transacted mode for sending/receiving messages using the InOnly Exchange Pattern.
`testConnectionOnStartup`	`false`	Camel 2.1: Specifies whether to test the connection o n startup. This ensures that when Camel starts that all the JMS consumers have a valid connection to the JMS broker. If a connection cannot be granted then Camel throws an exception on startup. This ensures that Camel is not started with failed connections. From Camel 2.8 onwards also the JMS producers is tested as well.

All the other options

Option	Default Value	Description
`acceptMessagesWhileStopping`	`false`	< p>Specifies whether the consumer accept messages while it is stopping. You may consider enabling this option, if you start and stop JMS routes at runtime, while there are still messages enqued on the queue. If this option is `false`, and you stop the JMS route, then messages may be rejected, and the JMS broker would have to attempt redeliveries, which yet again may be rejected, and eventually the message may be moved at a dead letter queue on the JMS broker. To avoid this its recommended to enable this option.
`acknowledgementModeName`	`AUTO_ACKNOWLEDGE`	The JMS acknowledgement name, which is one of: `SESSION_TRANSACTED`, `CLIENT_ACKNOWLEDGE`, `AUTO_ACKNOWLEDGE` , `DUPS_OK_ACKNOWLEDGE`
`acknowledgementMode`	`-1`	The JMS acknowledgement mode defined as an Integer. Allows you to set vendor-specific extensions to the acknowledgment mode. For the regular modes, it is preferable to use the `acknowledgementModeName` instead.
`allowNullBody`	`true`	Camel 2.9.3/2.10.1: Whether to allow sending messages with no body. If this option is `false` and the message body is null, then an `JMSException` is thrown.
alwaysCopyMessage	`false`	If `true`, Camel will always make a JMS message copy of the message when it is passed to the producer for sending. Copying the message is needed in some situations, such as when a `replyToDestinationSelectorName` is set (incidentally, Camel will set the `alwaysCopyMessage` option to `true`, if a `replyToDestinationSelectorName` is set)
`asyncConsumer`	`false`	Camel 2.9: Whether the `JmsConsumer` processes the Exchange asynchronously. If enabled then the `JmsConsumer` may pickup the next message from the JMS queue, while the previous message is being processed asynchronously (by the Asynchronous Routing Engine). This means that messages may be processed not 100% strictly in order. If disabled (as default) then the Exchange is fully processed before the `JmsConsumer` will pickup the next message from the JMS queue. Note if `transacted` has been enabled, then `asyncConsumer=true` does not run asynchronously, as transactions must be executed synchronously (Camel 3.0 may support async transactions).
`asyncStartListener`	`false`	Camel 2.10: Whether to startup the `JmsConsumer` message listener asynchronously, when starting a route. For example if a `JmsConsumer` cannot get a connection to a remote JMS broker, then it may block while retrying and/or failover. This will cause Camel to block while starting routes. By setting this option to `true`, you will let routes startup, while the `JmsConsumer` connects to the JMS broker using a dedicated thread in asynchronous mode. If this option is used, then beware that if the connection could not be established, then an exception is logged at `WARN` level, and the consumer will not be able to receive messages; You can then restart the route to retry.
`asyncStopListener`	`false`	Camel 2.10: Whether to stop th e `JmsConsumer` message listener asynchronously, when stopping a route.
`autoStartup`	`true`	Specifies whether the consumer container should auto-startup.
`cacheLevelName`	CACHE_AUTO (Camel >= 2.8.0) CACHE_CONSUMER (Camel <= 2.7.1)	Sets the cache level by name for the underlying JMS resources. Possible values are: `CACHE_AUTO`, `CACHE_CONNECTION`, `CACHE_CONSUMER`, `CACHE_NONE`, and `CACHE_SESSION`. The default setting for Camel 2.8 and newer is CACHE_AUTO. For Camel 2.7.1 and older the default is `CACHE_CONSUMER`. See the Spring documentation and Transactions Cache Levels for more information.
`cacheLevel`		Sets the cache level by ID for the underlying JMS resources. See `cacheLevelName` option for more details.
`consumerType`	`Default`	The consumer type to use, which can be one of: `Simple`, `Default`, or `Custom`. The consumer type determines which Spring JMS listener to use. `Default` will use `org.springframework.jms.listener.DefaultMessageListenerContainer`, `Simple` will use `org.springframework.jms.listener.SimpleMessageListenerContainer`. When `Custom` is specified, the `MessageListenerContainerFactory` defined by the `messageListenerContainerFactoryRef` option will determine what `org.springframework.jms.listener.AbstractMessageListenerContainer` to use (new option in Camel 2.10.2 onwards). This option was temporary removed in Camel 2.7 and 2.8. But has been added back from Camel 2.9 onwards.
`connectionFactory`	`nul l`	The default JMS connection factory to use for the `listenerConnectionFactory` and `templateConnectionFactory`, if neither is specified.
`defaultTaskExecutorType`	(see description)	Camel 2.10.4: Specifies what default TaskExecutor type to use in the DefaultMessageListenerContainer, for both consumer endpoints and the ReplyTo consumer of producer endpoints. Possible values: `SimpleAsync` (uses Spring's SimpleAsyncTaskExecutor) or `ThreadPool` (uses Spring's ThreadPoolTaskExecutor with optimal values - cached threadpool-like). If not set, it defaults to the previous behaviour, which uses a cached thread pool for consumer endpoints and SimpleAsync for reply consumers. The use of `ThreadPool` is recommended to reduce "thread trash" in elastic configurations with dynamically increasing and decreasing concurrent consumers.
`deliveryMode`	null	Camel 2.12.2/2.13: Specifies the delivery mode to be used. Possibles values are those defined by `javax.jms.DeliveryMode`.
deliveryPersistent	`true`	Specifies whether persistent delivery is used by default.
`destination`	`null`	Specifies the JMS Destination object to use on this endpoint.
`destinationName`	`null`	Specifies the JMS destination name to use on this endpoint.
`destinationResolver`	`null`	A pluggable `org.springframework.jms.support.destination.DestinationResolver` that allows you to use your own resolver (for example, to lookup the real destination in a JNDI registry).
`disableTimeToLive`	`false`	Camel 2.8: Use this option to force disabling time to live. For example when you do request/reply over JMS, then Camel will by default use the `requestTimeout` value as time to live on the message being sent. The problem is that the sender and receiver systems have to have their clocks synchronized, so they are in sync. This is not always so easy to archive. So you can use `disableTimeToLive=true` to not set a time to live value on the sent me ssage. Then the message will not expire on the receiver system. See below in section About time to live for more details.
`eagerLoadingOfProperties`	`false`	Enables eager loading of JMS properties as soon as a message is received, which is generally inefficient, because the JMS properties might not be required. But this feature can sometimes catch early any issues with the underlying JMS provider and the use of JMS properties. This feature can also be used for testing purposes, to ensure JMS properties can be understood and handled correctly.
`exceptionListener`	`null`	Specifies the JMS Exception Listener that is to be notified of any underlying JMS exceptions.
`errorHandler`	`null`	Camel 2.8.2, 2.9: Specifies a `org.springframework.util.ErrorHandler` to be invoked in case of any uncaught exceptions thrown while processing a `Message`. By default these exceptions will be logged at the WARN level, if no `errorHandler` has been configured. From Camel 2.9.1: onwards you can configure logging level and whether stack traces should be logged using the below two options. This makes it much easier to configure, than having to code a custom `errorHandler`.
`errorHandlerLoggingLevel`	`WARN`	Camel 2.9.1: Allows to configure the default `errorHandler` logging level for logging uncaught exceptions.
`errorHandlerLogStackTrace`	`true`	Camel 2.9.1: Allows to control whether stacktraces should be logged or not, by the default `errorHandler`.
`explicitQosEnabled`	`false`	Set if the `deliveryMode`, `priority` or `timeToLive` qualities of serv ice should be used when sending messages. This option is based on Spring's `JmsTemplate`. The `deliveryMode`, `priority` and `timeToLive` options are applied to the current endpoint. This contrasts with the `preserveMessageQos` option, which operates at message granularity, reading QoS properties exclusively from the Camel In message headers.
`exposeListenerSession`	`true`	Specifies whether the listener session should be exposed when consuming messages.
`forceSendOriginalMessage`	`false`	Camel 2.7: When using `mapJmsMessage=false` Camel will create a new JMS message to send to a new JMS destination if you touch the headers (get or set) during the route. Set this option to `true` to force Camel to send the original JMS message that was received.
`idleTaskExecutionLimit`	`1`	Specifies the limit for idle executions of a receive task, not having received any message within its execution. If this limit is reached, the task will shut down and leave receiving to other executing tasks (in the case of dynamic scheduling; see the `maxConcurrentConsumers` setting). There is additional doc available from Spring.
`idleConsumerLimit`	`1`	Camel 2.8.2, 2.9: Specify the limit for the number of consumers that are allowed to be idle at any given time.
`includeSentJMSMessageID`	`false`	Camel 2.10.3: Only applicable when sending to JMS destination using InOnly (eg fire and forget). Enabling this option will enrich the Camel Exchange with the actual JMSMessageID that was used by the JMS client when the message was sent to the JMS destination.
`includeAllJMSXProperties`	`false`	Camel 2.11.2/2.12: Whether to include all JMSXxxx properties when mapping from JMS to Camel Message. Setting this to `true` will include properties such as `JMSXAppID`, and `JMSXUserID` etc. Note: If you are using a custom `headerFilterStrategy` then this option does not apply.
`jmsMessageType`	`null`	Allows you to force the use of a specific `javax.jms.Message` implementation for sending JMS messages. Possible values are: `B ytes`, `Map`, `Object`, `Stream`, `Text`. By default, Camel would determine which JMS message type to use from the In body type. This option allows you to specify it.
`jmsKeyFormatStrategy`	`default`	Pluggable strategy for encoding and decoding JMS keys so they can be compliant with the JMS specification. Camel provides two implementations out of the box: `default` and `passthrough`. The `default` strategy will safely marshal dots and hyphens (`.` and `-`). The `passthrough` strategy leaves the key as is. Can be used for JMS brokers which do not care whether JMS header keys contain illegal characters. You can provide your own implementation of the `org.apac he.camel.component.jms.JmsKeyFormatStrategy` and refer to it using the `#` notation.
`jmsOperations`	`null`	Allows you to use your own implementation of the `org.springframework.jms.core.JmsOperations` interface. Camel uses `JmsTemplate` as default. Can be used for testing purpose, but not used much as stated in the spring API docs.
`lazyCreateTransactionManager`	`true`	If `true`, Camel will create a `JmsTransactionManager`, if there is no `transactionManager` injected when option `transacted= true`.
`listenerConnectionFactory`	`null`	The JMS connection factory used for consuming messages.
`mapJmsMessage`	`true`	Specifies whether Camel should auto map the received JMS message to an appropiate payload type, such as `javax.jms.TextMessage` to a `String` etc. See section about how mapping works below for more details.
`maximumBrowseSize`	`-1`	Limits the number of messages fetched at most, when browsing endpoints using Browse or JMX API.
`messageConverter`	`null`	To use a custom Spring `org.springframework.jms.support.converter.MessageConverter` so you can be 100% in control how to map to/from a `javax.jms.Message`.
`messageIdEnabled`	`true`	When sending, specifies whether message IDs should be added.
`messageListenerContainerFactoryRef`	`null`	Camel 2.10.2: Registry ID of the `MessageListenerContainerFactory` used to determine what `org.springframework.jms.listener.AbstractMessageListenerContainer` to use to consume messages. Setting this will automatically set `consumerType` to `Custom`.
`messageTimestampEnabled`	`true`	Specifies whether timestamps should be enabled by default on sending messages.
`password`	`null`	The passwor d for the connector factory.
`priority`	`4`	Values greater than 1 specify the message priority when sending (where 0 is the lowest priority and 9 is the highest). The `explicitQosEnabled` option must also be enabled in order for this option to have any effect.
`pubSubNoLocal`	`false`	Specifies whether to inhibit the delivery of messages published by its own connection.
`receiveTimeout`	1000	The timeout for receiving messages (in milliseconds).
`recoveryInterval`	`5000`	Specifies the interval between recovery attempts, i.e. when a connection is being refreshed, in milliseconds. The default is 5000 ms, that is, 5 seconds.
`replyToCacheLevelName`	CACHE_CONSUMER	Camel 2.9.1: Sets the cache level by name for the reply consumer when doing request/reply over JMS. This option only applies when using fixed reply queues (not temporary). Camel will by default use: `CACHE_CONSUMER` for exclusive or share d w/ `replyToSelectorName`. And `CACHE_SESSION` for shared without `replyToSelectorName`. Some JMS brokers such as IBM WebSphere may require to set the `replyToCacheLevelName=CACHE_NONE` to work. Note: If using temporary queues then `CACHE_NONE` is not allowed, and you must use a higher value such as `CACHE_CONSUMER` or `CACHE_SESSION`.
`replyToDestinationSelectorName`	`null`	Sets the JMS Selector using the fixed name to be used so you can filter out your own replies from the others when using a shared queue (that is, if you are not using a temporary reply queue).
`replyToDeliveryPersistent`	`true`	Specifies whether to use persistent delivery by default for replies.
`requestTimeoutCheckerInterval`	`1000`	Camel 2.9.2: Configures how often Camel should check for timed out Exchanges when doing request/reply over JMS.By default Camel checks once per second. But if you must react faster when a timeout occurs, then you can lower this interval, to check more frequently. The timeout is determined by the option requestTimeout.
`subscriptionDurable`	false	@deprecated: Enabled by default, if you specify a `durableSubscriptionName` and a `clientId`.
`taskExecutor`	`null`	Allows you to specify a custom task executor for consuming messages.
`taskExecutorSpring2`	`null`	Camel 2.6: To use when using Spring 2.x with Camel. Allows you to specify a custom task executor for consuming messages.
`templateConnectionFactory`	`null`	The JMS connection factory used for sending messages.
`transactedInOut`	`false`	@deprecated: Specifies whether to use transacted mode for sending messages using the InOut Exchange Pattern. Applies only to producer endpoints. See section Enabling Transacted Consumption for more details.
`transactionManager`	`null`	The Spring transaction manager to use.
`transactionName`	`"JmsConsumer[destinationName]"`	The name of the transaction to use.
`transactionTimeout`	`null`	The timeout value of the transaction (in seconds), if using transacted mode.
`transferException`	`false`	If enabled and you are using Request Reply messaging (InOut) a nd an Exchange failed on the consumer side, then the caused `Exception` will be send back in response as a `javax.jms.ObjectMessage`. If the client is Camel, the returned `Exception` is rethrown. This allows you to use Camel JMS as a bridge in your routing - for example, using persistent queues to enable robust routing. Notice that if you also have transferExchange enabled, this option takes precedence. The caught exception is required to be serializable. The original `Exception` on the consumer side can be wrapped in an outer exception such as `org.apache.camel.RuntimeCamelException` when returned to the producer.
`transferExchange`	`false`	You can transfer the exchange over the wire instead of just the body and headers. The following fields are transferred: In body, Out body, Fault body, In headers, Out headers, Fault headers, exchange properties, exchange exception. This requires that the objects are serializable. Camel will exclude any non-serializable objects and log it at `WARN` level. You must enable this option on both the producer and consumer side, so Camel knows the payloads is an Exchange and not a regular payload.
`username`	`null`	The username for the connector factory.
`useMessageIDAsCorrelationID`	`false`	Specifies whether `JMSMessageID` should always be used as `JMSCorrelationID` for InOut messages.
`useVersion102`	`false`	@deprecated (removed from Camel 2.5 onwards): Specifies whether the old JMS API should be used.

Message Mapping between JMS and Camel

Camel automatically maps messages between javax.jms.Message and org.apache.camel.Message.

When sending a JMS message, Camel converts the message body to the following JMS message types:

Body Type	JMS Message	Comment
`String`	`javax.jms.TextMessage`
`org.w3c.dom.Node`	`javax.jms.TextMessage`	The DOM will be converted to `String`.
`Map`	`javax.jms.MapMessage`	60;
`java.io.Serializable`	`javax.jms.ObjectMessage`
`byte[]`	`javax.jms.BytesMessage`
`java.io.File`	`javax.jms.BytesMessage`
`java.io.Reader`	`javax.jms.BytesMessage`
`java.io.InputStream`	`javax.jms.BytesMessage`
`java.nio.ByteBuffer`	`javax.jms.BytesMessage`

When receiving a JMS message, Camel converts the JMS message to the following body type:

JMS Message	Body Type
`javax.jms.TextMessage`	`String`
`javax.jms.BytesMessage`	`byte[]`
`javax.jms.MapMessage`	`Map<String, Object>`
`javax.jms.ObjectMessage`	`Object`

Disabling auto-mapping of JMS messages

You can use the mapJmsMessage option to disable the auto-mapping above. If disabled, Camel will not try to map the received JMS message, but inst ead uses it directly as the payload. This allows you to avoid the overhead of mapping and let Camel just pass through the JMS message. For instance, it even allows you to route javax.jms.ObjectMessage JMS messages with classes you do not have on the classpath.

Using a custom MessageConverter

You can use the messageConverter option to do the mapping yourself in a Spring org.springframework.jms.support.converter.MessageConverter class.

For example, in the route below we use a custom message converter when sending a message to the JMS order queue:

URI Options

Header	Java constant	Endpoint type	Value type	Description
`Pah oOriginalMessage`	`PahoConstants.HEADER_ORIGINAL_MESSAGE`	Consumer	`org.eclipse.paho.client.mqttv3.MqttMessage`	The original Paho message instance received by the client.

Option	Default	Description
`clientId`	`camel-<timestamp>`	MQTT client identifier.
`brokerUrl`	`tcp://localhost:1883`	The URL of the MQTT broker.
`persistence`	`memory`	Client persistence to be used - `memory` or `file`.
`qos`	2	Client quality of service level (`0`-`2`).
`connectOptions`	none	The reference to the `org.eclipse.paho.client.mqttv3.MqttConnectOptions` instance located in the Camel registry. Referen ced `MqttConnectOptions` instance will be used by the endpoint to initialize the connection. For example `connectOptions=#myConnectOptions` notation can be used to reference Spring bean named `myConnectOptions.`

For example the convention-over-configuration approach used in Camel is really handy for the most of the situations, but sometimes you would like to have more fine-grained control over the MQTT client connection. To cover such situations just add the bean of type org.eclipse.paho.client.mqttv3.MqttConnectOptions named connectOptions to your Camel registry. For Spring applications that would means adding bean to your application context. The snippet below uses password-based authentication to c onnect to the MQTT broker:

Headers

Header	Java constant	Endpoint type	Value type	Description
`PahoOriginalMessage`	`PahoConstants.HEADER_ORIGINAL_MESSAGE`	Consumer	`org.eclipse.paho.client.mqttv3 .MqttMessage`	The original Paho message instance received by the client.

Most commonly used options

All the other options

Message Mapping between JMS and Camel

Disabling auto-mapping of JMS messages

Using a custom MessageConverter

URI format

Adding the component to the project

Adding the component to the project

URI Options

Headers

Examples

See Also

URI Options

Headers

See Also

Camel RX

Background on RX

Observing events on Camel endpoints

Sending Observable<T> events to Camel endpoints

Embedding some RxJava processing inside a Camel route