How to use a dynamic URI in to()

A dynamic URI is an endpoint URI that varies depending on inflight routing information, such as Exchange properties, message headers, the body, the Camel Context, etc.

For example, if you're using a Freemarker producer and the template location is provided inside the current message, you might expect the following code to work, but it will not.

This is not valid code

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This snippet is not valid code. Read on.

In this case, you must use an EIP (Enterprise Integration Pattern) that is capable of computing a dynamic URI using an Expression, such as the Recipient List EIP pattern.

For example, rewriting the snippet above to use the Simple expression language:

This is valid code

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This snippet is valid code.

Or you could use any other of Camel Languages.

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Notice that the Recipient List can send to multiple Endpoints if the expression returns either a java.util.List, array, java.util.Iteratable or a String. If the returned value is a String then you can specify multiple endpoints separated by comma. So if you only want to send to one endpoint and use a String type, then beware of the comma. If you need to use a comma, then you can change or turn off the separator on the Recipient List.

For example, to turn it, when using Camel 2.13 onwards:

.recipientList(simple("sql:select firstName, lastName from myTable where user = ${header.user}"), "false")

And for users of Camel 2.12.x or older, we use a non existing delimiter char:

.recipientList(simple("sql:select firstName, lastName from myTable where user = ${header.user}"), "@")
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