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8.6. Validate
Overview
The validate pattern provides a convenient syntax to check whether the content of a message is valid. The validate DSL command takes a predicate expression as its sole argument: if the predicate evaluates to
true, the route continues processing normally; if the predicate evaluates to false, a PredicateValidationException is thrown.
Java DSL example
The following route validates the body of the current message using a regular expression:
from("jms:queue:incoming")
.validate(body(String.class).regex("^\\w{10}\\,\\d{2}\\,\\w{24}$"))
.to("bean:MyServiceBean.processLine");
You can also validate a message header—for example:
from("jms:queue:incoming")
.validate(header("bar").isGreaterThan(100))
.to("bean:MyServiceBean.processLine");
And you can use validate with the simple expression language:
from("jms:queue:incoming")
.validate(simple("${in.header.bar} == 100"))
.to("bean:MyServiceBean.processLine");XML DSL example
To use validate in the XML DSL, the recommended approach is to use the simple expression language:
<route>
<from uri="jms:queue:incoming"/>
<validate>
<simple>${body} regex ^\\w{10}\\,\\d{2}\\,\\w{24}$</simple>
</validate>
<beanRef ref="myServiceBean" method="processLine"/>
</route>
<bean id="myServiceBean" class="com.mycompany.MyServiceBean"/>
You can also validate a message header—for example:
<route>
<from uri="jms:queue:incoming"/>
<validate>
<simple>${in.header.bar} == 100</simple>
</validate>
<beanRef ref="myServiceBean" method="processLine"/>
</route>
<bean id="myServiceBean" class="com.mycompany.MyServiceBean"/>