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"/>