How to set a Camel property as a List or Array in Spring XML

Question

I am developing a simple processor to verify the existence of mandatory properties in a route. I need to add that list on the route definition before calling the processor.

    <route id="test1">
        <from uri="/v1/test1" />
        <setProperty propertyName="mandatoryProperties">
            <simple resultType="java.util.List">${[A,B,C]}</simple>
        </setProperty>
        <bean ref="propertiesProcessor" />
    </route>

My Processor is:

@Component
public class MandatoryPropertiesProcessor {

@Handler
public void process(final Exchange exchange, final @Properties Map properties, final @ExchangeProperty("mandatoryProperties") List<String> mandatoryProperties) {

    List<String> missingPropertiesList = new ArrayList<>();

    if (!CollectionUtils.isEmpty(mandatoryProperties)) {

        for (String mandatoryProperty : mandatoryProperties) {

            if (!properties.containsKey(mandatoryProperty)) {
                missingPropertiesList.add(mandatoryProperty);
            }
        }
    }

    exchange.setProperty(MISSING_PROPERTIES, missingPropertiesList);
}

}

when i try to call this route i get:

Caused by: org.apache.camel.language.simple.types.SimpleParserException: Unknown function: ["A","B","C"]
    at org.apache.camel.language.simple.ast.SimpleFunctionExpression.createSimpleExpression(SimpleFunctionExpression.java:216)
    at org.apache.camel.language.simple.ast.SimpleFunctionExpression.createExpression(SimpleFunctionExpression.java:40)
    at org.apache.camel.language.simple.ast.SimpleFunctionStart.doCreateLiteralExpression(SimpleFunctionStart.java:58)
    at org.apache.camel.language.simple.ast.SimpleFunctionStart.createExpression(SimpleFunctionStart.java:48)
    at org.apache.camel.language.simple.SimpleExpressionParser.createExpressions(SimpleExpressionParser.java:163)
    at org.apache.camel.language.simple.SimpleExpressionParser.doParseExpression(SimpleExpressionParser.java:86)
    at org.apache.camel.language.simple.SimpleExpressionParser.parseExpression(SimpleExpressionParser.java:53)

Is possible to achieve this in XML?

@pvpkiran i have removed the $ and now i do not have any errors, but the header does not exist. — João Gomes, Mar 08 '18 at 14:48
Do you want to have an ArrayList with 3 values: A, B and C. You can use groovy or some more powerful scripting languages to initialize such thing — Claus Ibsen, Mar 09 '18 at 09:44
@ClausIbsen so it's not possible to do that with simple? unfortunately i am not allowed to add any library. — João Gomes, Mar 12 '18 at 08:50
You can create a `ArrayList` bean outside Camel using the `` syntax. Both spring XML and blueprint XML has ways of doing that. Then you can use the ref language to set the bean as an exchange property in the Camel route. — Claus Ibsen, Mar 12 '18 at 11:32

score 0 · Answer 1 · answered Mar 09 '18 at 12:38

0

You seem to use Spring Framework and the mandatory properties seem to be a static list, right?

If so, just use Spring configuration to create the list or any other collection of mandatory properties and inject it into your MandatoryPropertiesProcessor bean. No Camel at all for this part.

If the list changes, only the config and the bean change, but not your Camel route. This is reasonable since the "processing workflow" implemented through your route does not change.

answered Mar 09 '18 at 12:38

burki

6,741
1
15
31

It seems a good idea but with this solution i cant reuse the processor in another route because each one has different mandatory parameters. – João Gomes Mar 12 '18 at 08:52
1

Why? You can configure multiple instances of the same bean class with Spring and inject them into the corresponding routes. – burki Mar 12 '18 at 08:58

How to set a Camel property as a List or Array in Spring XML

1 Answers1