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Chapter 44. JSLT

Query or transform JSON payloads using an JSLT.

44.1. What’s inside
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Please refer to the above link for usage and configuration details.

44.2. Maven coordinates
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Create a new project with this extension on code.quarkus.redhat.com

Or add the coordinates to your existing project: 

<dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifactId>camel-quarkus-jslt</artifactId>
</dependency>
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44.3. allowContextMapAll option in native mode
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The allowContextMapAll option is not supported in native mode as it requires reflective access to security sensitive camel core classes such as CamelContext & Exchange. This is considered a security risk and thus access to the feature is not provided by default.

44.4. Additional Camel Quarkus configuration
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44.4.1. Loading JSLT templates from classpath in native mode
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This component typically loads the templates from classpath. To make it work also in native mode, you need to explicitly embed the templates files in the native executable by using the quarkus.native.resources.includes property.

For instance, the route below would load the JSLT schema from a classpath resource named transformation.json: 

from("direct:start").to("jslt:transformation.json");
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To include this (an possibly other templates stored in .json files) in the native image, you would have to add something like the following to your application.properties file: 

quarkus.native.resources.includes = *.json
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44.4.2. Using JSLT functions in native mode
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When using JSLT functions from camel-quarkus in native mode, the classes hosting the functions would need to be registered for reflection. When registering the target function is not possible, one may end up writing a stub as below. 

@RegisterForReflection
public class MathFunctionStub {
    public static double pow(double a, double b) {
        return java.lang.Math.pow(a, b);
    }
}
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The target function Math.pow(…​) is now accessible through the MathFunctionStub class that could be registered in the component as below: 

@Named
JsltComponent jsltWithFunction() throws ClassNotFoundException {
    JsltComponent component = new JsltComponent();
    component.setFunctions(singleton(wrapStaticMethod("power", "org.apache.cq.example.MathFunctionStub", "pow")));
    return component;
}
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