Chapter 172. JOLT Component

Available as of Camel version 2.16

The jolt: component allows you to process a JSON messages using an JOLT specification. This can be ideal when doing JSON to JSON transformation.

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jolt</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
 

172.1. URI format

jolt:specName[?options]

Where specName is the classpath-local URI of the specification to invoke; or the complete URL of the remote specification (eg: file://folder/myfile.vm[file://folder/myfile.json]).

You can append query options to the URI in the following format, ?option=value&option=value&…​

172.2. Options

The JOLT component supports 2 options which are listed below.

NameDescriptionDefaultType

transform (advanced)

Explicitly sets the Transform to use. If not set a Transform specified by the transformDsl will be created

 

Transform

resolveProperty Placeholders (advanced)

Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders.

true

boolean

The JOLT endpoint is configured using URI syntax:

jolt:resourceUri

with the following path and query parameters:

172.2.1. Path Parameters (1 parameters):

NameDescriptionDefaultType

resourceUri

Required Path to the resource. You can prefix with: classpath, file, http, ref, or bean. classpath, file and http loads the resource using these protocols (classpath is default). ref will lookup the resource in the registry. bean will call a method on a bean to be used as the resource. For bean you can specify the method name after dot, eg bean:myBean.myMethod.

 

String

172.2.2. Query Parameters (5 parameters):

NameDescriptionDefaultType

contentCache (producer)

Sets whether to use resource content cache or not

false

boolean

inputType (producer)

Specifies if the input is hydrated JSON or a JSON String.

Hydrated

JoltInputOutputType

outputType (producer)

Specifies if the output should be hydrated JSON or a JSON String.

Hydrated

JoltInputOutputType

transformDsl (producer)

Specifies the Transform DSL of the endpoint resource. If none is specified Chainr will be used.

Chainr

JoltTransformType

synchronous (advanced)

Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported).

false

boolean

172.3. Samples

For example you could use something like

from("activemq:My.Queue").
  to("jolt:com/acme/MyResponse.json");

And a file based resource:

from("activemq:My.Queue").
  to("jolt:file://myfolder/MyResponse.json?contentCache=true").
  to("activemq:Another.Queue");

You can also specify what specification the component should use dynamically via a header, so for example:

from("direct:in").
  setHeader("CamelJoltResourceUri").constant("path/to/my/spec.json").
  to("jolt:dummy");
 

172.4. See Also

  • Configuring Camel
  • Component
  • Endpoint
  • Getting Started