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null3 Allows you to use a custom javax.xml.transformation.URIResolver. Camel will by default use its own implementation builderxmlXsltUriResolver which is capable of loading from classpath.Camel 2.3: Allows you to use a custom ResultHandlerFactory which is capable of using custom org.apache.camel.builder.xml.ResultHandler types.

Name	Default Value	Description
`converter`	`null`	Option to override default XmlConverter. Will lookup for the converter in the Registry. The provided converted must be of type org.apache.camel.converter.jaxp.XmlConverter.
`transformerFactory`	`null`	Option to override default TransformerFactory. Will lookup for the transformerFactory in the Registry. The provided transformer factory must be of type javax.xml.transform.TransformerFactory.
`transformerFactoryClass`	`null`	Option to override default TransformerFactory. Will create a TransformerFactoryClass instance and set it to the converter.`uriResolver`
`uriResolverFactory`	`DefaultXsltUriResolverFactory`	Camel 2.	17:	Reference to a `org.apache.camel.component.xslt.XsltUriResolverFactory` which creates an URI resolver per endpoint`.`The default implementation returns an instance of `org.apache.camel.`	`component.`	`xslt.`	`resultHandlerFactory`	`null`	`DefaultXsltUriResolverFactory` which creates the default URI resolver `org.apache.camel.builder.xml`.
`failOnNullBody`	`true`	Camel 2.3: Whether or not to throw an exception if the input body is null.
`deleteOutputFile`	`false`	Camel 2.6: If you have `output=file` then this option dictates whether or not the output file should be deleted when the Exchange is done processing. For example suppose the output file is a temporary file, then it can be a good idea to delete it after use.
`output`	`string`	Camel 2.3: Option to specify which output type to use. Possible values are: `string, bytes, DOM, file`. The first three options are all in memory based, where as `file` is streamed directly to a `java.io.File`. For `file` you must specify the filename in the IN header with the key `Exchange.XSLT_FILE_NAME` which is also `CamelXsltFileName`. Also any paths leading to the filename must be created beforehand, otherwise an exception is thrown at runtime.
`contentCache`	`true`	Camel 2.6: Cache for the resource content (the stylesheet file) when it is loaded. If set to `false` Camel will reload the stylesheet file on each message processing. This is good for development. Note: from Camel 2.9 a cached stylesheet can be forced to reload at runtime via JMX using the `clearCachedStylesheet` operation.
`allowStAX`		Camel 2.8.3/2.9: Whether to allow using StAX as the `javax.xml.transform.Source`. The option is default `false` in Camel 2.11.3/2.12.2 or older. And default `true` in Camel 2.11.4/2.12.3 onwards.
`transformerCacheSize`	`0`	Camel 2.9.3/2.10.1: The number of `javax.xml.transform.Transformer` object that are cached for reuse to avoid calls to `Template.newTransformer()`.
`saxon`	`false`	Camel 2.11: Whether to use Saxon as the `transformerFactoryClass`. If enabled then the class `net.sf.saxon.TransformerFactoryImpl`. You would need to add Saxon to the classpath.
errorListener		Camel 2.14: Allows to configure to use a custom `javax.xml.transform.ErrorListener`.

Using XSLT endpoints

For example you could use something like

Code Block
from("activemq:My.Queue"). to("xslt:com/acme/mytransform.xsl");

To use an XSLT template to formulate a response for a message for InOut message exchanges (where there is a JMSReplyTo header).

If you want to use InOnly and consume the message and send it to another destination you could use the following route:

Code Block
from("activemq:My.Queue"). to("xslt:com/acme/mytransform.xsl"). to("activemq:Another.Queue");

Getting Parameters into the XSLT to work with

By default, all headers are added as parameters which are available in the XSLT.
To do this you will need to declare the parameter so it is then useable.

...

<setHeader headerName="myParam"><constant>42</constant></setHeader>
<to uri="xslt:MyTransform.xsl"/>

And the XSLT just needs to declare it at the top level for it to be available:

...

<xsl: ...... >

   <xsl:param name="myParam"/>
  
    <xsl:template ...>

Spring XML versions

To use the above examples in Spring XML you would use something like

...

  <camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
    <route>
      <from uri="activemq:My.Queue"/>
      <to uri="xslt:org/apache/camel/spring/processor/example.xsl"/>
      <to uri="activemq:Another.Queue"/>
    </route>
  </camelContext>

XsltUriResolver per endpoint. The default URI resolver reads XSLT documents from the classpath and the file system. This option instead of the option `uriResolver` shall be used when the URI resolver depends on the resource URI of the root XSLT document specified in the endpoint; for example, if you want to extend the default URI resolver. This option is also available on the XSLT component, so that you can set the resource resolver factory only once for all endpoints.
`uriResolver`	`null`	Camel 2.3: Allows you to use a custom `javax.xml.transformation.URIResolver`. Camel will by default use its own implementation `org.apache.camel.builder.xml.XsltUriResolver` which is capable of loading from classpath.
`resultHandlerFactory`	`null`	Camel 2.3: Allows you to use a custom `org.apache.camel.builder.xml.ResultHandlerFactory` which is capable of using custom `org.apache.camel.builder.xml.ResultHandler` types.
`failOnNullBody`	`true`	Camel 2.3: Whether or not to throw an exception if the input body is null.
`deleteOutputFile`	`false`	Camel 2.6: If you have `output=file` then this option dictates whether or not the output file should be deleted when the Exchange is done processing. For example suppose the output file is a temporary file, then it can be a good idea to delete it after use.
`output`	`string`	Camel 2.3: Option to specify which output type to use. Possible values are: `string, bytes, DOM, file`. The first three options are all in memory based, where as `file` is streamed directly to a `java.io.File`. For `file` you must specify the filename in the IN header with the key `Exchange.XSLT_FILE_NAME` which is also `CamelXsltFileName`. Also any paths leading to the filename must be created beforehand, otherwise an exception is thrown at runtime.
`contentCache`	`true`	Camel 2.6: Cache for the resource content (the stylesheet file) when it is loaded. If set to `false` Camel will reload the stylesheet file on each message processing. This is good for development. Note: from Camel 2.9 a cached stylesheet can be forced to reload at runtime via JMX using the `clearCachedStylesheet` operation.
`allowStAX`		Camel 2.8.3/2.9: Whether to allow using StAX as the `javax.xml.transform.Source`. The option is default `false` in Camel 2.11.3/2.12.2 or older. And default `true` in Camel 2.11.4/2.12.3 onwards.
`transformerCacheSize`	`0`	Camel 2.9.3/2.10.1: The number of `javax.xml.transform.Transformer` object that are cached for reuse to avoid calls to `Template.newTransformer()`.
`saxon`	`false`	Camel 2.11: Whether to use Saxon as the `transformerFactoryClass`. If enabled then the class `net.sf.saxon.TransformerFactoryImpl`. You would need to add Saxon to the classpath.
`saxonExtensionFunctions`	`null`	Camel 2.17: Allows to configure one or more custom net.sf.saxon.lib.ExtensionFunctionDefinition. You would need to add Saxon to the classpath. By setting this option, saxon option will be turned out automatically.
`errorListener`		Camel 2.14: Allows to configure to use a custom `javax.xml.transform.ErrorListener`. Beware when doing this then the default error listener which captures any errors or fatal errors and store information on the Exchange as properties is not in use. So only use this option for special use-cases.
`entityResolver`		Camel 2.18: To use a custom org.xml.sax.EntityResolver with javax.xml.transform.sax.SAXSource.

Using XSLT endpoints

For example you could use something like

Code Block
from("activemq:My.Queue"). to("xslt:com/acme/mytransform.xsl");

To use an XSLT template to formulate a response for a message for InOut message exchanges (where there is a JMSReplyTo header).

If you want to use InOnly and consume the message and send it to another destination you could use the following route:

Code Block
from("activemq:My.Queue"). to("xslt:com/acme/mytransform.xsl"). to("activemq:Another.Queue");

Getting Parameters into the XSLT to work with

By default, all headers are added as parameters which are available in the XSLT.
To do this you will need to declare the parameter so it is then useable.

Code Block

	xml
	xml

<setHeader headerName="myParam"><constant>42</constant></setHeader>
<to uri="xslt:MyTransform.xsl"/>

And the XSLT just needs to declare it at the top level for it to be available:

Code Block

	xml
	xml

<xsl: ...... >

   <xsl:param name="myParam"/>
  
    <xsl:template ...>

Spring XML versions

To use the above examples in Spring XML you would use something like

Code Block

	xml
	xml

  <camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
    <route>
      <from uri="activemq:My.Queue"/>
      <to uri="xslt:org/apache/camel/spring/processor/example.xsl"/>
      <to uri="activemq:Another.Queue"/>
    </route>
  </camelContext>

There is a test case along with its Spring XML if you want a concrete example.

Using xsl:include

Camel 2.2 or older
If you use xsl:include in your XSL files then in Camel 2.2 or older it uses the default javax.xml.transform.URIResolver which means it can only lookup files from file system, and its does that relative from the JVM starting folder.

For example this include:

Code Block

	xml
	xml

<xsl:include href="staff_template.xsl"/>

Will lookup the staff_tempkalte.xsl file from the starting folder where the application was started.

Camel 2.3 or newer
Now Camel provides its own implementation of URIResolver which allows Camel to load included files from the classpath and more intelligent than before.

For example this include:

Code Block

	xml
	xml

<xsl:include href="staff_template.xsl"/>

Will now be located relative from the starting endpoint, which for example could be:

Code Block
.to("xslt:org/apache/camel/component/xslt/staff_include_relative.xsl")

Which means Camel will locate the file in the classpath as org/apache/camel/component/xslt/staff_template.xsl.
This allows you to use xsl include and have xsl files located in the same folder such as we do in the example org/apache/camel/component/xslt.

You can use the following two prefixes classpath: or file: to instruct Camel to look either in classpath or file system. If you omit the prefix then Camel uses the prefix from the endpoint configuration. If that neither has one, then classpath is assumed.

You can also refer back in the paths such as

Code Block
<xsl:include href="../staff_other_template.xsl"/>

Which then will resolve the xsl file under org/apache/camel/component.

Using xsl:include and default prefix

When using xsl:include such as:

Code Block

	xml
	xml

<xsl:include href="staff_template.xsl"/>

Then in Camel 2.10.3 and older, then Camel will use "classpath:" as the default prefix, and load the resource from the classpath. This works for most cases, but if you configure the starting resource to load from file,

Code Block
.to("xslt:file:etc/xslt/staff_include_relative.xsl")

.. then you would have to prefix all your includes with "file:" as well.

There is a test case along with its Spring XML if you want a concrete example.

Using xsl:include

Camel 2.2 or older
If you use xsl:include in your XSL files then in Camel 2.2 or older it uses the default javax.xml.transform.URIResolver which means it can only lookup files from file system, and its does that relative from the JVM starting folder.

For example this include:

Code Block

	xml
	xml

<xsl:include href="staff_template.xsl"/>

...

file:staff_

...

template.xsl

...

"/>

From Camel 2.10.4 onwards we have made this easier as Camel will use the prefix from the endpoint configuration as the default prefix. So from Camel 2.10.4 onwards you can do

Camel 2.3 or newer
Now Camel provides its own implementation of URIResolver which allows Camel to load included files from the classpath and more intelligent than before.

For example this include:

Code Block

	xml
	xml

<xsl:include href="staff_template.xsl"/>

Will now be located relative from the starting endpoint, which for example could be:

Code Block
.to("xslt:org/apache/camel/component/xslt/staff_include_relative.xsl")

Which means Camel will locate the file in the classpath as org/apache/camel/component/xslt/staff_template.xsl.
This allows you to use xsl include and have xsl files located in the same folder such as we do in the example org/apache/camel/component/xslt.

You can use the following two prefixes classpath: or file: to instruct Camel to look either in classpath or file system. If you omit the prefix then Camel uses the prefix from the endpoint configuration. If that neither has one, then classpath is assumed.

You can also refer back in the paths such as

Code Block
<xsl:include href="../staff_other_template.xsl"/>

Which then will resolve the xsl file under org/apache/camel/component.

Using xsl:include and default prefix

When using xsl:include such as:

...

<xsl:include href="staff_template.xsl"/>

Then in Camel 2.10.3 and older, then Camel will use "classpath:" as the default prefix, and load the resource from the classpath. This works for most cases, but if you configure the starting resource to load from file,

Code Block
.to("xslt:file:etc/xslt/staff_include_relative.xsl")

.. then you would have to prefix all your includes with "file:" as well.

...

<xsl:include href="file:staff_template.xsl"/>

="staff_template.xsl"/>

Which will load the staff_template.xsl resource from the file system, as the endpoint was configured with "file:" as prefix.
You can still though explicit configure a prefix, and then mix and match. And have both file and classpath loading. But that would be unusual, as most people either use file or classpath based resources.

Using Saxon extension functions

Since Saxon 9.2, writing extension functions has been supplemented by a new mechanism, referred to as integrated extension functions you can now easily use camel:

- Java example:

Code Block

language	java

SimpleRegistry registry = new SimpleRegistry();
registry.put("function1", new MyExtensionFunction1());
registry.put("function2", new MyExtensionFunction2());

CamelContext context = new DefaultCamelContext(registry);
context.addRoutes(new RouteBuilder() {
    @Override
    public void configure() throws Exception {
        from("direct:start")
            .to("xslt:org/apache/camel/component/xslt/extensions/extensions.xslt?saxonExtensionFunctions=#function1,#function2");
    }
});

Spring example:

Code Block

language	xml

<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="direct:extensions"/>
    <to uri="xslt:org/apache/camel/component/xslt/extensions/extensions.xslt?saxonExtensionFunctions=#function1,#function2"/>
  </route>
</camelContext>


<bean id="function1" class="org.apache.camel.component.xslt.extensions.MyExtensionFunction1"/>
<bean id="function2" class="org.apache.camel.component.xslt.extensions.MyExtensionFunction2"/>

From Camel 2.10.4 onwards we have made this easier as Camel will use the prefix from the endpoint configuration as the default prefix. So from Camel 2.10.4 onwards you can do:

...

<xsl:include href="staff_template.xsl"/>

Which will load the staff_template.xsl resource from the file system, as the endpoint was configured with "file:" as prefix.
You can still though explicit configure a prefix, and then mix and match. And have both file and classpath loading. But that would be unusual, as most people either use file or classpath based resources.

Dynamic stylesheets

To provide a dynamic stylesheet at runtime you can define a dynamic URI. See How to use a dynamic URI in to() for more information.

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Versions Compared

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Key

Using XSLT endpoints

Getting Parameters into the XSLT to work with

Spring XML versions

Using XSLT endpoints

Getting Parameters into the XSLT to work with

Spring XML versions

Using xsl:include

Using xsl:include and default prefix

Using xsl:include

Using xsl:include and default prefix

Using Saxon extension functions

Dynamic stylesheets