Marshaller (Java Platform SE 8 )
Keywords: javax.xml.bind.Marshaller interface
Date: 2023-01-18

javax.xml.bind

## Interface Marshaller

- All Known Implementing Classes:
    AbstractMarshallerImpl

      public interface Marshaller

  The `Marshaller` class is responsible for governing the process of serializing Java content trees back into XML data. It provides the basic marshalling methods:

  Assume the following setup code for all following code fragments:

  >            JAXBContext jc = JAXBContext.newInstance( "com.acme.foo" );
  >            Unmarshaller u = jc.createUnmarshaller();
  >            Object element = u.unmarshal( new File( "foo.xml" ) );
  >            Marshaller m = jc.createMarshaller();

  Marshalling to a File:

  >            OutputStream os = new FileOutputStream( "nosferatu.xml" );
  >            m.marshal( element, os );

  Marshalling to a SAX ContentHandler:

  >            // assume MyContentHandler instanceof ContentHandler
  >            m.marshal( element, new MyContentHandler() );

  Marshalling to a DOM Node:

  >            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  >            dbf.setNamespaceAware(true);
  >            DocumentBuilder db = dbf.newDocumentBuilder();
  >            Document doc = db.newDocument();

  >            m.marshal( element, doc );

  Marshalling to a java.io.OutputStream:

  >            m.marshal( element, System.out );

  Marshalling to a java.io.Writer:

  >            m.marshal( element, new PrintWriter( System.out ) );

  Marshalling to a javax.xml.transform.SAXResult:

  >            // assume MyContentHandler instanceof ContentHandler
  >            SAXResult result = new SAXResult( new MyContentHandler() );

  >            m.marshal( element, result );

  Marshalling to a javax.xml.transform.DOMResult:

  >            DOMResult result = new DOMResult();

  >            m.marshal( element, result );

  Marshalling to a javax.xml.transform.StreamResult:

  >            StreamResult result = new StreamResult( System.out );

  >            m.marshal( element, result );

  Marshalling to a javax.xml.stream.XMLStreamWriter:

  >            XMLStreamWriter xmlStreamWriter =
  >                XMLOutputFactory.newInstance().createXMLStreamWriter( ... );

  >            m.marshal( element, xmlStreamWriter );

  Marshalling to a javax.xml.stream.XMLEventWriter:

  >            XMLEventWriter xmlEventWriter =
  >                XMLOutputFactory.newInstance().createXMLEventWriter( ... );

  >            m.marshal( element, xmlEventWriter );

  Marshalling content tree rooted by a JAXB element

  > The first parameter of the overloaded `Marshaller.marshal(java.lang.Object, ...)` methods must be a JAXB element as computed by `JAXBIntrospector.isElement(java.lang.Object)`; otherwise, a `Marshaller.marshal` method must throw a `MarshalException`. There exist two mechanisms to enable marshalling an instance that is not a JAXB element. One method is to wrap the instance as a value of a `JAXBElement`, and pass the wrapper element as the first parameter to a `Marshaller.marshal` method. For java to schema binding, it is also possible to simply annotate the instance's class with @`XmlRootElement`.

  Encoding

  > By default, the Marshaller will use UTF-8 encoding when generating XML data to a `java.io.OutputStream`, or a `java.io.Writer`. Use the `setProperty` API to change the output encoding used during these marshal operations. Client applications are expected to supply a valid character encoding name as defined in the W3C XML 1.0 Recommendation and supported by your Java Platform.

  Validation and Well-Formedness

  > Client applications are not required to validate the Java content tree prior to calling any of the marshal API's. Furthermore, there is no requirement that the Java content tree be valid with respect to its original schema in order to marshal it back into XML data. Different JAXB Providers will support marshalling invalid Java content trees at varying levels, however all JAXB Providers must be able to marshal a valid content tree back to XML data. A JAXB Provider must throw a `MarshalException` when it is unable to complete the marshal operation due to invalid content. Some JAXB Providers will fully allow marshalling invalid content, others will fail on the first validation error.

  > Even when schema validation is not explictly enabled for the marshal operation, it is possible that certain types of validation events will be detected during the operation. Validation events will be reported to the registered event handler. If the client application has not registered an event handler prior to invoking one of the marshal API's, then events will be delivered to a default event handler which will terminate the marshal operation after encountering the first error or fatal error. Note that for JAXB 2.0 and later versions, `DefaultValidationEventHandler` is no longer used.

  Supported Properties

  > All JAXB Providers are required to support the following set of properties. Some providers may support additional properties.

  > `jaxb.encoding` - value must be a java.lang.String
  >   The output encoding to use when marshalling the XML data. The Marshaller will use "UTF-8" by default if this property is not specified.
  > `jaxb.formatted.output` - value must be a java.lang.Boolean
  >   This property controls whether or not the Marshaller will format the resulting XML data with line breaks and indentation. A true value for this property indicates human readable indented xml data, while a false value indicates unformatted xml data. The Marshaller will default to false (unformatted) if this property is not specified.
  > `jaxb.schemaLocation` - value must be a java.lang.String
  >   This property allows the client application to specify an xsi:schemaLocation attribute in the generated XML data. The format of the schemaLocation attribute value is discussed in an easy to understand, non-normative form in Section 5.6 of the W3C XML Schema Part 0: Primer and specified in Section 2.6 of the W3C XML Schema Part 1: Structures.
  > `jaxb.noNamespaceSchemaLocation` - value must be a java.lang.String
  >   This property allows the client application to specify an xsi:noNamespaceSchemaLocation attribute in the generated XML data. The format of the schemaLocation attribute value is discussed in an easy to understand, non-normative form in Section 5.6 of the W3C XML Schema Part 0: Primer and specified in Section 2.6 of the W3C XML Schema Part 1: Structures.
  > `jaxb.fragment` - value must be a java.lang.Boolean
  >   This property determines whether or not document level events will be generated by the Marshaller. If the property is not specified, the default is `false`. This property has different implications depending on which marshal api you are using - when this property is set to true:
  >   - `marshal(Object,ContentHandler)` - the Marshaller won't invoke `ContentHandler.startDocument()` and `ContentHandler.endDocument()`.
  >   - `marshal(Object,Node)` - the property has no effect on this API.
  >   - `marshal(Object,OutputStream)` - the Marshaller won't generate an xml declaration.
  >   - `marshal(Object,Writer)` - the Marshaller won't generate an xml declaration.
  >   - `marshal(Object,Result)` - depends on the kind of Result object, see semantics for Node, ContentHandler, and Stream APIs
  >   - `marshal(Object,XMLEventWriter)` - the Marshaller will not generate `XMLStreamConstants.START_DOCUMENT` and `XMLStreamConstants.END_DOCUMENT` events.
  >   - `marshal(Object,XMLStreamWriter)` - the Marshaller will not generate `XMLStreamConstants.START_DOCUMENT` and `XMLStreamConstants.END_DOCUMENT` events.

  Marshal Event Callbacks

  > "The `Marshaller` provides two styles of callback mechanisms that allow application specific processing during key points in the unmarshalling process. In 'class defined' event callbacks, application specific code placed in JAXB mapped classes is triggered during marshalling. 'External listeners' allow for centralized processing of marshal events in one callback method rather than by type event callbacks.

  > Class defined event callback methods allow any JAXB mapped class to specify its own specific callback methods by defining methods with the following method signatures:

  > >        // Invoked by Marshaller after it has created an instance of this object.
  > >        boolean beforeMarshal(Marshaller);

  > >        // Invoked by Marshaller after it has marshalled all properties of this object.
  > >        void afterMarshal(Marshaller);

  > The class defined event callback methods should be used when the callback method requires access to non-public methods and/or fields of the class.

  > The external listener callback mechanism enables the registration of a `Marshaller.Listener` instance with a `setListener(Listener)`. The external listener receives all callback events, allowing for more centralized processing than per class defined callback methods.

  > The 'class defined' and external listener event callback methods are independent of each other, both can be called for one event. The invocation ordering when both listener callback methods exist is defined in `Marshaller.Listener.beforeMarshal(Object)` and `Marshaller.Listener.afterMarshal(Object)`.

  > An event callback method throwing an exception terminates the current marshal process.

  Since:
    JAXB1.0
  See Also:
    `JAXBContext`, `Validator`, `Unmarshaller`

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface and Description
    --- | ---
    `static class` | `Marshaller.Listener` Register an instance of an implementation of this class with a `Marshaller` to externally listen for marshal events.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `JAXB_ENCODING` The name of the property used to specify the output encoding in the marshalled XML data.
    `static String` | `JAXB_FORMATTED_OUTPUT` The name of the property used to specify whether or not the marshalled XML data is formatted with linefeeds and indentation.
    `static String` | `JAXB_FRAGMENT` The name of the property used to specify whether or not the marshaller will generate document level events (ie calling startDocument or endDocument).
    `static String` | `JAXB_NO_NAMESPACE_SCHEMA_LOCATION` The name of the property used to specify the xsi:noNamespaceSchemaLocation attribute value to place in the marshalled XML output.
    `static String` | `JAXB_SCHEMA_LOCATION` The name of the property used to specify the xsi:schemaLocation attribute value to place in the marshalled XML output.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `<A extends XmlAdapter> A` | `getAdapter(Class<A> type)` Gets the adapter associated with the specified type.
    `AttachmentMarshaller` | `getAttachmentMarshaller()`
    `ValidationEventHandler` | `getEventHandler()` Return the current event handler or the default event handler if one hasn't been set.
    `Marshaller.Listener` | `getListener()` Return `Marshaller.Listener` registered with this `Marshaller`.
    `Node` | `getNode(Object contentTree)` Get a DOM tree view of the content tree(Optional).
    `Object` | `getProperty(String name)` Get the particular property in the underlying implementation of `Marshaller`.
    `Schema` | `getSchema()` Get the JAXP 1.3 `Schema` object being used to perform marshal-time validation.
    `void` | `marshal(Object jaxbElement, ContentHandler handler)` Marshal the content tree rooted at `jaxbElement` into SAX2 events.
    `void` | `marshal(Object jaxbElement, File output)` Marshal the content tree rooted at `jaxbElement` into a file.
    `void` | `marshal(Object jaxbElement, Node node)` Marshal the content tree rooted at `jaxbElement` into a DOM tree.
    `void` | `marshal(Object jaxbElement, OutputStream os)` Marshal the content tree rooted at `jaxbElement` into an output stream.
    `void` | `marshal(Object jaxbElement, Result result)` Marshal the content tree rooted at `jaxbElement` into the specified `javax.xml.transform.Result`.
    `void` | `marshal(Object jaxbElement, Writer writer)` Marshal the content tree rooted at `jaxbElement` into a Writer.
    `void` | `marshal(Object jaxbElement, XMLEventWriter writer)` Marshal the content tree rooted at `jaxbElement` into a `XMLEventWriter`.
    `void` | `marshal(Object jaxbElement, XMLStreamWriter writer)` Marshal the content tree rooted at `jaxbElement` into a `XMLStreamWriter`.
    `<A extends XmlAdapter> void` | `setAdapter(Class<A> type, A adapter)` Associates a configured instance of `XmlAdapter` with this marshaller.
    `void` | `setAdapter(XmlAdapter adapter)` Associates a configured instance of `XmlAdapter` with this marshaller.
    `void` | `setAttachmentMarshaller(AttachmentMarshaller am)` Associate a context that enables binary data within an XML document to be transmitted as XML-binary optimized attachment.
    `void` | `setEventHandler(ValidationEventHandler handler)` Allow an application to register a validation event handler.
    `void` | `setListener(Marshaller.Listener listener)` Register marshal event callback `Marshaller.Listener` with this `Marshaller`.
    `void` | `setProperty(String name, Object value)` Set the particular property in the underlying implementation of `Marshaller`.
    `void` | `setSchema(Schema schema)` Specify the JAXP 1.3 `Schema` object that should be used to validate subsequent marshal operations against.

- - ### Field Detail

    - #### JAXB_ENCODING

          static final String JAXB_ENCODING

      The name of the property used to specify the output encoding in the marshalled XML data.
      See Also:
        Constant Field Values

    - #### JAXB_FORMATTED_OUTPUT

          static final String JAXB_FORMATTED_OUTPUT

      The name of the property used to specify whether or not the marshalled XML data is formatted with linefeeds and indentation.
      See Also:
        Constant Field Values

    - #### JAXB_SCHEMA_LOCATION

          static final String JAXB_SCHEMA_LOCATION

      The name of the property used to specify the xsi:schemaLocation attribute value to place in the marshalled XML output.
      See Also:
        Constant Field Values

    - #### JAXB_NO_NAMESPACE_SCHEMA_LOCATION

          static final String JAXB_NO_NAMESPACE_SCHEMA_LOCATION

      The name of the property used to specify the xsi:noNamespaceSchemaLocation attribute value to place in the marshalled XML output.
      See Also:
        Constant Field Values

    - #### JAXB_FRAGMENT

          static final String JAXB_FRAGMENT

      The name of the property used to specify whether or not the marshaller will generate document level events (ie calling startDocument or endDocument).
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### marshal

          void marshal(Object jaxbElement,
                       Result result)
                throws JAXBException

      Marshal the content tree rooted at `jaxbElement` into the specified `javax.xml.transform.Result`.

      All JAXB Providers must at least support `DOMResult`, `SAXResult`, and `StreamResult`. It can support other derived classes of `Result` as well.

      Parameters:
        `jaxbElement` - The root of content tree to be marshalled.
        `result` - XML will be sent to this Result
      Throws:
        `JAXBException` - If any unexpected problem occurs during the marshalling.
        `MarshalException` - If the `ValidationEventHandler` returns false from its `handleEvent` method or the `Marshaller` is unable to marshal `obj` (or any object reachable from `obj`). See Marshalling a JAXB element.
        `IllegalArgumentException` - If any of the method parameters are null

    - #### marshal

          void marshal(Object jaxbElement,
                       OutputStream os)
                throws JAXBException

      Marshal the content tree rooted at `jaxbElement` into an output stream.
      Parameters:
        `jaxbElement` - The root of content tree to be marshalled.
        `os` - XML will be added to this stream.
      Throws:
        `JAXBException` - If any unexpected problem occurs during the marshalling.
        `MarshalException` - If the `ValidationEventHandler` returns false from its `handleEvent` method or the `Marshaller` is unable to marshal `obj` (or any object reachable from `obj`). See Marshalling a JAXB element.
        `IllegalArgumentException` - If any of the method parameters are null

    - #### marshal

          void marshal(Object jaxbElement,
                       File output)
                throws JAXBException

      Marshal the content tree rooted at `jaxbElement` into a file.
      Parameters:
        `jaxbElement` - The root of content tree to be marshalled.
        `output` - File to be written. If this file already exists, it will be overwritten.
      Throws:
        `JAXBException` - If any unexpected problem occurs during the marshalling.
        `MarshalException` - If the `ValidationEventHandler` returns false from its `handleEvent` method or the `Marshaller` is unable to marshal `obj` (or any object reachable from `obj`). See Marshalling a JAXB element.
        `IllegalArgumentException` - If any of the method parameters are null
      Since:
        JAXB2.1

    - #### marshal

          void marshal(Object jaxbElement,
                       Writer writer)
                throws JAXBException

      Marshal the content tree rooted at `jaxbElement` into a Writer.
      Parameters:
        `jaxbElement` - The root of content tree to be marshalled.
        `writer` - XML will be sent to this writer.
      Throws:
        `JAXBException` - If any unexpected problem occurs during the marshalling.
        `MarshalException` - If the `ValidationEventHandler` returns false from its `handleEvent` method or the `Marshaller` is unable to marshal `obj` (or any object reachable from `obj`). See Marshalling a JAXB element.
        `IllegalArgumentException` - If any of the method parameters are null

    - #### marshal

          void marshal(Object jaxbElement,
                       ContentHandler handler)
                throws JAXBException

      Marshal the content tree rooted at `jaxbElement` into SAX2 events.
      Parameters:
        `jaxbElement` - The root of content tree to be marshalled.
        `handler` - XML will be sent to this handler as SAX2 events.
      Throws:
        `JAXBException` - If any unexpected problem occurs during the marshalling.
        `MarshalException` - If the `ValidationEventHandler` returns false from its `handleEvent` method or the `Marshaller` is unable to marshal `obj` (or any object reachable from `obj`). See Marshalling a JAXB element.
        `IllegalArgumentException` - If any of the method parameters are null

    - #### marshal

          void marshal(Object jaxbElement,
                       Node node)
                throws JAXBException

      Marshal the content tree rooted at `jaxbElement` into a DOM tree.
      Parameters:
        `jaxbElement` - The content tree to be marshalled.
        `node` - DOM nodes will be added as children of this node. This parameter must be a Node that accepts children (`Document`, `DocumentFragment`, or `Element`)
      Throws:
        `JAXBException` - If any unexpected problem occurs during the marshalling.
        `MarshalException` - If the `ValidationEventHandler` returns false from its `handleEvent` method or the `Marshaller` is unable to marshal `jaxbElement` (or any object reachable from `jaxbElement`). See Marshalling a JAXB element.
        `IllegalArgumentException` - If any of the method parameters are null

    - #### marshal

          void marshal(Object jaxbElement,
                       XMLStreamWriter writer)
                throws JAXBException

      Marshal the content tree rooted at `jaxbElement` into a `XMLStreamWriter`.
      Parameters:
        `jaxbElement` - The content tree to be marshalled.
        `writer` - XML will be sent to this writer.
      Throws:
        `JAXBException` - If any unexpected problem occurs during the marshalling.
        `MarshalException` - If the `ValidationEventHandler` returns false from its `handleEvent` method or the `Marshaller` is unable to marshal `obj` (or any object reachable from `obj`). See Marshalling a JAXB element.
        `IllegalArgumentException` - If any of the method parameters are null
      Since:
        JAXB 2.0

    - #### marshal

          void marshal(Object jaxbElement,
                       XMLEventWriter writer)
                throws JAXBException

      Marshal the content tree rooted at `jaxbElement` into a `XMLEventWriter`.
      Parameters:
        `jaxbElement` - The content tree rooted at jaxbElement to be marshalled.
        `writer` - XML will be sent to this writer.
      Throws:
        `JAXBException` - If any unexpected problem occurs during the marshalling.
        `MarshalException` - If the `ValidationEventHandler` returns false from its `handleEvent` method or the `Marshaller` is unable to marshal `obj` (or any object reachable from `obj`). See Marshalling a JAXB element.
        `IllegalArgumentException` - If any of the method parameters are null
      Since:
        JAXB 2.0

    - #### getNode

          Node getNode(Object contentTree)
                throws JAXBException

      Get a DOM tree view of the content tree(Optional). If the returned DOM tree is updated, these changes are also visible in the content tree. Use `marshal(Object, org.w3c.dom.Node)` to force a deep copy of the content tree to a DOM representation.
      Parameters:
        `contentTree` - - JAXB Java representation of XML content
      Returns:
        the DOM tree view of the contentTree
      Throws:
        `UnsupportedOperationException` - If the JAXB provider implementation does not support a DOM view of the content tree
        `IllegalArgumentException` - If any of the method parameters are null
        `JAXBException` - If any unexpected problem occurs

    - #### setProperty

          void setProperty(String name,
                           Object value)
                    throws PropertyException

      Set the particular property in the underlying implementation of `Marshaller`. This method can only be used to set one of the standard JAXB defined properties above or a provider specific property. Attempting to set an undefined property will result in a PropertyException being thrown. See Supported Properties.
      Parameters:
        `name` - the name of the property to be set. This value can either be specified using one of the constant fields or a user supplied string.
        `value` - the value of the property to be set
      Throws:
        `PropertyException` - when there is an error processing the given property or value
        `IllegalArgumentException` - If the name parameter is null

    - #### getProperty

          Object getProperty(String name)
                      throws PropertyException

      Get the particular property in the underlying implementation of `Marshaller`. This method can only be used to get one of the standard JAXB defined properties above or a provider specific property. Attempting to get an undefined property will result in a PropertyException being thrown. See Supported Properties.
      Parameters:
        `name` - the name of the property to retrieve
      Returns:
        the value of the requested property
      Throws:
        `PropertyException` - when there is an error retrieving the given property or value property name
        `IllegalArgumentException` - If the name parameter is null

    - #### setEventHandler

          void setEventHandler(ValidationEventHandler handler)
                        throws JAXBException

      Allow an application to register a validation event handler.

      The validation event handler will be called by the JAXB Provider if any validation errors are encountered during calls to any of the marshal API's. If the client application does not register a validation event handler before invoking one of the marshal methods, then validation events will be handled by the default event handler which will terminate the marshal operation after the first error or fatal error is encountered.

      Calling this method with a null parameter will cause the Marshaller to revert back to the default default event handler.

      Parameters:
        `handler` - the validation event handler
      Throws:
        `JAXBException` - if an error was encountered while setting the event handler

    - #### getEventHandler

          ValidationEventHandler getEventHandler()
                                          throws JAXBException

      Return the current event handler or the default event handler if one hasn't been set.
      Returns:
        the current ValidationEventHandler or the default event handler if it hasn't been set
      Throws:
        `JAXBException` - if an error was encountered while getting the current event handler

    - #### setAdapter

          void setAdapter(XmlAdapter adapter)

      Associates a configured instance of `XmlAdapter` with this marshaller.

      This is a convenience method that invokes `setAdapter(adapter.getClass(),adapter);`.

      Throws:
        `IllegalArgumentException` - if the adapter parameter is null.
        `UnsupportedOperationException` - if invoked agains a JAXB 1.0 implementation.
      Since:
        JAXB 2.0
      See Also:
        `setAdapter(Class,XmlAdapter)`

    - #### setAdapter

          <A extends XmlAdapter> void setAdapter(Class<A> type,
                                                 A adapter)

      Associates a configured instance of `XmlAdapter` with this marshaller.

      Every marshaller internally maintains a `Map`<`Class`,`XmlAdapter`>, which it uses for marshalling classes whose fields/methods are annotated with `XmlJavaTypeAdapter`.

      This method allows applications to use a configured instance of `XmlAdapter`. When an instance of an adapter is not given, a marshaller will create one by invoking its default constructor.

      Parameters:
        `type` - The type of the adapter. The specified instance will be used when `XmlJavaTypeAdapter.value()` refers to this type.
        `adapter` - The instance of the adapter to be used. If null, it will un-register the current adapter set for this type.
      Throws:
        `IllegalArgumentException` - if the type parameter is null.
        `UnsupportedOperationException` - if invoked agains a JAXB 1.0 implementation.
      Since:
        JAXB 2.0

    - #### getAdapter

          <A extends XmlAdapter> A getAdapter(Class<A> type)

      Gets the adapter associated with the specified type. This is the reverse operation of the `setAdapter(javax.xml.bind.annotation.adapters.XmlAdapter)` method.
      Throws:
        `IllegalArgumentException` - if the type parameter is null.
        `UnsupportedOperationException` - if invoked agains a JAXB 1.0 implementation.
      Since:
        JAXB 2.0

    - #### setAttachmentMarshaller

          void setAttachmentMarshaller(AttachmentMarshaller am)

      Associate a context that enables binary data within an XML document to be transmitted as XML-binary optimized attachment. The attachment is referenced from the XML document content model by content-id URIs(cid) references stored within the xml document.

      Throws:
        `IllegalStateException` - if attempt to concurrently call this method during a marshal operation.

    - #### getAttachmentMarshaller

          AttachmentMarshaller getAttachmentMarshaller()

    - #### setSchema

          void setSchema(Schema schema)

      Specify the JAXP 1.3 `Schema` object that should be used to validate subsequent marshal operations against. Passing null into this method will disable validation.

      This method allows the caller to validate the marshalled XML as it's marshalled.

      Initially this property is set to `null`.

      Parameters:
        `schema` - Schema object to validate marshal operations against or null to disable validation
      Throws:
        `UnsupportedOperationException` - could be thrown if this method is invoked on an Marshaller created from a JAXBContext referencing JAXB 1.0 mapped classes
      Since:
        JAXB2.0

    - #### getSchema

          Schema getSchema()

      Get the JAXP 1.3 `Schema` object being used to perform marshal-time validation. If there is no Schema set on the marshaller, then this method will return null indicating that marshal-time validation will not be performed.
      Returns:
        the Schema object being used to perform marshal-time validation or null if not present.
      Throws:
        `UnsupportedOperationException` - could be thrown if this method is invoked on an Marshaller created from a JAXBContext referencing JAXB 1.0 mapped classes
      Since:
        JAXB2.0

    - #### setListener

          void setListener(Marshaller.Listener listener)

      Register marshal event callback `Marshaller.Listener` with this `Marshaller`.

      There is only one Listener per Marshaller. Setting a Listener replaces the previous set Listener. One can unregister current Listener by setting listener to `null`.

      Parameters:
        `listener` - an instance of a class that implements `Marshaller.Listener`
      Since:
        JAXB2.0

    - #### getListener

          Marshaller.Listener getListener()

      Return `Marshaller.Listener` registered with this `Marshaller`.

      Returns:
        registered `Marshaller.Listener` or `null` if no Listener is registered with this Marshaller.
      Since:
        JAXB2.0

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