XMLOutputFactory (Java Platform SE 8 )
Keywords: javax.xml.stream.XMLOutputFactory class
Date: 2026-03-29

compact2, compact3
javax.xml.stream

## Class XMLOutputFactory

- java.lang.Object
- - javax.xml.stream.XMLOutputFactory

-     public abstract class XMLOutputFactory
      extends Object

  Defines an abstract implementation of a factory for getting XMLEventWriters and XMLStreamWriters. The following table defines the standard properties of this specification. Each property varies in the level of support required by each implementation. The level of support required is described in the 'Required' column.

  Configuration parameters
  Property Name | Behavior | Return type | Default Value | Required
  --- | --- | --- | --- | ---
  javax.xml.stream.isRepairingNamespaces | defaults prefixes on the output side | Boolean | False | Yes

  The following paragraphs describe the namespace and prefix repair algorithm:

  The property can be set with the following code line: `setProperty("javax.xml.stream.isRepairingNamespaces",new Boolean(true|false));`

  This property specifies that the writer default namespace prefix declarations. The default value is false.

  If a writer isRepairingNamespaces it will create a namespace declaration on the current StartElement for any attribute that does not currently have a namespace declaration in scope. If the StartElement has a uri but no prefix specified a prefix will be assigned, if the prefix has not been declared in a parent of the current StartElement it will be declared on the current StartElement. If the defaultNamespace is bound and in scope and the default namespace matches the URI of the attribute or StartElement QName no prefix will be assigned.

  If an element or attribute name has a prefix, but is not bound to any namespace URI, then the prefix will be removed during serialization.

  If element and/or attribute names in the same start or empty-element tag are bound to different namespace URIs and are using the same prefix then the element or the first occurring attribute retains the original prefix and the following attributes have their prefixes replaced with a new prefix that is bound to the namespace URIs of those attributes.

  If an element or attribute name uses a prefix that is bound to a different URI than that inherited from the namespace context of the parent of that element and there is no namespace declaration in the context of the current element then such a namespace declaration is added.

  If an element or attribute name is bound to a prefix and there is a namespace declaration that binds that prefix to a different URI then that namespace declaration is either removed if the correct mapping is inherited from the parent context of that element, or changed to the namespace URI of the element or attribute using that prefix.

  Since:
    1.6
  Version:
    1.2
  See Also:
    `XMLInputFactory`, `XMLEventWriter`, `XMLStreamWriter`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `IS_REPAIRING_NAMESPACES` Property used to set prefix defaulting on the output side

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `XMLOutputFactory()`

  - ### Method Summary

    All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract XMLEventWriter` | `createXMLEventWriter(OutputStream stream)` Create a new XMLEventWriter that writes to a stream
    `abstract XMLEventWriter` | `createXMLEventWriter(OutputStream stream, String encoding)` Create a new XMLEventWriter that writes to a stream
    `abstract XMLEventWriter` | `createXMLEventWriter(Result result)` Create a new XMLEventWriter that writes to a JAXP result.
    `abstract XMLEventWriter` | `createXMLEventWriter(Writer stream)` Create a new XMLEventWriter that writes to a writer
    `abstract XMLStreamWriter` | `createXMLStreamWriter(OutputStream stream)` Create a new XMLStreamWriter that writes to a stream
    `abstract XMLStreamWriter` | `createXMLStreamWriter(OutputStream stream, String encoding)` Create a new XMLStreamWriter that writes to a stream
    `abstract XMLStreamWriter` | `createXMLStreamWriter(Result result)` Create a new XMLStreamWriter that writes to a JAXP result.
    `abstract XMLStreamWriter` | `createXMLStreamWriter(Writer stream)` Create a new XMLStreamWriter that writes to a writer
    `abstract Object` | `getProperty(String name)` Get a feature/property on the underlying implementation
    `abstract boolean` | `isPropertySupported(String name)` Query the set of properties that this factory supports.
    `static XMLOutputFactory` | `newFactory()` Create a new instance of the factory.
    `static XMLOutputFactory` | `newFactory(String factoryId, ClassLoader classLoader)` Create a new instance of the factory.
    `static XMLOutputFactory` | `newInstance()` Creates a new instance of the factory in exactly the same manner as the `newFactory()` method.
    `static XMLInputFactory` | `newInstance(String factoryId, ClassLoader classLoader)` Deprecated. This method has been deprecated because it returns an instance of XMLInputFactory, which is of the wrong class. Use the new method `newFactory(java.lang.String, java.lang.ClassLoader)` instead.
    `abstract void` | `setProperty(String name, Object value)` Allows the user to set specific features/properties on the underlying implementation.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### IS_REPAIRING_NAMESPACES

          public static final String IS_REPAIRING_NAMESPACES

      Property used to set prefix defaulting on the output side
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### XMLOutputFactory

          protected XMLOutputFactory()

  - ### Method Detail

    - #### newInstance

          public static XMLOutputFactory newInstance()
                                              throws FactoryConfigurationError

      Creates a new instance of the factory in exactly the same manner as the `newFactory()` method.
      Throws:
        `FactoryConfigurationError` - if an instance of this factory cannot be loaded

    - #### newFactory

          public static XMLOutputFactory newFactory()
                                             throws FactoryConfigurationError

      Create a new instance of the factory.

      This static method creates a new factory instance. This method uses the following ordered lookup procedure to determine the XMLOutputFactory implementation class to load:

      - Use the javax.xml.stream.XMLOutputFactory system property.
      - Use the properties file "lib/stax.properties" in the JRE directory. This configuration file is in standard java.util.Properties format and contains the fully qualified name of the implementation class with the key being the system property defined above.
      - Use the service-provider loading facilities, defined by the `ServiceLoader` class, to attempt to locate and load an implementation of the service using the default loading mechanism: the service-provider loading facility will use the current thread's context class loader to attempt to load the service. If the context class loader is null, the system class loader will be used.
      - Otherwise, the system-default implementation is returned.

      Once an application has obtained a reference to a XMLOutputFactory it can use the factory to configure and obtain stream instances.

      Note that this is a new method that replaces the deprecated newInstance() method. No changes in behavior are defined by this replacement method relative to the deprecated method.

      Throws:
        `FactoryConfigurationError` - in case of service configuration error or if the implementation is not available or cannot be instantiated.

    - #### newInstance

          public static XMLInputFactory newInstance(String factoryId,
                                                    ClassLoader classLoader)
                                             throws FactoryConfigurationError

      Deprecated. This method has been deprecated because it returns an instance of XMLInputFactory, which is of the wrong class. Use the new method `newFactory(java.lang.String, java.lang.ClassLoader)` instead.
      Create a new instance of the factory.
      Parameters:
        `factoryId` - Name of the factory to find, same as a property name
        `classLoader` - classLoader to use
      Returns:
        the factory implementation
      Throws:
        `FactoryConfigurationError` - if an instance of this factory cannot be loaded

    - #### newFactory

          public static XMLOutputFactory newFactory(String factoryId,
                                                    ClassLoader classLoader)
                                             throws FactoryConfigurationError

      Create a new instance of the factory. If the classLoader argument is null, then the ContextClassLoader is used.

      This method uses the following ordered lookup procedure to determine the XMLOutputFactory implementation class to load:

      - Use the value of the system property identified by `factoryId`.
      - Use the properties file "lib/stax.properties" in the JRE directory. This configuration file is in standard java.util.Properties format and contains the fully qualified name of the implementation class with the key being the given `factoryId`.
      - If `factoryId` is "javax.xml.stream.XMLOutputFactory", use the service-provider loading facilities, defined by the `ServiceLoader` class, to attempt to locate and load an implementation of the service using the specified `ClassLoader`. If `classLoader` is null, the default loading mechanism will apply: That is, the service-provider loading facility will use the current thread's context class loader to attempt to load the service. If the context class loader is null, the system class loader will be used.
      - Otherwise, throws a `FactoryConfigurationError`.
      API Note:
        The parameter factoryId defined here is inconsistent with that of other JAXP factories where the first parameter is fully qualified factory class name that provides implementation of the factory.

        Note that this is a new method that replaces the deprecated `newInstance(String factoryId, ClassLoader classLoader)` method. The original method was incorrectly defined to return XMLInputFactory.

      Parameters:
        `factoryId` - Name of the factory to find, same as a property name
        `classLoader` - classLoader to use
      Returns:
        the factory implementation
      Throws:
        `FactoryConfigurationError` - in case of service configuration error or if the implementation is not available or cannot be instantiated.

    - #### createXMLStreamWriter

          public abstract XMLStreamWriter createXMLStreamWriter(Writer stream)
                                                         throws XMLStreamException

      Create a new XMLStreamWriter that writes to a writer
      Parameters:
        `stream` - the writer to write to
      Throws:
        `XMLStreamException`

    - #### createXMLStreamWriter

          public abstract XMLStreamWriter createXMLStreamWriter(OutputStream stream)
                                                         throws XMLStreamException

      Create a new XMLStreamWriter that writes to a stream
      Parameters:
        `stream` - the stream to write to
      Throws:
        `XMLStreamException`

    - #### createXMLStreamWriter

          public abstract XMLStreamWriter createXMLStreamWriter(OutputStream stream,
                                                                String encoding)
                                                         throws XMLStreamException

      Create a new XMLStreamWriter that writes to a stream
      Parameters:
        `stream` - the stream to write to
        `encoding` - the encoding to use
      Throws:
        `XMLStreamException`

    - #### createXMLStreamWriter

          public abstract XMLStreamWriter createXMLStreamWriter(Result result)
                                                         throws XMLStreamException

      Create a new XMLStreamWriter that writes to a JAXP result. This method is optional.
      Parameters:
        `result` - the result to write to
      Throws:
        `UnsupportedOperationException` - if this method is not supported by this XMLOutputFactory
        `XMLStreamException`

    - #### createXMLEventWriter

          public abstract XMLEventWriter createXMLEventWriter(Result result)
                                                       throws XMLStreamException

      Create a new XMLEventWriter that writes to a JAXP result. This method is optional.
      Parameters:
        `result` - the result to write to
      Throws:
        `UnsupportedOperationException` - if this method is not supported by this XMLOutputFactory
        `XMLStreamException`

    - #### createXMLEventWriter

          public abstract XMLEventWriter createXMLEventWriter(OutputStream stream)
                                                       throws XMLStreamException

      Create a new XMLEventWriter that writes to a stream
      Parameters:
        `stream` - the stream to write to
      Throws:
        `XMLStreamException`

    - #### createXMLEventWriter

          public abstract XMLEventWriter createXMLEventWriter(OutputStream stream,
                                                              String encoding)
                                                       throws XMLStreamException

      Create a new XMLEventWriter that writes to a stream
      Parameters:
        `stream` - the stream to write to
        `encoding` - the encoding to use
      Throws:
        `XMLStreamException`

    - #### createXMLEventWriter

          public abstract XMLEventWriter createXMLEventWriter(Writer stream)
                                                       throws XMLStreamException

      Create a new XMLEventWriter that writes to a writer
      Parameters:
        `stream` - the stream to write to
      Throws:
        `XMLStreamException`

    - #### setProperty

          public abstract void setProperty(String name,
                                           Object value)
                                    throws IllegalArgumentException

      Allows the user to set specific features/properties on the underlying implementation.
      Parameters:
        `name` - The name of the property
        `value` - The value of the property
      Throws:
        `IllegalArgumentException` - if the property is not supported

    - #### getProperty

          public abstract Object getProperty(String name)
                                      throws IllegalArgumentException

      Get a feature/property on the underlying implementation
      Parameters:
        `name` - The name of the property
      Returns:
        The value of the property
      Throws:
        `IllegalArgumentException` - if the property is not supported

    - #### isPropertySupported

          public abstract boolean isPropertySupported(String name)

      Query the set of properties that this factory supports.
      Parameters:
        `name` - The name of the property (may not be null)
      Returns:
        true if the property is supported and false otherwise

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