Attempt to create an XMLReader from system defaults.

  Attempt to create an XMLReader from system defaults. In environments which can support it, the name of the XMLReader class is determined by trying each these options in order, and using the first one which succeeds:

• If the system property org.xml.sax.driver has a value, that is used as an XMLReader class name.
• The JAR "Services API" is used to look for a class name in the META-INF/services/org.xml.sax.driver file in jarfiles available to the runtime.
• SAX parser distributions are strongly encouraged to provide a default XMLReader class name that will take effect only when previous options (on this list) are not successful.
• Finally, if ParserFactory.makeParser() can return a system default SAX1 parser, that parser is wrapped in a ParserAdapter. (This is a migration aid for SAX1 environments, where the org.xml.sax.parser system property will often be usable.)

In environments such as small embedded systems, which can not support that flexibility, other mechanisms to determine the default may be used.

Note that many Java environments allow system properties to be initialized on a command line. This means that in most cases setting a good value for that property ensures that calls to this method will succeed, except when security policies intervene. This will also maximize application portability to older SAX environments, with less robust implementations of this method.

Returns: A new XMLReader.
Throws:
- org.xml.sax.SAXException - If no default XMLReader class can be identified and instantiated.
See Also: XMLReaderFactory.createXMLReader(java.lang.String),

  Attempt to create an XML reader from a class name.

  Attempt to create an XML reader from a class name.

Given a class name, this method attempts to load and instantiate the class as an XML reader.

Note that this method will not be usable in environments where the caller (perhaps an applet) is not permitted to load classes dynamically.

Returns: A new XML reader.
Throws:
- org.xml.sax.SAXException - If the class cannot be loaded, instantiated, and cast to XMLReader.
See Also: XMLReaderFactory.createXMLReader(),