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#6 Support META-INF/services for XMLReader


Currently, JAXP checks four places to find the default
(non-SAX) parser class:

* system property (SAX does too) if possible
--> per-JVM-instance defaulting
* $(JAVA_HOME)/jre/lib/jaxp.properties
--> installation-wide defaulting
* META-INF/services/... resource
(usually in jarfile)
* compiled-in default (this proposal adds to SAX)

Currently, XMLReaderFactory supports the use of a
system property. A separate proposal has been
suggested to provide a compiled-in default, as well.

I'd like to see XMLReaderFactory also support the META-
INF/services mechanism for a default XMLReader
implementation so that a default implementation may be
bundled with a library or application distribution as
a resource. This should work in concert with the other
mechanisms similarly to JAXP. A system property -- if
set -- should take precedence. If not set, then
XMLReaderFactory should attempt to load the
resource /META-INF/services/org.xml.sax.XMLReader to
read in a list of appropriate implementation classes
and if present, attempt instantiation of an instance
of one of the listed classes. If this resource is not
present (or XMLReaderFactory is unable to instantiate
any of the listed classes), then it should fall back
to a compiled-in default.


  • David Brownell
    David Brownell

    • status: open --> closed-fixed