8000354: (props) Properties.storeToXML/loadFromXML need to allow for alternative implementations
Alan.Bateman at oracle.com
Fri Oct 5 13:41:14 UTC 2012
Properties defines the loadFromXML and storeToXML methods for
loading/storing properties in XML format. These methods are problematic
for our efforts to modularize the JDK because of the dependency on XML.
They are also problematic for the Compact Profiles proposal  as it is
unlikely that JAXP will be present in the smallest profile.
As the XML parsing needs of Properties is relatively simple we are
thinking about including a small footprint parser that is sufficient for
its needs. Joe Wang is looking this. In preparation for this we need to
decouple Properties from the parser API that it uses and this is what
the proposal here is about.
The webrev with the proposed changes is here:
Basically it introduces a JDK internal provider interface to which the
loadFromXML and storeToXML methods delegate. The existing code that uses
JAXP is moved into a provider implementation and will be used when
present. When not present then the intention is that it will fallback to
a default implementation that is the small footprint provider that Joe
will add later. This approach ensures that we maintain compatibility (it
remains to be seen whether we will have to deal with a few subtle issues
when using the tiny parser). For test purposes there is a system
property for overriding the provider, this is also why the system class
loader is used as the initiating loader.
I should explain that when I say "JDK internal provider interface" then
the service type is in sun.util.spi for now. Maybe in the future it may
be necessary to define a standard provider interface but it is not
needed at this time (in addition it would require getting the security
right to do that).
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