RFR [JDK8]: 7169894: JAXP Plugability Layer: using service loader

Alan Bateman Alan.Bateman at oracle.com
Thu Jun 21 21:00:24 UTC 2012

On 21/06/2012 19:02, Joe Wang wrote:
> :
> For the class loader, as discussed with Paul, since the ServiceLoader 
> does so much, we may be able to skip the 'using different classloader' 
> part, that is, simply calling load without classloader.  The javadoc 
> states that it's equivalent to load with context class loader.  But 
> from what I can, it found all that's placed in the endorsed dir or 
> bootclasspath.  I need to do a few more tests on this.
It doesn't seem to be specified but the implementation (in at least some 
places) appears to use the TCCL or the defining loader of the 
FactoryFinder class (the bootstrap class loader in the case of the JDK). 
Using the single-argument ServiceLoader.load is probably want you want now.

> :
> Maybe I'm a little confused.  But the fallback to default 
> implementation is in the spec.  It happens the jaxp ri is installed as 
> an endorsed technology here and loaded by the ServiceLoader.
Yes, but ultimately we have to get to the point where we can scale down 
the platform so you may have an embedded device, for example, that 
doesn't validating parsers or a XPathFactory installed for example. So I 
think this wording will need to get adjusted in time to allow for the 
appropriate *ConfigurationException to be thrown then there isn't any 
service provider module installed.


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