Christoph Jaehnigen schrieb:
Hi, I need some advice with the Commons Configuration library.
I use a XML file for configuration storage which has a DTD specified
being reachable by a HTTP URI. I need to use a HTTP proxy on the
executing machine.
When I try to load the XML configuration, also with setValidate() to
false I get a ConfigurationException with the message: Unable to load
the configuration. When removing the DTD statement the configuration
loads just fine.
So: is Apache commons-configuration HTTP proxy aware? Does it use the
actual JVM settings? I also tried to use the -Dhttp.proxyHost system
properties settings with no success.
So, how to do it? Btw. machine is WinXP and I'm using Eclipse as IDE
with m2eclipse for Maven support.
Thx
Chris
Hm, good question.
XMLConfiguration does not load the DTD on its own, but relies on the XML
parser used. The parser itself is obtained using a default
DocumentBuilderFactory. I would expect that the XML parser understands
the proxy-related system variables and uses them if they are set. (Note
that the DTD has to be loaded in any case, even if validation is
disabled, because it might contain entity definitions that have to be
resolved.)
For performance reasons it would be better not to load the DTD from a
HTTP server, but ship a local copy with your application. You can put it
somewhere on the class path. You can then use the method
registerEntityId() of XMLConfiguration to map the public ID of the DTD
to a local resource. That way no network access is required.
Oliver
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