As explained in commit a247b83cd9, the
XppDriver from XStream relies on the XPP3 library which publishes
javax.xml.namespace.QName as part of its JAR. The QName type is also
published by the java.xml system module in modular JREs (i.e., Java 9
or higher).
This results in a split package between the unnamed module and the
java.xml system module, which the Java Language Specification defines
as illegal (see §6.5.5.2 and §7.4.3).
Most Java compilers do not currently enforce this rule; however, the
Eclipse compiler does. This makes it impossible to use spring-oxm out
of the box in the Eclipse IDE. In addition, if bug JDK-8215739 is fixed
in future versions of other JDK implementations, this rule will affect
any users using spring-oxm with those JDKs.
This commit therefore switches the default driver in XStreamMarshaller
from XppDriver to DomDriver. Users can naturally switch back to the
XppDriver if they wish, since the driver is configurable.
Closes gh-27464
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