Package xstream appears to be using Java generics, but generates class files in format older than 49.0, which corresponds to J2SE 5.0, in which generics were introduced. Please update this package to generate classes in format 49.0 or above. This corresponds to -target 1.5 option of javac (or ecj). For more information, see bug #842394
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
The build does use -target 1.5 for the portions of the library that require it, and it uses -target 1.3 for the portions that do not. It looks to me like this should be okay.
This bug was reported in automated way, with quite high ratio of false positives. I'm closing it now since xstream seems to be unaffected. Thank you for investingaing it.