The version of spring-batch-core shipped with Fuse 6.1.x (2.2.2.RELEASE) declares dependencies of this form on XStream:

com.thoughtworks.xstream.io;resolution:=optional;version="[1.3,1.4)"

The version of XStream that is supplied with Fuse

Apache ServiceMix :: Bundles :: xstream (1.4.8.1)

exposes xstream packages with version 1.4.8:

com.thoughtworks.xstream.io;
uses:="com.thoughtworks.xstream.io.naming,
com.thoughtworks.xstream.core.util,
com.thoughtworks.xstream.converters,
com.thoughtworks.xstream";
version=1.4.8,

The spring-batch-core module will therefore not wire to XStream, and applications fail at runtime with a bunch of NoClassDefFoundExceptions. This problem is not noticed at installation time, because the XStream dependency is marked as optional.