Update to XStream 1.4.6 needed, because of JENKINS-19031.
Users with IBM-JAVA cannot update Jenkins with versions higher 1.503
ArrayIndexOutOfBoundsException during Jenkins.doConfigSubmit; need XStream 1.4.6
com.thoughtworks.xstream.converters.ConversionException: Array index out of range: -1 : Array index out of range: -1
XStream deserialization errors at service startup
Jenkins crash on oracle java 8
Pull request added at https://github.com/jenkinsci/xstream/pulls
Should be fixed in 1.557 and 1.554.1 with upgrade to Xstream 1.4.7-jenkins-1.