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java.lang.NullPointerException: 	at java.lang.Class.isAssignableFrom(Native Method)	at com.thoughtworks.xstream.converters.reflection.ExternalizableConverter.canConvert(ExternalizableConverter.java:73)	at com.thoughtworks.xstream.core.DefaultConverterLookup.registerConverter(DefaultConverterLookup.java:74)	at com.thoughtworks.xstream.XStream$2.registerConverter(XStream.java:502)