java.lang.NullPointerException: This exception has no message.

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at com.thoughtworks.xstream.converters.reflection.FieldDictionary.buildMap(
at com.thoughtworks.xstream.converters.reflection.FieldDictionary.fieldOrNull(
at com.thoughtworks.xstream.converters.reflection.FieldDictionary.field(
at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.getField(
at com.thoughtworks.xstream.mapper.AttributeMapper.addAttributeFor(
at com.thoughtworks.xstream.XStream.useAttributeFor(
at com.thoughtworks.xstream.XStream.aliasAttribute(
at myproject.XstreamSerializer.(

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