Error model fails to load with Java 1.7

[INFO] Reading error model 76 bases model
[ERROR] Unable to load error model : Cannot construct
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions as it
does not have a no-args constructor
---- Debugging information ----
message             : Cannot construct
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions as it
does not have a no-args constructor
cause-exception     :
com.thoughtworks.xstream.converters.reflection.ObjectAccessException
cause-message       : Cannot construct
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions as it
does not have a no-args constructor
class               :
fbi.genome.sequencing.rnaseq.simulation.error.QualityErrorModel
required-type       :
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions
path                :
/fbi.genome.sequencing.rnaseq.simulation.error.QualityErrorModel/qualityModel
line number         : 2
-------------------------------
com.thoughtworks.xstream.converters.ConversionException: Cannot
construct fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions
as it does not have a no-args constructor
---- Debugging information ----
message             : Cannot construct
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions as it
does not have a no-args constructor
cause-exception     :
com.thoughtworks.xstream.converters.reflection.ObjectAccessException
cause-message       : Cannot construct
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions as it
does not have a no-args constructor
class               :
fbi.genome.sequencing.rnaseq.simulation.error.QualityErrorModel
required-type       :
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions
path                :
/fbi.genome.sequencing.rnaseq.simulation.error.QualityErrorModel/qualityModel
line number         : 2
-------------------------------
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:63)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:45)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:46)
at com.thoughtworks.xstream.annotations.AnnotationReflectionConverter.unmarshallField(AnnotationReflectionConverter.java:66)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:188)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:125)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:56)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:45)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:46)
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:117)
at com.thoughtworks.xstream.core.ReferenceByXPathMarshallingStrategy.unmarshal(ReferenceByXPathMarshallingStrategy.java:29)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:846)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:833)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:789)
at fbi.genome.sequencing.rnaseq.simulation.error.MarkovErrorModel.loadErrorModel(MarkovErrorModel.java:325)
at fbi.genome.sequencing.rnaseq.simulation.Sequencer.loadErrors(Sequencer.java:216)
at fbi.genome.sequencing.rnaseq.simulation.SimulationPipeline.call(SimulationPipeline.java:306)
at fbi.genome.sequencing.rnaseq.simulation.SimulationPipeline.call(SimulationPipeline.java:32)
at fbi.commons.flux.Flux.main(Flux.java:182)
Caused by: com.thoughtworks.xstream.converters.reflection.ObjectAccessException:
Cannot construct
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions as it
does not have a no-args constructor
at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.newInstance(PureJavaReflectionProvider.java:59)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.instantiateNewInstance(AbstractReflectionConverter.java:257)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:124)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:56)
... 18 more
[ERROR] Unable to load error model : Cannot construct
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions as it
does not have a no-args constructor
---- Debugging information ----
message             : Cannot construct
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions as it
does not have a no-args constructor
cause-exception     :
com.thoughtworks.xstream.converters.reflection.ObjectAccessException
cause-message       : Cannot construct
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions as it
does not have a no-args constructor
class               :
fbi.genome.sequencing.rnaseq.simulation.error.QualityErrorModel
required-type       :
fbi.genome.sequencing.rnaseq.simulation.error.QualityTransitions
path                :
/fbi.genome.sequencing.rnaseq.simulation.error.QualityErrorModel/qualityModel
line number         : 2
-------------------------------