TMF628: InvalidPayloadException

At MeasurementCollectionJobApiRouteBuilder.java

    from(PM_MEASUREMENT_COLLECTION_JOB_GET_INPRORGESS_OR_PENDING)
            ....
            .convertBodyTo( String.class );
}

The body is an ArrayList, and convertBodyTo( String.class ) creates this error

A LazyInitializationException caused by attempting to access a lazily loaded Hibernate collection (fileTransferData) outside of an active Hibernate session