A wellscreen assembly has first and second screen joints connected together and has at least first and second adjoining tubes with opposed ends separated by a gap from one another. At least one jumper tube has first and second tubulars and fits in the gap between the adjoining tubes. The first tubular has a first end connectable to one of the opposed ends, while the second tubular has a second end connectable to another of the opposed ends. The second tubular is telescopically connected to the first tubular, and a biasing element biases the first and second tubulars away from one another. The first and second tubulars are operable between (i) a retracted condition retracting the first and second ends from the opposed ends and (ii) an extended condition extending the first and second ends to the opposed ends of the adjoining tubes.