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How to resolve pgrouting dijkstra_sp() function error?

insert into dijsktra_results(geom) select ST_UNION(the_geom) from dijkstra_sp('roads_layer', (select source_id from roads_layer where gid=9975)::integer, (select target_id from ...
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dijkstra_sp runs without error in postgres query terminal, but triggers an error in Java

I am running this simple query select id,gid from dijkstra_sp('roads',22,33) This works perfectly fine and returns results in postgres query terminal. However running exactly the same query in java ...