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WebApplicationException thrown when trying to stream download file

 
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I am accessing a URL that downloads an xls file. I had code that saved it first, then streamed it to the user via Desktop.getDesktop().open(file);

However, I now would prefer to do it in the one step, access the file and stream it straight to the user. I have updated my code but everytime it downloads the file, I get this output:
WARN o.a.c.j.i.WebApplicationExceptionMapper - WebApplicationException has been caught : no cause is available

This is my code:
 
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