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How to Detect a File not Found

 
Steve Dyke
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My following code displays the PDF sent to it but I need to know how to make it work when there is no PDF file found. The code as it is now generates an error:

SRVE0068E: Could not invoke the service() method on servlet /NoPDFfileExists.jsp. Exception thrown : java.lang.IllegalStateException: SRVE0199E: OutputStream already obtained

 
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