If you specify a file that is not found (test file, schema file, etc.), you get the "An unexpected exception occurred" message. I'm assuming we want the code to actually handle this exception and provide the use with a simple message stating which file was not found, with no error trace.

My output:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!! An unexpected exception occurred. This is a bug! !!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Please help us fix this by opening a bug report at:

https://opensource.ncsa.illinois.edu/jira/browse/DFDL

Please include the following exception, the command you
ran, and any input, schema, or tdml files used that led
to this bug.

java.io.FileNotFoundException: daffodil-perf/dns.cap (No such file or directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.io.FileInputStream.<init>(FileInputStream.java:97)
at edu.illinois.ncsa.daffodil.Main$.run(Main.scala:328)
at edu.illinois.ncsa.daffodil.Main$.main(Main.scala:514)
at edu.illinois.ncsa.daffodil.Main.main(Main.scala)

the command I used:

./daffodil-core/target/start parse -s daffodil-perf/src/test/resources/edu/illinois/ncsa/daffodil/pcap/pcap.dfdl.xsd daffodil-perf/dns.cap