Comment 3 for bug 779908

1) Yes, I have tried with different files, in particular: one generated by gnuplot, one from the internet, and one hand-written according to the examples in the PDf specifications

2) dump_data works, with and without output, and even when there is no "info dictionary" as in the case for the hand-written file.

FWIW, I ran `pdftk poppler-data.pdf output /tmp/a.pdf verbose` and got the following (not sure if it helps):
Command Line Data is valid.

Input PDF Filenames & Passwords in Order
( <filename>[, <password>] )
   poppler-data.pdf

The operation to be performed:
   filter - Apply 'filters' to a single, input PDF based on output args.
      (When the operation is omitted, this is the default.)

The output file will be named:
   /tmp/a.pdf

Output PDF encryption settings:
   Output PDF will not be encrypted.

No compression or uncompression being performed on output.

Creating Output ...
Unhandled Java Exception:
Unhandled Java Exception:
java.lang.NullPointerException
   at gnu.gcj.runtime.NameFinder.lookup(libgcj.so.11)
   at java.lang.VMThrowable.getStackTrace(libgcj.so.11)
   at java.lang.Throwable.getStackTrace(libgcj.so.11)
   at java.lang.Throwable.stackTraceString(libgcj.so.11)
   at java.lang.Throwable.printStackTrace(libgcj.so.11)
   at java.lang.Throwable.printStackTrace(libgcj.so.11)