Hi all,
I'm trying to run a shell script from a Java program. I finally got a trivial
example working wtih ProcessBuilder, and learned that I had to be sure to
capture the child process's output so that my program would work correctly. I
have also seen the warning in the Sun documentation which states, "It is
possible that the examples will deadlock if the subprocess generates enough
output to overflow the system. A more robust solution requires draining the
process stdout and stder in separate threads." That got me looking for
information on draining these streams, and also led me to find Apache commons
exec.
My ultimate goal is to have the following.
a. Java program calls shell script when user pushes a button.
b. Shell script executes a sql script. This script produces several output
files, some of which can be large.
c. Shell script then calls a java program which uses Apache Commons Net to FTP
the files to an FTP server.
I have already successfully tested parts b and c, so now I'm trying to add part
a (Java calls shell script). My problem is that I'm having a hard time finding
examples of how to drain the stdout/stderr for large amounts of data. I have
looked at the documentation, but don't have much experience with dealing with
either streams or threads. Can you please point me in the right direction?
Thanks.
