I want to read what gets written to stdout in a Java process that spawns other processes using inheritIO. I cannot use redirectOut as I have no control over the code that starts the process!. Also note that resetting System.setOut doesn't work in this case. Also I don't have access to the Process object.
Example:
new ProcessBuilder().command('/bin/echo', 'FooBar').inheritIO.start
// read 'FooBar' from standard out
By definition, inheritIO causes the output of subprocess to be the same of the output of caller. So as soon as you call it on the ProcessBuilder, the calling process cannot read the standard output nor error streams of the callee.
As you say you cannot change that, the only way I can imagine is to use an external launcher that redirects output to a pipe (the default for ProcessBuilder...), starts the program containing the line you showed (new ProcessBuilder().command('/bin/echo', 'FooBar').inheritIO.start) and processes that output.
