Write output of a java program fired from Powershell to standard output

Question

I have a powershell script that is calling a jar via the following code:

Start-Process java -ArgumentList '-jar', "$jarPath", "$csvPath"

However, the output from the jar is not coming through. I'm pretty sure its running successfully, but I'd like to be sure. How can I pass it through to the Powershell console?

Start-Process should do that by default. What does the Java code look like that supposedly generates output? — Ansgar Wiechers
– Ansgar Wiechers, Commented Aug 20, 2016 at 0:44
Maybe this helps? stackoverflow.com/questions/8761888/… Worked for me when I had a similar problem — whatever
– whatever, Commented Aug 20, 2016 at 11:25
@AnsgarWiechers I'm still not seeing anything being written using Start-Process, but I tried just running the java -jar "$jarPath" "$csvPath" straight and I'm now getting output to the console. — chazbot7
– chazbot7, Commented Aug 22, 2016 at 18:47
@whatever thank you, but I was looking to get the output as it was being generated, not once at the end. — chazbot7
– chazbot7, Commented Aug 22, 2016 at 18:48
Try running Start-Process with the parameter -NoNewWindow. Or simply use the call operator (see below). — Ansgar Wiechers
– Ansgar Wiechers, Commented Aug 22, 2016 at 19:31

Ansgar Wiechers · Accepted Answer · 2016-08-20 00:41:19Z

3

Replace Start-Process with the call operator:

& java -jar $jarPath $csvPath

answered Aug 20, 2016 at 0:41

Ansgar Wiechers

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PatrykMilewski · Accepted Answer · 2016-08-20 16:43:12Z

1

This works fine for me:

$stdout = "C:\temp\stdout.txt"
Start-Process powershell -ArgumentList "echo 123" -RedirectStandardOutput $stdout -Wait
$output = Get-Content $stdout
echo $output
Remove-Item $stdout

Since I started Powershell process with command echo 123, it returned 123to stdout, so this value is saved to file. Swap Powershell with Java and it should be working as you expect. Remember, that you cannot redirect stdout directly to variable, you must do it via file.

answered Aug 20, 2016 at 16:43

PatrykMilewski

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chazbot7 Over a year ago

I'm looking to hopefully have the output to be written as its generated, rather than once at the end. If that's not possible then this will definitely do the trick!

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