Using Maven Exec Plugin inside Bash

Question

I'm writing a bash script which will execute some part of a maven project. The script looks like this:

CMD="mvn exec:java -Dexec.mainClass=$MAINCLASS -Dexec.args=\"cfg.txt TRAIN\""  
echo "Running $CMD..."

$CMD

But this fails every time with the following error:

[ERROR] Unknown lifecycle phase "TRAIN". You must specify a valid 
lifecycle phase...

If I skip the CMD=... assignment, and just run the mvn part directly, like this...

mvn exec:java -Dexec.mainClass=$MAINCLASS -Dexec.args="cfg.txt TRAIN"

...it works just fine.

How can I get maven and the exec plugin to understand that I have two arguments in the -Dexec.args section?

Peter Svensson · Accepted Answer · 2014-06-05 18:31:41Z

1

According to the docs exec:java has no exec.args? It does have exec.arguments which takes a String[] which would translate into:

CMD="mvn exec:java -Dexec.mainClass=$MAINCLASS -Dexec.arguments=\"cfg.txt\",\"TRAIN\""

answered Jun 5, 2014 at 18:31

Peter Svensson

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2 Comments

mayhewsw Over a year ago

This is the right idea. I just edited your answer to remove quotes around the strings in exec.arguments. Apparently it takes the quotes literally?

mayhewsw Over a year ago

Actually, exec:java does have exec.args, and it is not all clear what the difference between exec.arguments and exec.args is.

Neil Greenwood · Accepted Answer · 2015-01-07 08:46:10Z

1

I've just found that this problem might also be solved by putting quotes around the whole -Dexec.args value, like so:

CMD="mvn exec:java -Dexec.mainClass=$MAINCLASS \"-Dexec.args=cfg.txt TRAIN\""

answered Jan 7, 2015 at 8:46

Neil Greenwood

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Comments

user3458 · Accepted Answer · 2014-06-05 18:36:54Z

0

This is really a bash quoting issue, not Maven issue as such.

To debug it do

echo $CMD

and then cut and paste the result into your command line. Tinker with quotation till it works

Try

CMD="mvn exec:java -Dexec.mainClass=$MAINCLASS -Dexec.args='cfg.txt TRAIN'"

for starters

answered Jun 5, 2014 at 18:36

user3458

Comments

wytten · Accepted Answer · 2021-10-01 17:42:25Z

0

Riffing on @Peter Svensson's answer, I suggest:

-Dexec.arguments=$(echo $@ | tr ' ' ',')

Where $@ is the standard bash symbol for arguments provided to the bash script, and the tr command is changing the list from space-delimited to comma-delimited

answered Oct 1, 2021 at 17:42

wytten

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