Trouble with importing Java output into shell script

Question

Any help is appreciated:

I am running a simple java currency converter application and trying to test it using conditional bash statements. For this test I am seeking to test when the user doesn't enter any value into the application what the resulting output is. Here is the bash script:


#!/bin/bash

input=""

expectedOuput="Please enter correct input"

actualOutput=$(java CurrencyConverter $input)

if [ $expectedOutput == $actualOutput ]; then
echo "Test 1 Passed"
else
echo "Test 1 Failed"
fi

I am aiming for the test to fail and echo this, however the script just returns the java error instead of echoing, like this:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
    at CurrencyConverter.main(CurrencyConverter.java:12)

I am newer to bash scripting so have been changing the syntax, I just cant seem to stop the java error being printed

Diego Torres Milano · Accepted Answer · 2022-11-10 23:02:15Z

1

The exception message is printed to stderr, so if you want to get it in actualOutput (perhaps misleading name now):

actualOutput=$(java CurrencyConverter "$input" 2>&1)

you can also check the exit status of the java command.

Also check misspelled expectedOuput and use of quotes. Use https://www.shellcheck.net/.

And the ArrayIndexOutOfBoundsException it's definitely something you should fix in your java code.

answered Nov 10, 2022 at 23:02

Diego Torres Milano

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3 Comments

Ewando Over a year ago

Diego, I appreciate you're help greatly, thank you! After reading your comment, I have changed my script to this: `` #!/bin/bash input="" expectedOutput="Please enter correct input" actualOutput=$(java CurrencyConverter "$input" 2>&1) if [ $expectedOutput == $actualOutput ]; then echo "Test 1 Passed" else echo "Test 1 Failed" fi `` I am glad that the java error is no longer printing, however there is still an error: test1.sh: 9: [: Please: unexpected operator I am confused as "==" should compare strings, unless I am looking in the wrong area? Thanks, Ewan

Ewando Over a year ago

Sorry, for the poor formatting in my last comment. I tried with one equal operand and this seems to work, perhaps I am confusing syntax! Thanks for your help Diego and have a nice weekend :)

Diego Torres Milano Over a year ago

I guess ` if [[ "$expectedOutput" == "$actualOutput" ]]; then...`

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