How to generate string by joining ArrayList of Strings in spel?

Question

I want to form a new string from ArrayList of Strings with a particular delimiter using spel.

list = ["a", "b", "c"]

I want to make a String s = "a,b,c" from above list.

I tried many expressions such as StringUtils.join(list, ','), list.stream().collect(Collectors.joining(',')), etc. but every time I'm getting an error

EL1008E: Property or field 'StringUtils' cannot be found on object of type 'java.util.LinkedHashMap' - maybe not public or not valid?

Is there any way to do this in spel?

Gary Russell · Accepted Answer · 2022-03-15 13:18:19Z

0

If StringUtils.join is a static method, you need T(com.my.StringUtils).join(...) (need full class name too).

answered Mar 15, 2022 at 13:18

Gary Russell

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Null Void · Accepted Answer · 2024-03-02 03:14:03Z

0

I think I found an answer, or at least, worked for me in spinnaker's SpEL:

${ T(String).join(',', "a", "b" ,"c" )  }
"a,b,c"

and even better, for my particular use case, to get rid of nasty nulls:

${ T(String).join(',', ({"a", null ,"c"}.?[#this != null]) ) }
"a,c"

and it even worked for:

${ T(String).join(' / ', someList )}
${ T(String).join(' / ', someSimpleMap.values() )}

(by "simple map", I mean, single depth, set of A: B, no nested or otherwise complex maps. Left that adventure to the reader :)

answered Mar 2, 2024 at 3:14

Null Void

1

Comments

Elikill58 · Accepted Answer · 2022-03-14 00:19:29Z

-2

You can use this instead

String lst[] = new String[]{"a","b","c"};
System.out.println(String.join(",",lst)); //here output will be a,b,c

edited Mar 14, 2022 at 0:19

Elikill58

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answered Mar 13, 2022 at 18:47

Rohith reddy

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1 Comment

fbastien Over a year ago

Sorry but OP was asking for a solution in SpEL (Spring Expression Language), not in plain Java

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