CODEWITHSUNDEEP
springkotlinspring-el
Nussbam
Nussbam

Reputation: 31

How to use a kotlin constant in spring spel expression

I try to create a KafkaListener in Kotlin with

@KafkaListener(topics = "<TOPIC_NAME>")

For I want to use a kotlin constant

I tried to access it with:

@KafkaListener(topics = "\${T(package.name.Class).CONST}")

kotlin class:

package package.name

class Class{
  companion object{
    const val CONST = "desired-topic-name"
  }
}

I'm getting a "Could not resolve placeholder" error message but would expect to use the constant

Upvotes: 0

Views: 1379

Answers (2)

Nussbam
Nussbam

Reputation: 31

I was thinking way too far:

In the end I just used 

@KafkaListener(topics = "${package.name.Class.CONST}"

and it works like a charm

Upvotes: 1

Gary Russell
Gary Russell

Reputation: 174729

You need to use # instead of $. $ is a simple property placeholder.

Upvotes: 1

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