How to create Java array in Kotlin for @PropertySource?

Question

I am trying to configure @PropertySource for my Spring-based application.

In Java, I could do something like this:

@PropertySource(value = {"application.properties","other.properties" })

I tried arrayOf in Kotlin but I end up with a type mismatch:

@PropertySource(value = arrayOf("application.properties", "other.properties"))

What is the right way to go here?

yole · Accepted Answer · 2017-03-14 08:32:50Z

9

The value annotation parameter is handled in a special way in Kotlin (following its special handling in Java), and if it has an array type, Kotlin converts it to a vararg. Therefore, the correct syntax here is simply:

@PropertySource("application.properties", "other.properties")

If you do want to specify the parameter name explicitly, use the spread operator to expand the array into varargs:

@PropertySource(value = *arrayOf("application.properties", "other.properties"))

For any other array annotation parameter, you should simply use arrayOf() normally.

answered Mar 14, 2017 at 8:32

yole

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jeremyt · Accepted Answer · 2020-01-27 10:33:09Z

3

Adding this in case it helps anyone...

I needed multiple instances of the same annotation, but I also needed to set other attributes of the annotation.

@Configuration
@PropertySources(
        PropertySource(
                value = ["classpath:consul.properties"]),
        PropertySource(
                value = ["file:/run/example/consul.properties"],
                ignoreResourceNotFound = true)
)

answered Jan 27, 2020 at 10:33

jeremyt

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