Hi All, I’m new to kotlin and facing 1 issue while using a config property for boolean in my class. ...

# getting-started

[Raghu Nittala]

Hi All, I’m new to kotlin and facing 1 issue while using a config property for boolean in my class. I couldnt pass it as a constructor argument as there are already 6 parameters and detekt wont allow me to do so:

@ConfigProperty(name = "event-enabled")
lateinit var eventEnabled: Boolean

For all the other types like String I’m able to do it. But for Boolean it fails with the error “‘lateinit’ modifier is not allowed on properties of primitive types”. I tried by removing lateinit, and it is giving me initialization errors. Can someone please help me on this?

[ephemient]

lateinit doesn't work for primitives or nullables. it's basically a nullable field under the covers, with a null check on every read. you can replace it with

var eventEnabled: Boolean = false

if you don't need to be guarded against read-before-initialization,

[ephemient]

var eventEnabled: Boolean by Delegates.notNull()

if you do, or

[ephemient]

var eventEnabled: Boolean? = null

with a eventEnabled!! check on read, for less overhead than delegates

[Raghu Nittala]

I tried both

var eventEnabled: Boolean = false and
var eventEnabled: Boolean? = null

the error says Injected field should not be initialized

[ephemient]

ah it's magic framework stuff… don't think you have a way around that

[Raghu Nittala]

yeah using this inside @ApplicationScoped class

[Klitos Kyriacou]

Is this a data class? If so, I think Detekt has a setting to ignore long parameter lists in data classes.

[Michael Krussel]

Or you can just suppress it for this case where you know it is not recommended but it is better than alternatives. Making something mutable and lateinit to just shrink the size of a constructor arg list is wrong.

The goal of the warning is to reduce what the class is doing or try to group properties together into their own class.

[Klitos Kyriacou]

There are ways a long list of properties can be reduced. For example, if you have many Boolean properties, they can often be grouped into a single property val flags: EnumSet<FooBarOptions>

[Raghu Nittala]

Yeah, I can change the setting in detekt yml, but before I do that wanted to check if some alternative is possible

[Raghu Nittala]

Its not a data class, its a regular class

[ephemient]

if constructor is an option, I'd just suppress on that class

[ephemient]

constructor injection is better than lateinit, enough to override the parameter count guidance, IMO.

[Raghu Nittala]

Yeah, seems thats the easy and better way

[Raghu Nittala]

thanks all