Skip to main content

Replace Kotlin property assignment with setter call

io.moderne.java.spring.kotlin.ReplaceKotlinPropertyAssignmentWithSetterCall

Rewrites a Kotlin property-style assignment (obj.prop = value) to an explicit setter invocation (obj.setProp(value)). Use when a Java library adopts JSpecify @NullMarked and a previously-var synthetic property is demoted to val: Kotlin requires the getter's return type and the setter's parameter type to share the same nullability, and once they diverge the assignment stops compiling.

Recipe source​

This recipe is only available to users of Moderne.

This recipe is available under the Moderne Proprietary License.

Options​

TypeNameDescriptionExample
StringmethodPatternA MethodMatcher pattern identifying the Java setter to convert to. Kotlin property assignments whose resolved setter matches this pattern will be rewritten to an explicit set...(value) call.org.springframework.boot.web.servlet.AbstractFilterRegistrationBean setFilter(..)
StringpropertyNameThe Kotlin synthetic-property name corresponding to the setter (e.g. filter for setFilter, URL for setURL, isEnabled for setEnabled paired with isEnabled()). Kotlin's naming rules preserve acronyms and the is prefix on boolean properties, so the property name is stated explicitly rather than derived.filter

Used by​

This recipe is used as part of the following composite recipes:

Example​

Parameters​
ParameterValue
methodPatternFILTER_REG_BEAN_SET_FILTER
propertyNamefilter
Before​
import jakarta.servlet.Filter
import org.springframework.boot.web.servlet.FilterRegistrationBean

class Config {
    fun requestResponseFilterRegistration(requestResponseFilter: Filter): FilterRegistrationBean<Filter> {
        val registration = FilterRegistrationBean<Filter>()
        registration.filter = requestResponseFilter
        return registration
    }
}
After​
import jakarta.servlet.Filter
import org.springframework.boot.web.servlet.FilterRegistrationBean

class Config {
    fun requestResponseFilterRegistration(requestResponseFilter: Filter): FilterRegistrationBean<Filter> {
        val registration = FilterRegistrationBean<Filter>()
        registration.setFilter(requestResponseFilter)
        return registration
    }
}

Usage​

This recipe has required configuration parameters and can only be run by users of Moderne. To run this recipe, you will need to provide the Moderne CLI run command with the required options. Or, if you'd like to create a declarative recipe, please see the below example of a rewrite.yml file:

rewrite.yml
---
type: specs.openrewrite.org/v1beta/recipe
name: com.yourorg.ReplaceKotlinPropertyAssignmentWithSetterCallExample
displayName: Replace Kotlin property assignment with setter call example
recipeList:
  - io.moderne.java.spring.kotlin.ReplaceKotlinPropertyAssignmentWithSetterCall:
      methodPattern: org.springframework.boot.web.servlet.AbstractFilterRegistrationBean setFilter(..)
      propertyName: filter

You will need to have configured the Moderne CLI on your machine before you can run the following command.

shell
mod run . --recipe ReplaceKotlinPropertyAssignmentWithSetterCall --recipe-option "methodPattern=org.springframework.boot.web.servlet.AbstractFilterRegistrationBean setFilter(..)" --recipe-option "propertyName=filter"

If the recipe is not available locally, then you can install it using:

mod config recipes jar install io.moderne.recipe:rewrite-spring:0.34.0

See how this recipe works across multiple open-source repositories​

Run this recipe on OSS repos at scale with the Moderne SaaS.

The community edition of the Moderne platform enables you to easily run recipes across thousands of open-source repositories.

Please contact Moderne for more information about safely running the recipes on your own codebase in a private SaaS.

Data Tables​

Source files that had results​

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column NameDescription
Source path before the runThe source path of the file before the run. null when a source file was created during the run.
Source path after the runA recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Parent of the recipe that made changesIn a hierarchical recipe, the parent of the recipe that made a change. Empty if this is the root of a hierarchy or if the recipe is not hierarchical at all.
Recipe that made changesThe specific recipe that made a change.
Estimated time savingAn estimated effort that a developer to fix manually instead of using this recipe, in unit of seconds.
CycleThe recipe cycle in which the change was made.