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Replace Kotlin property assignment with setter call

Recipe IDio.moderne.java.spring.kotlin.ReplaceKotlinPropertyAssignmentWithSetterCall

Artifactio.moderne.recipe:rewrite-spring

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.

Single recipeOpenRewriteModerne Proprietary License

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Options

2 parameters

2 required

Parameter	Example	Type	Required
methodPattern	org.springframework.boot.web.servlet.AbstractFilterRegistrationBean setFilter(..)	String	Required
A 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.
propertyName	filter	String	Required
The 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.

Examples

kotlin

Parameter	Value
methodPattern	FILTER_REG_BEAN_SET_FILTER
propertyName	filter

kotlin

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
    }
}

Diff

@@ -7,1 +7,1 @@
    fun requestResponseFilterRegistration(requestResponseFilter: Filter): FilterRegistrationBean<Filter> {
        val registration = FilterRegistrationBean<Filter>()
-       registration.filter = requestResponseFilter
+       registration.setFilter(requestResponseFilter)
        return registration

Usage

Run this recipe

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:0.35.0

Data tables

Source files that had results

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column	Description
Source path before the run	The source path of the file before the run. null when a source file was created during the run.
Source path after the run	A 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 changes	In 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 changes	The specific recipe that made a change.
Estimated time saving	An estimated effort that a developer to fix manually instead of using this recipe, in unit of seconds.
Cycle	The recipe cycle in which the change was made.

Source files that had search results

org.openrewrite.table.SearchResults

Search results that were found during the recipe run.

Column	Description
Source path of search result before the run	The source path of the file with the search result markers present.
Source path of search result after run the run	A recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Result	The trimmed printed tree of the LST element that the marker is attached to.
Description	The content of the description of the marker.
Recipe that added the search marker	The specific recipe that added the Search marker.

Source files that errored on a recipe

org.openrewrite.table.SourcesFileErrors

The details of all errors produced by a recipe run.

Column	Description
Source path	The file that failed to parse.
Recipe that made changes	The specific recipe that made a change.
Stack trace	The stack trace of the failure.

Recipe performance

org.openrewrite.table.RecipeRunStats

Statistics used in analyzing the performance of recipes.

Column	Description
The recipe	The recipe whose stats are being measured both individually and cumulatively.
Source file count	The number of source files the recipe ran over.
Source file changed count	The number of source files which were changed in the recipe run. Includes files created, deleted, and edited.
Cumulative scanning time (ns)	The total time spent across the scanning phase of this recipe.
Max scanning time (ns)	The max time scanning any one source file.
Cumulative edit time (ns)	The total time spent across the editing phase of this recipe.
Max edit time (ns)	The max time editing any one source file.