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Preserve explicit type arguments in MigrateCollections* recipes#1099

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tim/fix-issue-1097
May 13, 2026
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Preserve explicit type arguments in MigrateCollections* recipes#1099
timtebeek merged 1 commit into
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tim/fix-issue-1097

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@timtebeek timtebeek commented May 13, 2026

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Summary

  • Fixes MigrateCollectionsEmptyMap strips explicit type arguments, breaking ternary type inference #1097: Collections.<K, V>emptyMap() was being rewritten to Map.of(), dropping the type witness and producing code that no longer compiles in ternary expressions where the compiler cannot infer type parameters from context.
  • Carry over the original method invocation's typeParameters onto the rewritten Map.of() / List.of() / Set.of() call.
  • Applied the same fix to the sibling MigrateCollectionsEmptyList and MigrateCollectionsEmptySet recipes, which had the same bug.

Test plan

  • Added preserveExplicitTypeArgumentsInTernary regression test to MigrateCollectionsEmptyMapTest.
  • ./gradlew test --tests "org.openrewrite.java.migrate.util.MigrateCollectionsEmpty*Test" passes.

@timtebeek
Preserve explicit type arguments in MigrateCollections* recipes
ffbc5ad 
Without this, `Collections.<K, V>emptyMap()` was rewritten to `Map.of()`,
losing the type witness needed in contexts like ternaries where the
compiler cannot otherwise infer the type parameters.
@github-project-automation github-project-automation Bot moved this to In Progress in OpenRewrite May 13, 2026
@timtebeek
timtebeek marked this pull request as ready for review May 13, 2026 14:38
@timtebeek
timtebeek merged commit d5db0d7 into main May 13, 2026
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@github-project-automation github-project-automation Bot moved this from In Progress to Done in OpenRewrite May 13, 2026
@timtebeek
timtebeek deleted the tim/fix-issue-1097 branch May 13, 2026 14:38
mergify Bot added a commit to robfrank/linklift that referenced this pull request Jun 4, 2026
@mergify
chore(deps): bump org.openrewrite.recipe:rewrite-migrate-java from 3.…
b60e1b8 
…34.0 to 3.36.0 [skip ci]

Bumps [org.openrewrite.recipe:rewrite-migrate-java](https://github.com/openrewrite/rewrite-migrate-java) from 3.34.0 to 3.36.0.
Release notes

*Sourced from [org.openrewrite.recipe:rewrite-migrate-java's releases](https://github.com/openrewrite/rewrite-migrate-java/releases).*

> 3.36.0
> ------
>
> What's Changed
> --------------
>
> * Move StringFormatted recipe from Java 17 upgrade to Java best practices by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1106](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1106)
> * Skip `IfElseIfConstructToSwitch` when a trailing non-`== null` binary check is present by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1109](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1109)
> * Skip `UseTextBlocks` when literal value matches its source by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1111](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1111)
> * Skip `UseMapOf` for `HashMap` subclasses like `LinkedHashMap` and `TreeMap` by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1113](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1113)
> * Skip `RenameUnderscoreIdentifier` on Kotlin and Groovy sources by [`@​MBoegers`](https://github.com/MBoegers) in [openrewrite/rewrite-migrate-java#1114](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1114)
> * Do not add `java.io.IO` import in `ReplaceSystemOutWithIOPrint` by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1118](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1118)
> * fix: do not replace lambda params with underscore when used as assignment target by [`@​darrencilia`](https://github.com/darrencilia) in [openrewrite/rewrite-migrate-java#1117](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1117)
> * Route WSS4J message.token classes to their real 2.x packages by [`@​Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-migrate-java#1122](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1122)
> * Migrate `com.sun.xml.bind.marshaller.NamespacePrefixMapper` to `org.glassfish.jaxb.runtime.marshaller.NamespacePrefixMapper` by [`@​Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-migrate-java#1121](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1121)
> * Fix `RefineSwitchCases` generating invalid guard on enum constant labels by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1124](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1124)
> * Skip unparseable Java versions in FindJavaVersion instead of reporting -1 by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1125](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1125)
>
> New Contributors
> ----------------
>
> * [`@​darrencilia`](https://github.com/darrencilia) made their first contribution in [openrewrite/rewrite-migrate-java#1117](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1117)
>
> **Full Changelog**: <openrewrite/rewrite-migrate-java@v3.35.0...v3.36.0>
>
> 3.35.0
> ------
>
> What's Changed
> --------------
>
> * Add `java.io.IO` import in `ReplaceSystemOutWithIOPrint` by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1093](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1093)
> * Skip `UseMapOf` when `put()` argument is a null literal by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1094](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1094)
> * Migrate JAXB XJC binding files declaring version 2.0/2.1/2.2 by [`@​MBoegers`](https://github.com/MBoegers) in [openrewrite/rewrite-migrate-java#1098](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1098)
> * Preserve explicit type arguments in MigrateCollections\* recipes by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1099](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1099)
> * Route Maven through Moderne Artifactory cache to avoid HTTP 429 by [`@​Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-migrate-java#1096](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1096)
> * Load sun.internal.new[Class].jar directly to fix CI test failures by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1101](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1101)
> * Skip explicit type arguments containing wildcards in `UseVarForGenericMethodInvocations` by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1102](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1102)
> * Skip `var` when target type inference widens a generic argument by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1103](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1103)
> * Skip `IfElseIfConstructToSwitch` when `instanceof` types are missing by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1095](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1095)
> * Revert inline Maven mirror (now in gh-automation#95) by [`@​Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-migrate-java#1104](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1104)
> * Aggregate FindJavaVersion to one row per repository by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1105](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1105)
>
> **Full Changelog**: <openrewrite/rewrite-migrate-java@v3.34.1...v3.35.0>
>
> v3.34.1
> -------
>
> What's Changed
> --------------
>
> * OpenRewrite [v8.81.6](https://github.com/openrewrite/rewrite/releases/tag/v8.81.6)
> * Refresh UpdateSdkManTest fixtures after SDKMAN CSV update by [`@​steve-aom-elliott`](https://github.com/steve-aom-elliott) in [openrewrite/rewrite-migrate-java#1073](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1073)
> * Add more static analysis recipes to java-best-practices by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1075](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1075)
> * OpenRewrite recipe best practices by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1074](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1074)
> * Add jspecify hyperlink by [`@​sullis`](https://github.com/sullis) in [openrewrite/rewrite-migrate-java#1076](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1076)
> * Skip `var` when reassignment relies on declared supertype by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1078](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1078)
> * Keep parentheses when renaming typed lambda parameter to underscore by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1082](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1082)
> * Document null-probing semantic differences in singleton migrations by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1081](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1081)
> * Skip main migration when referenced as static API by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1084](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1084)
> * Skip `Immutable*.copyOf` rewrite when argument is not a `Collection` by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1089](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1089)
> * Keep block body when refined switch arm contains an if statement by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#1088](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/1088)

... (truncated)


Commits

* [`d4df178`](openrewrite/rewrite-migrate-java@d4df178) Skip unparseable Java versions in FindJavaVersion instead of reporting -1 ([#1](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/1)...
* [`b8a298e`](openrewrite/rewrite-migrate-java@b8a298e) Fix `RefineSwitchCases` generating invalid guard on enum constant labels ([#1124](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/1124))
* [`c7f400b`](openrewrite/rewrite-migrate-java@c7f400b) [Auto] SDKMAN! Java candidates as of 2026-06-01T1550
* [`fca7c7c`](openrewrite/rewrite-migrate-java@fca7c7c) Migrate `com.sun.xml.bind.marshaller.NamespacePrefixMapper` to `org.glassfish...
* [`74017b2`](openrewrite/rewrite-migrate-java@74017b2) Route WSS4J message.token classes to their real 2.x packages ([#1122](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/1122))
* [`52b0808`](openrewrite/rewrite-migrate-java@52b0808) OpenRewrite recipe best practices
* [`23e5804`](openrewrite/rewrite-migrate-java@23e5804) Update Gradle wrapper 9.5.1
* [`21548bd`](openrewrite/rewrite-migrate-java@21548bd) fix: do not replace lambda params with underscore when used as assignment tar...
* [`61e7d90`](openrewrite/rewrite-migrate-java@61e7d90) Do not add `java.io.IO` import in `ReplaceSystemOutWithIOPrint` ([#1118](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/1118))
* [`dec86d0`](openrewrite/rewrite-migrate-java@dec86d0) Skip `RenameUnderscoreIdentifier` on Kotlin and Groovy sources ([#1114](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/1114))
* Additional commits viewable in [compare view](openrewrite/rewrite-migrate-java@v3.34.0...v3.36.0)
  
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MigrateCollectionsEmptyMap strips explicit type arguments, breaking ternary type inference

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