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Add recipes to convert double-brace initialization of ArrayList and
HashSet to List.of() and Set.of() respectively for Java 10+. These
recipes complement the existing UseMapOf recipe.
Example transformation for UseListOf:
new ArrayList<>() {{ add("a"); add("b"); }}
becomes
List.of("a", "b")
Example transformation for UseSetOf:
new HashSet<>() {{ add("a"); add("b"); }}
becomes
Set.of("a", "b")
Fixes: moderneinc/customer-requests#1544
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Feb 14, 2026
…26.0 to 3.27.0 [skip ci] Bumps [org.openrewrite.recipe:rewrite-migrate-java](https://github.com/openrewrite/rewrite-migrate-java) from 3.26.0 to 3.27.0. Release notes *Sourced from [org.openrewrite.recipe:rewrite-migrate-java's releases](https://github.com/openrewrite/rewrite-migrate-java/releases).* > 3.27.0 > ------ > > What's Changed > -------------- > > * Add jakarta.annotation-api dependency when using javax.annotation by [`@jkschneider`](https://github.com/jkschneider) in [openrewrite/rewrite-migrate-java#972](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/972) > * Add com.sun.istack.NotNull migration to Jakarta validation by [`@jkschneider`](https://github.com/jkschneider) in [openrewrite/rewrite-migrate-java#973](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/973) > * Add UseListOf and UseSetOf recipes by [`@jkschneider`](https://github.com/jkschneider) in [openrewrite/rewrite-migrate-java#974](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/974) > * Lombok Annotation Processor Configuration by [`@MBoegers`](https://github.com/MBoegers) in [openrewrite/rewrite-migrate-java#977](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/977) > * Migrate GraalVM resource-config.json from regex to glob patterns by [`@MBoegers`](https://github.com/MBoegers) in [openrewrite/rewrite-migrate-java#976](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/976) > * Followup after the formatting merge by [`@Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-migrate-java#978](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/978) > * Avoid line continuation escapes in text blocks with mixed newline content by [`@Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-migrate-java#975](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/975) > * Change Docker image version in Java upgrades by [`@timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-migrate-java#980](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/980) > > **Full Changelog**: <openrewrite/rewrite-migrate-java@v3.26.0...v3.27.0> Commits * [`04592ca`](openrewrite/rewrite-migrate-java@04592ca) Expect continuation indent in text blocks * [`f42714b`](openrewrite/rewrite-migrate-java@f42714b) Delete files * [`9499e38`](openrewrite/rewrite-migrate-java@9499e38) [Auto] SDKMAN! Java candidates as of 2026-02-09T1052 * [`ca26543`](openrewrite/rewrite-migrate-java@ca26543) Change Docker image version in Java upgrades ([#980](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/980)) * [`6e525a1`](openrewrite/rewrite-migrate-java@6e525a1) Make declarative recipes singletons * [`dc6029d`](openrewrite/rewrite-migrate-java@dc6029d) [Auto] SDKMAN! Java candidates as of 2026-02-02T1038 * [`e13f6e8`](openrewrite/rewrite-migrate-java@e13f6e8) Update documentation examples * [`653dd7c`](openrewrite/rewrite-migrate-java@653dd7c) Add avoidLineContinuations option to UseTextBlocks ([#975](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/975)) * [`c6b1bcf`](openrewrite/rewrite-migrate-java@c6b1bcf) Followup after the formatting merge ([#978](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/978)) * [`4f3aaa0`](openrewrite/rewrite-migrate-java@4f3aaa0) Migrate GraalVM resource-config.json from regex to glob patterns ([#976](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/976)) * Additional commits viewable in [compare view](openrewrite/rewrite-migrate-java@v3.26.0...v3.27.0) [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- Dependabot commands and options You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot show ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
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Summary
UseListOfrecipe to convertnew ArrayList<>() {{ add(...) }}toList.of(...)UseSetOfrecipe to convertnew HashSet<>() {{ add(...) }}toSet.of(...)UseMapOfrecipe for Java 10+ codebasesTest plan
Added test cases for field-level and method-level double-brace initialization
Added test cases for single and multiple elements
Added test cases for non-string types and constants
Added test cases verifying no change when constructor has arguments
Added test cases verifying no change when block contains non-add statements
All tests pass locally
Fixes: moderneinc/customer-requests#1544