Java 25: Unused variable to underscore #844
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JohannisK
commented
Sep 9, 2025
src/main/java/org/openrewrite/java/migrate/lang/ReplaceUnusedVariablesWithUnderscore.java
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src/test/java/org/openrewrite/java/migrate/lang/ReplaceUnusedVariablesWithUnderscoreTest.java
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timtebeek
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Sep 9, 2025
timtebeek
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Sep 9, 2025
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Results look good at scale; turns out there's a ton of ignored exceptions that would be converted. Exception conversion
Lambda conversion
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Sep 21, 2025
…16.0 to 3.17.0 [skip ci] [//]: # (dependabot-start)⚠️ \*\*Dependabot is rebasing this PR\*\*⚠️ Rebasing might not happen immediately, so don't worry if this takes some time. Note: if you make any changes to this PR yourself, they will take precedence over the rebase. --- [//]: # (dependabot-end) Bumps [org.openrewrite.recipe:rewrite-migrate-java](https://github.com/openrewrite/rewrite-migrate-java) from 3.16.0 to 3.17.0. Release notes *Sourced from [org.openrewrite.recipe:rewrite-migrate-java's releases](https://github.com/openrewrite/rewrite-migrate-java/releases).* > 3.17.0 > ------ > > What's Changed > -------------- > > * Upgrading spotbugs plugin and mapstruct by [`@steve-aom-elliott`](https://github.com/steve-aom-elliott) in [openrewrite/rewrite-migrate-java#818](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/818) > * Migrate to `Process#waitFor(Duration)` as part of Java 25 upgrade by [`@JohannisK`](https://github.com/JohannisK) in [openrewrite/rewrite-migrate-java#840](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/840) > * Inflater deflater autoclosable by [`@JohannisK`](https://github.com/JohannisK) in [openrewrite/rewrite-migrate-java#843](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/843) > * Java 25: Unused variable to underscore by [`@JohannisK`](https://github.com/JohannisK) in [openrewrite/rewrite-migrate-java#844](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/844) > * Use `ZipException` instead of the deprecated `ZipError` by [`@JohannisK`](https://github.com/JohannisK) in [openrewrite/rewrite-migrate-java#841](https://redirect.github.com/openrewrite/rewrite-migrate-java/pull/841) > > **Full Changelog**: <openrewrite/rewrite-migrate-java@v3.16.0...v3.17.0> Commits * [`5037eac`](openrewrite/rewrite-migrate-java@5037eac) Use `ZipException` instead of the deprecated `ZipError` ([#841](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/841)) * [`d192070`](openrewrite/rewrite-migrate-java@d192070) Fix preconditions and remove intermediate `UpgradeBuildToJava25` * [`1a07e7f`](openrewrite/rewrite-migrate-java@1a07e7f) Java 25: Unused variable to underscore ([#844](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/844)) * [`804c6a9`](openrewrite/rewrite-migrate-java@804c6a9) OpenRewrite recipe best practices * [`201477d`](openrewrite/rewrite-migrate-java@201477d) Inflater deflater autoclosable ([#843](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/843)) * [`7e53332`](openrewrite/rewrite-migrate-java@7e53332) Migrate to `Process#waitFor(Duration)` as part of Java 25 upgrade ([#840](https://redirect.github.com/openrewrite/rewrite-migrate-java/issues/840)) * [`28c66ec`](openrewrite/rewrite-migrate-java@28c66ec) [Auto] SDKMAN! Java candidates as of 2025-09-08T1016 * [`1778ec6`](openrewrite/rewrite-migrate-java@1778ec6) Guard against new Ehcache releases in test output * [`db99c93`](openrewrite/rewrite-migrate-java@db99c93) Update comment with regards to switch pattern matching recipes * [`a6f20e4`](openrewrite/rewrite-migrate-java@a6f20e4) [Auto] SDKMAN! Java candidates as of 2025-09-01T1016 * Additional commits viewable in [compare view](openrewrite/rewrite-migrate-java@v3.16.0...v3.17.0) [](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 merge` will merge this PR after your CI passes on it - `@dependabot squash and merge` will squash and merge this PR after your CI passes on it - `@dependabot cancel merge` will cancel a previously requested merge and block automerging - `@dependabot reopen` will reopen this PR if it is closed - `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually - `@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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What's changed?
Since Java 22 unused variables can be named "_"
What's your motivation?
Using an "_" makes it explicit a variable is not used.