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openrewrite

24 indexed repositories · View on GitHub

rewrite
Automated mass refactoring of source code.

Java · 3734 stars
rewrite-spring
OpenRewrite recipes for Spring projects.

Java · 403 stars
rewrite-maven-plugin
OpenRewrite's Maven plugin.

Java · 189 stars
rewrite-migrate-java
OpenRewrite recipes for migrating to newer versions of Java.

Java · 156 stars
rewrite-testing-frameworks
OpenRewrite recipes that perform common Java testing migration tasks.

Java · 100 stars
rewrite-gradle-plugin
OpenRewrite's Gradle plugin.

Java · 88 stars
rewrite-static-analysis
OpenRewrite recipes for identifying and fixing static analysis issues.

Java · 62 stars
rewrite-docs
Stores the markdown documents used to generate docs.openrewrite.org

HTML · 55 stars
rewrite-logging-frameworks
OpenRewrite recipes for assisting with Java logging migration tasks.

Java · 34 stars
rewrite-java-dependencies
OpenRewrite recipes for managing Java dependencies.

Java · 18 stars
rewrite-templating
Automated templating using code snippets.

Java · 18 stars
rewrite-recipe-bom
Align version numbers for all OpenRewrite maintained recipe modules

18 stars
rewrite-analysis
OpenRewrite recipes for data flow analysis.

Java · 16 stars
rewrite-micronaut
OpenRewrite recipes for Micronaut.

Java · 14 stars
rewrite-jenkins
OpenRewrite recipes to continuously modernize Jenkins plugins.

Java · 13 stars
rewrite-quarkus
OpenRewrite recipes for Quarkus.

Java · 10 stars
rewrite-recipe-markdown-generator
Utility that generates OpenRewrite recipe documentation in markdown format for all recipes on the classpath.

Kotlin · 9 stars
rewrite-hibernate
OpenRewrite recipes for Hibernate ORM.

Java · 8 stars
rewrite-apache
OpenRewrite recipes for Apache projects.

Java · 6 stars
rewrite-cucumber-jvm
OpenRewrite recipes for CucumberJVM.

Java · 5 stars
4 more repositories live on View on GitHub

Beginner friendly Everything

Open All

Issue when MockedStatic field is defined with an inline Mockito.mockStatic initialiser Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 74/100

openrewrite/rewrite-testing-frameworks#1127 · Opened Sep 17, 2026
Spring Boot 4.1 upgrade recipe Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

openrewrite/rewrite-spring#1147 · Opened Sep 17, 2026
Handle new HTTP statuses from Spring 7 Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

openrewrite/rewrite-spring#1146 · Opened Sep 16, 2026
Migrate to hypersistence-utils-hibernate-73 for Hibernate 7.3/7.4 Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

openrewrite/rewrite-hibernate#99 · Opened Sep 16, 2026
ForLoopIncrementInUpdate changes behavior when the loop body contains continue Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

openrewrite/rewrite-static-analysis#1061 · Opened Sep 16, 2026
Java 25 with Kotlin - can keep jdk 24 pin, even if recipe upgraded kotlin above 2.3 Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 64/100

openrewrite/rewrite-migrate-java#1240 · Opened Sep 14, 2026
GroovyParser - errors on lambda arg without parens Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 75/100

openrewrite/rewrite#8879 · 1 comment · Opened Sep 14, 2026
`ParameterizedRunnerToParameterized` silently skips classes whose `@Parameters` method is inherited, leaving a partially migrated class that Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 68/100

openrewrite/rewrite-testing-frameworks#1126 · Opened Sep 14, 2026
`JUnit4to5Migration` moves `Parameterized` parameter assignment after `@BeforeEach`, so setup methods read null Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 70/100

openrewrite/rewrite-testing-frameworks#1125 · Opened Sep 14, 2026
`ExpectedExceptionToAssertThrows` emits uncompilable code when `expect(Matcher)` is given a matcher narrower than `Throwable` Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 65/100

openrewrite/rewrite-testing-frameworks#1124 · Opened Sep 14, 2026
`JUnit4to5Migration` creates one `mockStatic` registration per stubbing inside `@Before`, which Mockito rejects at runtime Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 78/100

openrewrite/rewrite-testing-frameworks#1123 · Opened Sep 14, 2026
ReplaceUnusedVariablesWithUnderscore renames existing unnamed catch parameter `_` to `Throwable_ _` when Java 25 sources are parsed on JDK 21 Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

openrewrite/rewrite-migrate-java#1239 · 1 comment · Opened Sep 13, 2026
Extend RemoveRedundantDependencyVersions to also remove redundant dependencyManagement entries managed by an imported BOM Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

openrewrite/rewrite#8862 · 1 comment · Opened Sep 11, 2026
Moderne CLI mcp `grep`: brace-expansion glob silently returns "No matches found" instead of an error Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

openrewrite/rewrite#8856 · Opened Sep 11, 2026
AddSerialVersionUidToSerializable skips generic classes implementing Serializable Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 78/100

openrewrite/rewrite-static-analysis#1055 · Opened Sep 10, 2026
RPC-backed languages: parsed source files have no FileAttributes Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

openrewrite/rewrite#8844 · Opened Sep 10, 2026
ChangePropertyKey + UnfoldProperties produce duplicate-key (invalid) YAML when relocating multiple properties into the same new nested prefix (regression from #8291) Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

openrewrite/rewrite#8838 · Opened Sep 9, 2026
Cannot upgrade to 3.38.0 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

openrewrite/rewrite#8792 · 8 comments · Opened Sep 7, 2026
Python: an import normalizer for files mixing `import m` and `from m import x` Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

openrewrite/rewrite#8791 · Opened Sep 6, 2026
UpgradePluginVersion cannot raise a plugin whose version is managed by a parent outside the repository Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

openrewrite/rewrite#8775 · 1 comment · Opened Sep 4, 2026
Python: class decorated with an Any-returning decorator loses its type and its bases Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

openrewrite/rewrite#8772 · Opened Sep 4, 2026
EmptyBlock and RemoveMethodsOnlyCallSuper delete blocks and methods whose only content is a comment Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

openrewrite/rewrite-static-analysis#1050 · Opened Sep 3, 2026
ChangePackage/ChangeType do not apply to package-info.java Javadoc Open

Difficulty 3/5 1-2 days Newbie friendliness 75/100

openrewrite/rewrite#8731 · 1 comment · Opened Sep 1, 2026
Change preview in moderne.io shows tabs vs spaces substitutions as actual changes whereas generated diffs or PRs do not include those Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

openrewrite/rewrite#8722 · Opened Aug 30, 2026
UpgradeToJava25 bundles ReplaceSystemOutWithIOPrint, an opinionated API change, into a version upgrade Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

openrewrite/rewrite-migrate-java#1228 · 1 comment · Opened Aug 30, 2026
Mockito1to5Migration leaves anyListOf uncompilable when matchers are reached through `import static org.mockito.Mockito.*` Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

openrewrite/rewrite-testing-frameworks#1115 · Opened Aug 30, 2026
Version 3.38.0 depends on OpenRewrite version not yet present on Maven Central Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

openrewrite/rewrite-recipe-bom#68 · 3 comments · Opened Aug 30, 2026
Feedback from a 152k-line Java 8 to 25 migration: the silent behavioural changes that cost the most, and which have no recipe Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

openrewrite/rewrite-migrate-java#1227 · 1 comment · Opened Aug 30, 2026
AddSetUseTrailingSlashMatch is in no composite, so Spring Framework 6 migrations silently 404 every trailing-slash URL Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

openrewrite/rewrite-spring#1142 · Opened Aug 30, 2026
MigrateJUnitTestCase rewrites super.run(TestResult) to Assertions.run(...), which does not exist Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

openrewrite/rewrite-testing-frameworks#1114 · Opened Aug 30, 2026
MigrateToHibernate70/71 leaves persistence.xml at version 3.0 while installing Hibernate 7, which requires Jakarta Persistence 3.2 Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

openrewrite/rewrite-hibernate#97 · Opened Aug 30, 2026
MigrateDialect does not migrate dialects configured in persistence.xml or hibernate.cfg.xml, though it does handle .properties and .yml Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

openrewrite/rewrite-hibernate#96 · Opened Aug 30, 2026
JUnit4to5Migration removes junit:junit without adding Jupiter when tests extend junit.framework.TestCase Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

openrewrite/rewrite-testing-frameworks#1113 · Opened Aug 29, 2026
Java parse-to-print idempotence: untyped lambda in super() prints as varprocessBuilder Open

bug java java 25+

Difficulty 3/5 1-2 days Newbie friendliness 68/100

openrewrite/rewrite#8712 · 3 comments · Opened Aug 29, 2026
Plugin 7.41.0 published with dependency on missing rewrite-bom:8.91.0 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

openrewrite/rewrite-gradle-plugin#476 · 5 comments · Opened Aug 28, 2026
JUnit 4 to 5 migration discards the one-time setup a `TestSetup` decorator performed, breaking tests at run time Open

bug

Difficulty 5/5 Over a week Newbie friendliness 48/100

openrewrite/rewrite-testing-frameworks#1110 · Opened Aug 26, 2026
Refactor JAXB out Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 68/100

openrewrite/rewrite#8669 · Opened Aug 26, 2026
Kotlin recipe DSL: scan/generate phases silently dropped in K2 synthesis Open

kotlin recipe

Difficulty 4/5 3-5 days Newbie friendliness 55/100

openrewrite/rewrite#8657 · 1 comment · 1 reaction · Opened Aug 26, 2026
UpgradeDependencyVersion bumps a shared version property to a version its siblings never published Open

bug maven

openrewrite/rewrite#8656 · 2 comments · 1 assignee · Opened Aug 26, 2026
StackOverflowError: unbounded mutual recursion between the argument→select and select→argument steps in ForwardFlow.computeVariableAssignment Open

Difficulty 4/5 3-5 days Newbie friendliness 72/100

openrewrite/rewrite-analysis#113 · Opened Aug 26, 2026
RemoveUnusedImports throws IndexOutOfBoundsException unfolding a static wildcard import from a package with a capitalized segment Open

bug

Difficulty 1/5 Under an hour Newbie friendliness 92/100

openrewrite/rewrite#8654 · Opened Aug 26, 2026
A retained `TestCase(String)` constructor leaves the migrated test class unrunnable under JUnit 5 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 70/100

openrewrite/rewrite-testing-frameworks#1108 · 1 comment · Opened Aug 25, 2026
`MigrateJUnitTestCase` removes the `TestCase(String)` constructor without updating its callers, breaking compilation Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

openrewrite/rewrite-testing-frameworks#1107 · Opened Aug 25, 2026
Most language `Assertions` ignore `TypeValidation` entirely, including `unknown()` Open

enhancement parser

Difficulty 5/5 Over a week Newbie friendliness 42/100

openrewrite/rewrite#8568 · Opened Aug 20, 2026
[Spring Boot 4] Integrate Spring Data 4 migration and honour datastore migration blockers Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

openrewrite/rewrite-spring#1126 · 1 reaction · Opened Aug 13, 2026
RecipeRun does not distinguish a fixpoint from an exhausted cycle budget Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

openrewrite/rewrite#8498 · Opened Aug 13, 2026
Gradle ChangeDependency leaves an unversioned dependency when the new coordinates are unmanaged Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

openrewrite/rewrite#8465 · Opened Aug 11, 2026
Renaming coordinates without a newVersion carries the old version over to the new artifact Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

openrewrite/rewrite#8464 · Opened Aug 11, 2026
Renaming a parent's dependencyManagement leaves child modules with a stale MavenResolutionResult Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

openrewrite/rewrite#8463 · Opened Aug 11, 2026
ChangeDependency renames a managed dependency into unmanaged coordinates, leaving it without a version Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

openrewrite/rewrite#8462 · Opened Aug 11, 2026

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