openrewrite/rewrite-migrate-java

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OpenRewrite recipes for migrating to newer versions of Java.

Stars: 156
Forks: 130
Open beginner issues: 0
Indexed issues: 40
Avg merge: 20h 57m
Merged PRs (30d): 21

Dominant language: Java
License: No license data
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

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40 open issues indexed

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
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
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
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
OptionalNotPresentToIsEmpty rewrites `!isPresent()` on a non-`java.util.Optional` type, producing uncompilable `isEmpty()` Open

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

openrewrite/rewrite-migrate-java#1146 · 3 comments · Opened Jun 25, 2026
Lombok annotation processor not added to modules of a Maven multi-module project Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 50/100

openrewrite/rewrite-migrate-java#1119 · 5 comments · Opened May 29, 2026
Possible regression in 6.37.0 version Open

bug

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

openrewrite/rewrite-migrate-java#1069 · 2 comments · Opened Apr 21, 2026
FacesManagedBeansRemoved for Faces 4.0 recipe updates Open

bug

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

openrewrite/rewrite-migrate-java#1023 · 4 comments · Opened Mar 23, 2026
NoGuava Recipe – Summary of the analysis on the Sirius-Desktop codebase Open

bug enhancement guava recipe

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

openrewrite/rewrite-migrate-java#928 · 1 comment · 1 reaction · Opened Oct 31, 2025
Lombok replaces uppercase getter method with generated camelCase, breaking existing code. Open

bug

openrewrite/rewrite-migrate-java#879 · 6 comments · 1 assignee · Opened Oct 20, 2025
Forbidden method invocation: `java.net.URL#<init>(java.lang.String,java.lang.String,int,java.lang.String,java.net.URLStreamHandler)` [Deprecated in Java 21] Open

java 21+ recipe

Difficulty 3/5 1-2 days Newbie friendliness 35/100

openrewrite/rewrite-migrate-java#849 · 3 comments · Opened Sep 14, 2025
Enhance IfElseIfConstructToSwitch to support "return" statements Open

enhancement java 21+ recipe

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

openrewrite/rewrite-migrate-java#776 · 1 comment · Opened Jun 23, 2025
UseVarForGenericMethodInvocations 'mvn rewrite:run' crash Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

openrewrite/rewrite-migrate-java#698 · 1 comment · 1 reaction · Opened Mar 27, 2025
Recipe for upgrading to Jetty 12.0.16 version Open

recipe

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

openrewrite/rewrite-migrate-java#1053 · 4 comments · 1 reaction · Opened Jan 27, 2025
Migrate StringTokenizer Open

recipe

Difficulty 3/5 1-2 days Newbie friendliness 42/100

openrewrite/rewrite-migrate-java#488 · 1 comment · Opened May 27, 2024
Include adding javafx dependencies with JDK17 upgrade recipe Open

enhancement recipe

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

openrewrite/rewrite-migrate-java#472 · 5 comments · Opened May 3, 2024
`PreferJavaUtilFunction` should not convert when used specifically as Guava type Open

bug guava

Difficulty 3/5 1-2 days Newbie friendliness 35/100

openrewrite/rewrite-migrate-java#436 · 1 comment · Opened Mar 20, 2024
PreferJavaUtilObjectsEquals does not check for existing equals method Open

bug guava

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

openrewrite/rewrite-migrate-java#434 · 2 comments · Opened Mar 20, 2024
Class To Record Open

recipe

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

openrewrite/rewrite-migrate-java#391 · 2 comments · 3 reactions · Opened Jan 12, 2024
`AddMissingMethodImplementation` generates wrong method for constructors Open

bug java

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

openrewrite/rewrite-migrate-java#360 · 2 comments · Opened Nov 22, 2023
Support for Ternary Operator assignments in var context Open

enhancement

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

openrewrite/rewrite-migrate-java#237 · Opened Jun 13, 2023
Apply var to method invocations Open

recipe

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

openrewrite/rewrite-migrate-java#236 · 4 comments · Opened Jun 12, 2023
Add migration of maven-jaxb2-plugin in JakartaEE9 recipe Open

enhancement recipe

Difficulty 3/5 1-2 days Newbie friendliness 35/100

openrewrite/rewrite-migrate-java#780 · 2 comments · 5 reactions · Opened May 7, 2023
Auto Lombok @Value Open

recipe

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

openrewrite/rewrite-migrate-java#1046 · Opened Apr 24, 2023
Hoist Lombok @Getter/@Setter to class level if appropriate Open

recipe

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

openrewrite/rewrite-migrate-java#1047 · 1 comment · Opened Apr 24, 2023
Auto Lombok @UtilityClass Open

recipe

Difficulty 4/5 3-5 days Newbie friendliness 25/100

openrewrite/rewrite-migrate-java#512 · 2 comments · Opened Apr 24, 2023
Replace usage of Optional.isPresent => get => else with map-> orElseGet Open

recipe

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

openrewrite/rewrite-migrate-java#1048 · 1 comment · Opened Apr 17, 2023
JDK 13+ : Headings should start with `h2` and `h4` Open

recipe

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

openrewrite/rewrite-migrate-java#208 · Opened Apr 14, 2023
Recipe UseTextBlocks: Textblock not constructed AFTER it encounters a variable in a string. Open

enhancement

openrewrite/rewrite-migrate-java#261 · 12 comments · 1 assignee · Opened Apr 2, 2023
Support Spring Boot apps with no explicit version config Open

design-partner-3 enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

openrewrite/rewrite-migrate-java#155 · 3 comments · Opened Dec 16, 2022
Convert Google Auto value to records Open

recipe

Difficulty 5/5 Over a week Newbie friendliness 25/100

openrewrite/rewrite-migrate-java#148 · Opened Dec 3, 2022
Replace Optional.get with Optional::orElseThrow Open

recipe

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

openrewrite/rewrite-migrate-java#147 · 3 comments · Opened Nov 14, 2022
Migrate from immutables to Java records Open

recipe

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

openrewrite/rewrite-migrate-java#116 · Opened Aug 4, 2022
Replace deprecated "denigrated" `java.security.cert` APIs that represent DNs as Principal or String objects. `JDK-8250970` Open

recipe

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

openrewrite/rewrite-migrate-java#113 · Opened Jun 21, 2022
Jakarta XML Binding API 4.0.0 migration recipe Open

recipe

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

openrewrite/rewrite-migrate-java#110 · Opened Jun 14, 2022
Convert java.text.SimpleDateFormat to java.time.format.DateTimeFormatter Open

recipe

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

openrewrite/rewrite-migrate-java#108 · 2 comments · Opened May 16, 2022
Java 11: use `Files.readString` to read a file to a String Open

guava recipe uses-dataflow

Difficulty 3/5 1-2 days Newbie friendliness 42/100

openrewrite/rewrite-migrate-java#91 · 2 comments · Opened Apr 15, 2022
Explore how to convert the legacy Date/Calendar classes to the JSR310 Date/Time library Open

recipe

Difficulty 5/5 Over a week Newbie friendliness 25/100

openrewrite/rewrite-migrate-java#86 · 4 reactions · Opened Apr 6, 2022
Migrate unmodifiableMap(..) to Map.of(..) Open

recipe

Difficulty 5/5 Over a week Newbie friendliness 25/100

openrewrite/rewrite-migrate-java#71 · Opened Mar 31, 2022
Investigate how to migrate CXF projects to Java 11 Open

recipe

Difficulty 5/5 Over a week Newbie friendliness 25/100

openrewrite/rewrite-migrate-java#28 · 1 comment · 1 reaction · Opened Jun 14, 2021

openrewrite/rewrite-migrate-java

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