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NFNicolas Fränkelfrankel.hashnode.devJun 26, 2025 · 6 min read

Testing an OpenRewrite recipe

For the last two weeks, I've kicked the tires of OpenRewrite. At first, I created a recipe to move Kotlin source files as per the official recommendations with a set package name. I then improved the recipe to compute the root automatically. In both ...

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NFNicolas Fränkelfrankel.hashnode.devJun 19, 2025 · 7 min read

Improving my previous OpenRewrite recipe

I started discovering OpenRewrite last week by writing a Kotlin recipe that moves Kotlin files according to the official directory structure recommendation. I mentioned some future works, and here they are. In this post, I want to describe how to com...

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NFNicolas Fränkelapisix.hashnode.devJun 12, 2025 · 6 min read

Authoring an OpenRewrite recipe

I've been eying OpenRewrite for some time, but I haven't had time to play with it yet. In case you never heard about OpenRewrite, OpenRewrite takes care of refactoring your codebase to newer language, framework, and paradigm versions. OpenRewrite is...

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BBitFlipperbitflippers.hashnode.devApr 18, 2024 · 2 min read

Fixing JavaTemplate Throwing ArrayIndexOutOfBounds

Are you getting a java.lang.ArrayIndexOutOfBoundsException from your JavaTemplate in your OpenRewrite recipe? If you are using substitution indicators (#{}) in your template string, you could have a mismatch between the number of indicators provided ...

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BBitFlipperbitflippers.hashnode.devApr 11, 2024 · 4 min read

How to resolve expected recipe cycle mismatch

Are you seeing an error message like this: Expected recipe to complete in 1 cycle, but took 2 cycles. This usually indicates the recipe is making changes after it should have stabilized. or Expected recipe to complete in 1 cycle, but took at least on...

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BBitFlipperbitflippers.hashnode.devApr 6, 2024 · 8 min read

Use GroqDoc and OpenRewrite to write your Javadoc

It is important to have Javadoc comments on our Java interfaces so developers know how the interface was intended to be implemented. Lets use OpenRewrite and an LLM to add Javadoc comments to our interfaces! GroqCloud For this blog we have used the G...

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BBitFlipperbitflippers.hashnode.devMar 2, 2024 · 4 min read

How to Duplicate Classes with OpenRewrite

Lets create a new DuplicateClass scanning recipe to show how we can use OpenRewrite to create new files. Why a Scanning Recipe? As we want to create a new file we cannot use the standard imperative recipe. Standard Recipes are only able to work on ex...

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BBitFlipperbitflippers.hashnode.devJan 14, 2024 · 4 min read

Debugging OpenRewrite AST that contains missing or invalid type information

You’ve finally managed to get your Java refactoring recipe working where it is producing the correct text output. Your unit test is still failing though with: java.lang.IllegalStateException: AST contains missing or invalid type information Why are t...

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#openrewrite

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Trending tags this week

Testing an OpenRewrite recipe

Improving my previous OpenRewrite recipe

Authoring an OpenRewrite recipe

Fixing JavaTemplate Throwing ArrayIndexOutOfBounds

How to resolve expected recipe cycle mismatch

Use GroqDoc and OpenRewrite to write your Javadoc

How to Duplicate Classes with OpenRewrite

Debugging OpenRewrite AST that contains missing or invalid type information