Yesterday, our Android app crashed with a weird NoSuchMethodError. java.lang.NoSuchMethodError: No interface method removeFirst()Ljava/lang/Object; in class Ljava/util/List; or its super classes (declaration of ‘java.util.List’ appears in /apex/com.android.art/javalib/core-oj.jar) at app.cash.redwood.lazylayout.widget.LazyListUpdateProcessor.onEndChanges(SourceFile:165) at app.cash.redwood.lazylayout.view.ViewLazyList.onEndChanges(SourceFile:210) at app.cash.redwood.protocol.widget.ProtocolBridge.sendChanges(SourceFile:125) at app.cash.redwood.treehouse.ViewContentCodeBinding.receiveChangesOnUiDispatcher(SourceFile:419) at app.cash.redwood.treehouse.ViewContentCodeBinding$sendChanges$1.invokeSuspend(SourceFile:383) at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(SourceFile:33) at kotlinx.coroutines.DispatchedTask.run(SourceFile:104) at android.os.Handler.handleCallback(Handler.java:938) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:250) at android.app.ActivityThread.main(ActivityThread.java:7868) The offending code is written in…

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The last post featured some Kotlin code inadvertently targeting a new Java API when the build JDK was bumped to 21. This can be solved with the -Xjdk-release Kotlin compiler flag, or by using Gradle toolchains to build with an old JDK. If you read the Gradle docs… Using Java toolchains is a preferred way…

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There was a time when I used Maven heavily, but today all the libraries I work on build with Gradle. Even though I’m publishing with Gradle, consumers can use Gradle, Maven, Bazel, jars in libs/ (but please don’t), or anything else. That’s a huge JVM ecosystem win! In general, I don’t have to think about…

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You want to be using the latest JDK for development. Don’t use Gradle toolchains, they’ll needlessly force you to use old JDKs. You can still target and test on old JVM versions but develop with the latest and greatest. Java and the JDK are literally built for this. Locally this hasn’t been a problem. Homebrew…

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This post was published externally on Cash App Code Blog. Read it at https://code.cash.app/flow-testing-with-turbine.

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This post was published externally on Cash App Code Blog. Read it at https://code.cash.app/native-ui-and-multiplatform-compose-with-redwood.

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This post was published externally on Cash App Code Blog. Read it at https://code.cash.app/molecule-1-0.

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My primary work project for the better part of a year (named Redwood) is built on top of Compose1 and runs on every platform that Kotlin supports. This of course means Android, but we also have Compose running on iOS, the web, the JVM, and all other native targets. It’s truly a multiplatform Compose project2.…

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This post was published externally on Cash App Code Blog. Read it at https://code.cash.app/the-state-of-managing-state-with-compose.

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The equation y=mx+b defines a line in slope-intercept form. The line will intercept the y-axis at the value b and for each change in x its slope (the amount the line goes up or down) will change by m. Slope-intercept gives me a way to think about the design of libraries in relation to each…

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