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Hey everyone, we've internally been having problem...
# compose
t
Hey everyone, we've internally been having problems with the rendering of our preview composables. We often, but not always, get 
java.lang.NoClassDefFoundError
for our previews, with the call stack indicating a problem with our font setup. Our font/theming setup is admittedly a little unorthodox, but I'd love to know if there's something we can do to fix it. I've added some more details in this thread.
We have a few build flavors in our app, each of which can have different fonts and theming. We usually pick the current font based on the 
BuildConfig.FLAVOR_theme
constant, which we then store inside a composition local. This gives us the option to override it in our previews and view our composables with all possible themes. Does anyone know whether this use of the BuildConfig in compose previews is problematic? What confuses me the most is that this setup works some of the time, but a simple clean and rebuild is not enough to fix it when it doesn't work.
Example stack trace with some details redacted:
Copy code
java.lang.NoClassDefFoundError: com/example/compose/shared/theme/FontKt
	at com.example.compose.androidtv.components.pill.PillKt.Pill$lambda$9(Pill.kt:70)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:130)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.material3.ButtonKt$Button$2$1.invoke(Button.kt:1140)
	at androidx.compose.material3.ButtonKt$Button$2$1.invoke(Button.kt:139)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:364)
	at androidx.compose.material3.internal.ProvideContentColorTextStyleKt.ProvideContentColorTextStyle-3J-VO9M(ProvideContentColorTextStyle.kt:41)
	at androidx.compose.material3.ButtonKt$Button$2.invoke(Button.kt:136)
	at androidx.compose.material3.ButtonKt$Button$2.invoke(Button.kt:135)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.material3.SurfaceKt$Surface$2.invoke(Surface.kt:229)
	at androidx.compose.material3.SurfaceKt$Surface$2.invoke(Surface.kt:209)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:364)
	at androidx.compose.material3.SurfaceKt.Surface-o_FOJdg(Surface.kt:206)
	at androidx.compose.material3.ButtonKt.Button(Button.kt:125)
	[redacted]
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at androidx.compose.ui.tooling.ComposableInvoker.invokeComposableMethod(ComposableInvoker.jvm.kt:185)
	at androidx.compose.ui.tooling.ComposableInvoker.invokeComposable(ComposableInvoker.jvm.kt:222)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3$1$composable$1$1.invoke(ComposeViewAdapter.android.kt:478)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3$1$composable$1$1.invoke(ComposeViewAdapter.android.kt:476)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3$1.invoke(ComposeViewAdapter.android.kt:519)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3$1.invoke(ComposeViewAdapter.android.kt:469)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:364)
	at androidx.compose.ui.tooling.InspectableKt.Inspectable(Inspectable.android.kt:58)
	at androidx.compose.ui.tooling.ComposeViewAdapter$WrapPreview$1.invoke(ComposeViewAdapter.android.kt:414)
	at androidx.compose.ui.tooling.ComposeViewAdapter$WrapPreview$1.invoke(ComposeViewAdapter.android.kt:413)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:364)
	at androidx.compose.ui.tooling.ComposeViewAdapter.WrapPreview(ComposeViewAdapter.android.kt:408)
	at androidx.compose.ui.tooling.ComposeViewAdapter.access$WrapPreview(ComposeViewAdapter.android.kt:123)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3.invoke(ComposeViewAdapter.android.kt:469)
	at androidx.compose.ui.tooling.ComposeViewAdapter$init$3.invoke(ComposeViewAdapter.android.kt:466)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.ui.platform.ComposeView.Content(ComposeView.android.kt:431)
	at androidx.compose.ui.platform.AbstractComposeView$ensureCompositionCreated$1.invoke(ComposeView.android.kt:250)
	at androidx.compose.ui.platform.AbstractComposeView$ensureCompositionCreated$1.invoke(ComposeView.android.kt:250)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:364)
	at androidx.compose.ui.platform.CompositionLocalsKt.ProvideCommonCompositionLocals(CompositionLocals.kt:216)
	at androidx.compose.ui.platform.AndroidCompositionLocals_androidKt$ProvideAndroidCompositionLocals$3.invoke(AndroidCompositionLocals.android.kt:122)
	at androidx.compose.ui.platform.AndroidCompositionLocals_androidKt$ProvideAndroidCompositionLocals$3.invoke(AndroidCompositionLocals.android.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:364)
	at androidx.compose.ui.platform.AndroidCompositionLocals_androidKt.ProvideAndroidCompositionLocals(AndroidCompositionLocals.android.kt:110)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1$1$3.invoke(Wrapper.android.kt:140)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1$1$3.invoke(Wrapper.android.kt:139)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:384)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1$1.invoke(Wrapper.android.kt:139)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1$1.invoke(Wrapper.android.kt:123)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:121)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:51)
	at androidx.compose.runtime.internal.Utils_jvmKt.invokeComposable(Utils.jvm.kt:27)
	at androidx.compose.runtime.ComposerImpl.doCompose-aFTiNEg(Composer.kt:3694)
	at androidx.compose.runtime.ComposerImpl.composeContent--ZbOJvo$runtime_release(Composer.kt:3616)
	at androidx.compose.runtime.CompositionImpl.composeContent(Composition.kt:792)
	at androidx.compose.runtime.Recomposer.composeInitial$runtime_release(Recomposer.kt:1132)
	at androidx.compose.runtime.CompositionImpl.composeInitial(Composition.kt:677)
	at androidx.compose.runtime.CompositionImpl.setContent(Composition.kt:616)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:123)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:114)
	at androidx.compose.ui.platform.AndroidComposeView.setOnViewTreeOwnersAvailable(AndroidComposeView.android.kt:1970)
	at androidx.compose.ui.platform.WrappedComposition.setContent(Wrapper.android.kt:114)
	at androidx.compose.ui.platform.WrappedComposition.onStateChanged(Wrapper.android.kt:168)
	at androidx.lifecycle.LifecycleRegistry$ObserverWithState.dispatchEvent(LifecycleRegistry.jvm.kt:313)
	at androidx.lifecycle.LifecycleRegistry.addObserver(LifecycleRegistry.jvm.kt:191)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:121)
	at androidx.compose.ui.platform.WrappedComposition$setContent$1.invoke(Wrapper.android.kt:114)
	at androidx.compose.ui.platform.AndroidComposeView.onAttachedToWindow(AndroidComposeView.android.kt:2049)
	at android.view.View.dispatchAttachedToWindow(View.java:23071)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3518)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3525)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3525)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3525)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3525)
	at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3525)
	at android.view.AttachInfo_Accessor.setAttachInfo(AttachInfo_Accessor.java:69)
	at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:362)
	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:462)
	at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:125)
	at com.android.tools.rendering.RenderTask.createRenderSession(RenderTask.java:829)
	at com.android.tools.rendering.RenderTask.lambda$inflate$7(RenderTask.java:977)
	at com.android.tools.rendering.RenderExecutor.runAsyncActionWithTimeout$lambda$12(RenderExecutor.kt:217)
	at com.android.tools.rendering.RenderExecutor$PriorityRunnable.run(RenderExecutor.kt:338)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.example.compose.shared.theme.FontKt
	... 103 more
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