IssueTracker

Oh, I misunderstood. So, using lint.do.not.reuse.uast.env is what causes the new crash? That is unfortunate, and I will investigate. Let me know if there is a sample project you can share that reproduces the issue.

Not sure if you still wanted the new bug, but here it is: https://issuetracker.google.com/issues/187851920

FYI the issue in comment #24 should be fixed by Change Ib7d4d6c9e in AGP 4.2.2.

And to confirm, lint.do.not.reuse.uast.env should no longer be needed at all in AGP 7.0+.

Thanks #29 . I am noticing that when this happens, after the error log for

package fragment is not found for module:<lintWithKotlin> is a module

There is another error

java.lang.IllegalArgumentException: Argument for @NotNull parameter 'descriptor' of org/jetbrains/kotlin/codegen/context/CodegenContext.intoPackagePart must not be null
	at org.jetbrains.kotlin.codegen.context.CodegenContext.$$$reportNull$$$0(CodegenContext.java)
	at org.jetbrains.kotlin.codegen.context.CodegenContext.intoPackagePart(CodegenContext.java)
	at org.jetbrains.kotlin.asJava.builder.LightClassDataProviderForClassOrObject$computeLightClassData$1$1.invoke(LightClassDataProvider.kt:51)
	at org.jetbrains.kotlin.asJava.builder.LightClassDataProviderForClassOrObject$computeLightClassData$1$1.invoke(LightClassDataProvider.kt:38)
	at org.jetbrains.kotlin.asJava.builder.LightClassBuilderKt.buildLightClass(LightClassBuilder.kt:64)
	at org.jetbrains.kotlin.asJava.builder.LightClassDataProviderForClassOrObject$computeLightClassData$1.invoke(LightClassDataProvider.kt:47)
	at org.jetbrains.kotlin.asJava.builder.LightClassDataProviderForClassOrObject$computeLightClassData$1.invoke(LightClassDataProvider.kt:38)
	at org.jetbrains.kotlin.cli.jvm.compiler.CliLightClassGenerationSupport.createDataHolderForClass(CliLightClassGenerationSupport.kt:64)
	at org.jetbrains.kotlin.asJava.builder.LightClassDataProviderForClassOrObject.computeLightClassData(LightClassDataProvider.kt:45)
	at org.jetbrains.kotlin.asJava.builder.LightClassDataProviderForClassOrObject.compute(LightClassDataProvider.kt:61)
	at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:54)
	at com.intellij.util.CachedValueBase.lambda$getValueWithLock$1(CachedValueBase.java:235)
	at com.intellij.openapi.util.RecursionManager$1.doPreventingRecursion(RecursionManager.java:113)
	at com.intellij.openapi.util.RecursionManager.doPreventingRecursion(RecursionManager.java:72)
	at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:236)
	at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:43)
	at 

Does the fix address both of these?

comment #30 For those issues (package fragment is not found and Argument for @NotNull parameter...), the workaround in 4.2 is to put

systemProp.lint.do.not.reuse.uast.env=true

in your gradle.properties file as described in comment #22. Please let me know if it works or not for you.

Marking fixed in AGP 7.0.

That is, the lint.do.not.reuse.uast.env workaround should no longer be needed in AGP 7.0+. And, you should no longer see the following warnings/errors while running Lint:

ERROR: package fragment is not found for module:<lintWithKotlin>...

ERROR: Could not generate LightClass for...

java.lang.IllegalArgumentException: Argument for @NotNull parameter 'descriptor' of org/jetbrains/kotlin/codegen/context/CodegenContext.intoPackagePart must not be null

The issue is fixed due to the new "Lint partial analysis" mode (enabled by default) which creates a standalone UastEnvironment instance for each module, thereby avoiding stale caches in the Kotlin compiler frontend.

Please comment on the bug if you see any similar errors in AGP 7.0+.