pulumi up java.lang.NullPointerException

What happened?

When doing pulumi up exception java.lang.UnsupportedOperationException is being thrown

Example

pulumi up

failed with an unhandled exception:
    java.lang.UnsupportedOperationException: Convert [com.pulumi.aws.alb.TargetGroup.targetHealthStates]: Error converting 'java.util.Collections$UnmodifiableRandomAccessList' to 'TypeShape{type=interface java.util.List, parameters=[TypeShape{type=class com.pulumi.aws.alb.outputs.TargetGroupTargetHealthState, parameters=[]}]}'. null
    	at com.pulumi.serialization.internal.Converter.convertObjectUntyped(Converter.java:119)
    	at com.pulumi.serialization.internal.Converter.convertValue(Converter.java:86)
    	at com.pulumi.core.internal.OutputCompletionSource.setValue(OutputCompletionSource.java:95)
    	at com.pulumi.deployment.internal.DeploymentImpl$ReadOrRegisterResourceInternal.lambda$completeResourceAsync$0(DeploymentImpl.java:1187)
    	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:642)
    	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:479)
    	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
    	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
    	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
    	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
    	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)
    Caused by: java.lang.NullPointerException
    	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:889)
    	at com.google.common.collect.ImmutableList$Builder.add(ImmutableList.java:813)
    	at com.pulumi.serialization.internal.Converter.tryConvertList(Converter.java:642)
    	at com.pulumi.serialization.internal.Converter.tryConvertObjectInner(Converter.java:277)
    	at com.pulumi.serialization.internal.Converter.convertObjectUntyped(Converter.java:115)
    	... 10 more

Output of pulumi about

CLI
Version      3.94.2
Go Version   go1.21.4
Go Compiler  gc

Plugins
NAME  VERSION
java  unknown

Host
OS       darwin
Version  14.0
Arch     x86_64

This project is written in java: executable='/Users/slawek/.sdkman/candidates/java/11.0.2-open/bin/java' version='openjdk 11.0.2 2019-01-15
OpenJDK Runtime Environment 18.9 (build 11.0.2+9)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.2+9, mixed mode)' java='/Users/slawek/.sdkman/candidates/java/11.0.2-open/bin/java' javac='11.0.2' maven='Apache Maven 3.8.6 (84538c9988a25aec085021c365c560670ad80f63)'

Backend
Name         Name
URL            s3://...
User           slawek
Organizations
Token type     personal

Additional context

No response

Contributing

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To contribute a fix for this issue, leave a comment (and link to your pull request, if you've opened one already).

Start with the failing pulumi up reproduction and read com.pulumi.serialization.internal.Converter, especially tryConvertList and convertObjectUntyped, where the stack trace reports the failure. Trace conversion of TargetGroup.targetHealthStates and verify the example no longer throws during resource completion; add or run a focused regression test if the existing test layout identifies one.