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https://issues.apache.org/jira/browse/BEAM-8785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeff Webb updated BEAM-8785:
----------------------------
Resolution: Won't Fix
Status: Resolved (was: Triage Needed)
resolving as stale issue
> Default value for enum runtime option doesn't work
> --------------------------------------------------
>
> Key: BEAM-8785
> URL: https://issues.apache.org/jira/browse/BEAM-8785
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Yura Atamanchuk
> Priority: P3
> Labels: Clarified
>
> Combination of ValueProvider, enums, @Default and missing option throws
> exception.
> It can be reproduced with:
> ```
> public enum E \{ A }
> public interface Options extends PipelineOptions {
> @Default.Enum("A")
> ValueProvider<E> getE();
> void setE(ValueProvider<E> e);
> }
> public static void main(String[] args) {
> Options options =
> PipelineOptionsFactory.fromArgs("").withValidation().as(Options.class);
> options.getE().get();
> }
> ```
> Which fails with exception:
> ```
> Exception in thread "main" java.lang.IllegalArgumentException:
> org.apache.beam.sdk.options.ValueProvider is not an enum typeException in
> thread "main" java.lang.IllegalArgumentException:
> org.apache.beam.sdk.options.ValueProvider is not an enum type at
> java.lang.Class.enumConstantDirectory(Class.java:3344) at
> java.lang.Enum.valueOf(Enum.java:232) at
> org.apache.beam.sdk.options.ProxyInvocationHandler.returnDefaultHelper(ProxyInvocationHandler.java:587)
> at
> org.apache.beam.sdk.options.ProxyInvocationHandler.getDefault(ProxyInvocationHandler.java:533)
> at
> org.apache.beam.sdk.options.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:158)
> ```
> It seems like to get enum class of a value getter return type is directly
> casted into Class<Enum>, though in this case it is
> Class<ValueProvider<Enum>>. Probably it can be fixed - method return generic
> type is accessible via reflection
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