[jira] [Created] (BEAM-8785) Default value for enum runtime option doesn't work

["Yura Atamanchuk (Jira)" <ji...@apache.org>]

Yura Atamanchuk created BEAM-8785:
-------------------------------------

             Summary: 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
    Affects Versions: 2.15.0
            Reporter: Yura Atamanchuk


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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