Qute fails to resolve properties on enum classes only when native compiled

[jayv]

Describe the bug

Templates render NOT_FOUND in native mode (works fine on JVM) for enum classes when attempting to access a member field of getter of the enum class.

Expected behavior

Render the member field or method both in JVM as in native mode.

Actual behavior

Qute resolves the property in JVM mode just fine but resolves as NOT_FOUND when compiled to native. Current workaround is to override toString() which is the only way to render an enum it seems.

How to Reproduce?

data class AuthenticatedUser( 
    val roles: Set<Role>
)

enum class Role(val group: String) {
   
    BASIC("SomeBasicGroup"),
    ADMIN("AdminGroup);

    // this is a workaround
    override fun toString(): String { 
        return group
    }
}

            {#for role in user.roles.orEmpty}
                <li>{role.group}</li> 
            {/for}

The above renders NOT_FOUND when native compiled, however when {role} is used it works, so toString() can be called. Adding an other method or getter also results in NOT_FOUND again only when native compiled.

Output of uname -a or ver

quay.io/quarkus/centos-quarkus-maven:21.0-java11

GraalVM version (if different from Java)

quay.io/quarkus/centos-quarkus-maven:21.0-java11

Quarkus version or git rev

1.13.2.Final

Build tool (ie. output of mvnw --version or gradlew --version)

mvn 3.6.2

[quarkus-bot]

/cc @mkouba

[mkouba]

Hi @jayv, this is expected. In the JVM a fallback reflection value resolver is used, i.e. enum constants are read as regular fields. Of course, this does not work for native. There are several ways how to solve the problem for the native image:

1. Make use of type-safe templates or type-safe expressions (preferred); this way a specialized value resolver is generated automatically
2. Annotate the enum class with @TemplateData so that a specialized value resolver is generated
3. Annotate the enum class with @io.quarkus.runtime.annotations.RegisterForReflection to make the reflection value resolver work