JMH does not recognise @State annotation on Groovy classes

[Aleksey Shipilev]

Ah, so you are using Groovy Eclipse compiler. This configuration was
never tested, and it is not "officially" supported. Please see how the
Groovy benchmarks bootstrapped from archetypes are working. I see your
original POM was from the archetype, so you must be trying to do
something out of the recommended way, capturing the errors along the way ;)

I traced the error a bit, and can conclude that Element.getAnnotation()
returns null when trying to look up @State on com.test.app.MyBenchmark.
In fact, even getAnnotationMirrors() returns the empty array. Element
implementation is provided by the compiler, and therefore I believe the
problem you are facing is the compiler issue, not the JMH one.

Thanks,
-Aleksey

On 10/19/2015 05:24 PM, Gabor Nagy wrote:
> Hope the attachment goes through.
> 
> Don't scold me if it is something moronic...
> 
> groovy-all 2.4.3
> maven-compiler-plugin 3.1
> groovy-eclipse-compiler 2.9.2-01
> groovy-eclipse-batch
> 
> mvn clean compile
> [INFO] Scanning for projects...
> [INFO]                                                                        
> 
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Building JMH benchmark sample: Groovy 1.0-SNAPSHOT
> [INFO]
> ------------------------------------------------------------------------
> [INFO]
> [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ my-app ---
> [INFO] Deleting /tmp/my-app/my-app/target
> [INFO]
> [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @
> my-app ---
> [INFO] Using 'UTF-8' encoding to copy filtered resources.
> [INFO] skip non existing resourceDirectory
> /tmp/my-app/my-app/src/main/resources
> [INFO] skip non existing resourceDirectory
> /tmp/my-app/my-app/src/main/resources.filtered
> [INFO]
> [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ my-app ---
> [INFO] Changes detected - recompiling the module!
> [INFO] Using Groovy-Eclipse compiler to compile both Java and Groovy files
> [INFO] -------------------------------------------------------------
> [ERROR] COMPILATION ERROR :
> [INFO] -------------------------------------------------------------
> [ERROR]
> /tmp/my-app/my-app/src/main/java/com/test/app/MyBenchmark.groovy:[41,8]
> 1. ERROR in
> /tmp/my-app/my-app/src/main/java/com/test/app/MyBenchmark.groovy (at
> line 41)
>     double something;
>            ^^^^^^^^^
> Field "something" is declared within the class not having @State
> annotation. This can result in unspecified behavior, and prohibited.
> 
> [ERROR] Found 1 error and 0 warnings.
> [INFO] 2 errors
> [INFO] -------------------------------------------------------------
> [INFO]
> ------------------------------------------------------------------------
> [INFO] BUILD FAILURE
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Total time: 2.071 s
> [INFO] Finished at: 2015-10-19T22:19:59+08:00
> [INFO] Final Memory: 13M/163M
> [INFO]
> ------------------------------------------------------------------------
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-compiler-plugin:3.1:compile
> (default-compile) on project my-app: Compilation failure: Compilation
> failure:
> [ERROR]
> /tmp/my-app/my-app/src/main/java/com/test/app/MyBenchmark.groovy:[41,8]
> 1. ERROR in
> /tmp/my-app/my-app/src/main/java/com/test/app/MyBenchmark.groovy (at
> line 41)
> [ERROR] double something;
> [ERROR] ^^^^^^^^^
> [ERROR] Field "something" is declared within the class not having @State
> annotation. This can result in unspecified behavior, and prohibited.
> [ERROR]
> [ERROR] Found 1 error and 0 warnings.