While submitting Java jobs to Spark Jobserver, it shows JOB Loading Error

[rayabhisek22]

Used Spark version
2.4.7
Used Spark Job Server version
0.8.0 (release version)
Deployed mode
EMR

Actual (wrong) behavior
While submitting Java jobs to Spark Jobserver, it shows JOB Loading Error
Steps to reproduce

Logs
"status": "JOB LOADING FAILED",
"result": {
"message": "com.sample.wordcount.SparkJavaJob cannot be cast to spark.jobser ver.api.SparkJobBase",
"errorClass": "java.lang.ClassCastException",

My code
package com.sample.wordcount;

import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
import org.apache.spark.api.java.JavaSparkContext;
import spark.jobserver.japi.JSparkJob;
import spark.jobserver.api.JobEnvironment;

public class SparkJavaJob implements JSparkJob {

@Override
public Object run(Object sc, JobEnvironment runtime, Config data) {
    return "OK";
}

@Override
public Config verify(Object sc, JobEnvironment runtime, Config config) {
    return ConfigFactory.empty();
}

}

[murraytodd]

I'm seeing a similar issue, but I'm using the most current SJS version 0.11.1.
I'm noticing that if I go to https://sparkjobserver.jfrog.io/ui/packages I see that there are only some packages for 0.11.0 compiled against 2.12.

Is there any chance that a bunch of our SJS releases got dropped from the JFrog resolver?