Dropwizard JmxReporter sends gauge metrics as java.lang.Object instead of numerc type

[Hans Holzbart]

I use dropwizard and JMX to report some metrics to our monitoring service (introscope). The underlying metrics object is a Double, 

but the "Value" attribute showed by Java Monitoring & Management Console for this bean is a java.lang.Object. Introscope needs numeric values 

in order to build a graph an cannot do that with java.lang.Object.

Is there a way to let dropwizard send values as Doubles?

pom.xml

<properties>
  <metrics.core.version>3.1.2</metrics.core.version>
  <hystrix.codahale.metrics.publisher.version>1.5.6</hystrix.codahale.metrics.publisher.version>
</properties>

<dependency>
  <groupId>io.dropwizard.metrics</groupId>
  <artifactId>metrics-core</artifactId>
  <version>${metrics.core.version}</version>
</dependency>
<dependency>
  <groupId>com.netflix.hystrix</groupId>
  <artifactId>hystrix-codahale-metrics-publisher</artifactId>
  <version>${hystrix.codahale.metrics.publisher.version}</version>
  <exclusions>
    <exclusion>
      <groupId>com.codahale.metrics</groupId>
      <artifactId>metrics-core</artifactId>
    </exclusion>
  </exclusions>
</dependency>

ReportsConfig.java

import com.codahale.metrics.JmxReporter;
import com.codahale.metrics.MetricRegistry;

@Configuration
public class ReportsConfig {

  @Bean
  public MetricRegistry metricRegistry() {
    return new MetricRegistry();
  }
 
  @Bean
  public JmxReporter jmxReporter(final MetricRegistry metricRegistry) {
    JmxReporter reporter = JmxReporter.forRegistry(metricRegistry).build();
    reporter.start();
    return reporter;
  }
}