Java 11 project, unable to migrate from 0.9.1 to 0.16.0

[rchapin]

I have a Java 11 maven project in which I wrote a custom MetricExporter against the io.opentelemetry.sdk.metrics.export.MetricExporter interface.

Previously, the dependencies in my pom were as follows

<dependency>
  <groupId>io.opentelemetry</groupId>
  <artifactId>opentelemetry-sdk</artifactId>
  <version>${opentelemetry.version}</version>
</dependency>

<dependency>
  <groupId>io.opentelemetry</groupId>
  <artifactId>opentelemetry-api</artifactId>
  <version>${opentelemetry.version}</version>
</dependency>

<dependency>
  <groupId>io.opentelemetry</groupId>
  <artifactId>opentelemetry-context-prop</artifactId>
  <version>${opentelemetry.version}</version>
</dependency>

My module-info.java entries were

requires transitive io.opentelemetry.api;
requires transitive io.opentelemetry.sdk.common;
requires transitive io.opentelemetry.sdk.metrics;

I updated the dependencies in the pom to

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>io.opentelemetry</groupId>
      <artifactId>opentelemetry-bom</artifactId>
      <version>${opentelemetry.version}</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependency>
  <groupId>io.opentelemetry</groupId>
  <artifactId>opentelemetry-sdk</artifactId>
  <version>${opentelemetry.version}</version>
</dependency>

<dependency>
  <groupId>io.opentelemetry</groupId>
  <artifactId>opentelemetry-api</artifactId>
  <version>${opentelemetry.version}</version>
</dependency>

After attempting to upgrade to 0.16.0 I can no longer resolve any of imports from the io.opentelemetry.sdk.metrics package or any of it's child packages. I am unable to add the aforementioned package to my list of required modules and as a result cannot compile the program.

The list of modules output by the following command is identical between version 0.9.1 and 0.16.0.

$ jar --file=./opentelemetry-sdk-0.16.0.jar --describe-module
No module descriptor found. Derived automatic module.

io.opentelemetry.sdk@0.16.0 automatic
requires java.base mandated
contains io.opentelemetry.sdk

Any help would be greatly appreciated.

[anuraaga]

Hi @rchapin - sorry for the troubles. We've made many breaking changes since then, including separating metrics out to a separate artifact since it's not stable yet. You probably need to add the opentelemetry-sdk-metrics artifact to your build to get it back at the least.

To be honest, we'll probably continue to make significant breaks for a few months so I'd recommend a different metrics mechanism for now if it's hard to keep up with our releases.

[jkwatson]

If you're interested in this, I recommend joining the opentelemetry specification metrics working groups, where work is ongoing to define metrics data models and APIs. Putting issues into this repository would probably be premature, until the specifications are complete.

[rchapin]

OK, thanks. Once I get this project off my plate I will see if I have the cycles. Thanks again for your help.

[anuraaga]

Thanks for the understanding @rchapin! Hoping we get to a more stable state soon so you can try it out again.

[rchapin]

@anuraaga no problem whatsoever. I'm hoping that I can get a chance to contribute to the project. :) I posted a question about the API feature that I mentioned into the metrics specs discussion at gitter; we will see what everyone has to say.

[jkwatson]

Just FYI, the entire project is in the process of moving off of gitter and onto github discussions and CNCF slack. You might get more traction by creating a Discussion in the opentelemetry-specification repository, or in the #otel-specification channel on CNCF slack. (It's honestly hard to know where people are going to see things, but gitter is the least likely, I think).