Custom Exporter | Now able to integrate custom exporter writing in java-sdk with java-instrumentation

[NikunjPatel31]

I want to write all the traces into file before they are send to collector. For this I made necessary changes in **OtlpHttpSpanExporter -> export** method in Opentelemetry-java ( https://github.com/open-telemetry/opentelemetry-java ) . Below is the code of export method.

@Override
  public CompletableResultCode export(Collection<SpanData> spans) {
    String path = "/home/demo/testing.txt";
    try (BufferedWriter writer = Files.newBufferedWriter(Paths.get(path), UTF_8)) {
      writer.write("This is testing of opentelemetry");
      writer.flush();
    } catch (IOException e) {
      return marshaler.export(spans);
    }
    return marshaler.export(spans);
  }

Now I am running gradle build -x test --warning-mode all command to create .jar file. Once this jar file is generated I am add this jar to project settings -> Libraries -> New Project Library from intellij. Then I am generating .jar file of agent by running following command gradle build -x test --warning-mode all. Once this .jar file is generated I am using this .jar file to bind it with my application.

Now whenever I am trying to generate trace, file is not getting created. I am able to see the traces at jaejar but file is not getting generated.

I have tried to replace the .jar file from .m2/ directory but still the result is same.

Please let me know what I am doing wrong.

[ashish159357]

facing same issue. don't know how to do changes in sdk and then use it in java-instrumentation

[trask]

If you're asking how to customize the SDK inside of the Java agent, check out https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/examples/extension#extensions

[HarshMehta112]

I'm struggling with modifying the SDK and applying some changes in Java instrumentation. I'm not sure how to go about it.