The project originates from inspectit-eum-server. In summary, the server is used to receive data (metrics & traces) collected from browsers and process them as OpenTelemetry-data. This showcase extracts only the part responsible for traces.
The showcase provides one REST endpoint: /spans
It expects to receive span proto data, which will be converted to OpenTelemetry SDK spans. After that, the SDK spans will be exported via OTLP to a collector.
The received span proto data is created by opentelemetry-exporter-trace-otlp-http
More precisely, we use this plugin to generate traces: https://github.com/NovatecConsulting/boomerang-opentelemetry-plugin
There is an example for such data in the test resources.
The test class OtlpGrpcTraceExporterIntTest
tries to send data to the /spans and checks if the expected trace data will be exported by OTLP.
The test verifyTraceWithArrayValueSent() fails with a java.lang.ClassCastException.