OtlpJsonLoggingSpanExporter doesn't respect the File Exporter format

[joffrey-bion]

Describe the bug

The log files produced by OtlpJsonLoggingSpanExporter contain JSON lines, but each line is missing the { "resourceSpans": [ ... ] } wrapper described here:
https://opentelemetry.io/docs/specs/otel/protocol/file-exporter/#examples

Steps to reproduce

Use this kind of configuration:

val tracerProvider = SdkTracerProvider.builder()
    .addSpanProcessor(BatchSpanProcessor.builder(OtlpJsonLoggingSpanExporter.create()).build())
    .setResource(resource)
    .build()
val openTelemetry = OpenTelemetrySdk.builder()
    .setTracerProvider(tracerProvider)
    .build()
GlobalOpenTelemetry.set(openTelemetry)

// Configure the output log file
val otlpLogger = Logger.getLogger(OtlpJsonLoggingSpanExporter::class.java.getName())
val spansFile = amperBuildLogsRoot.path.resolve("opentelemetry_traces.jsonl")
val fileHandler = FileHandler(spansFile.pathString, true) // true to append, false to overwrite
fileHandler.formatter = MessageOnlyFormatter
otlpLogger.addHandler(fileHandler)
otlpLogger.level = Level.ALL

// A simple formatter to avoid the usual logging makeup in the file and keep the pure JSON lines output
private object MessageOnlyFormatter : Formatter() {
    override fun format(record: LogRecord?): String = formatMessage(record) + "\n"
}

And check the output files after producing some spans.

What did you expect to see?

A file that looks like the examples in the specification:

{"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000000123","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000000123","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":4},{"traceId":"","spanId":"","droppedAttributesCount":1}],"droppedLinksCount":3,"status":{}}]}]}]}
{"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000000424","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000000424","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000000343","endTimeUnixNano":"1581452773000001089","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":3},{"traceId":"","spanId":"","droppedAttributesCount":4}],"droppedLinksCount":2,"status":{}}]}]}]}
{"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000000826","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000000826","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000200521","endTimeUnixNano":"1581452773000004789","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":5},{"traceId":"","spanId":"","droppedAttributesCount":2}],"droppedLinksCount":3,"status":{}}]}]}]}
{"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000010925","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000010925","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000011821","endTimeUnixNano":"1581452772000012924","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":2},{"traceId":"","spanId":"","droppedAttributesCount":2}],"droppedLinksCount":5,"status":{}}]}]}]}

What did you see instead?

A file containing directly the object with the "resource" key on each line:

{"resource":{"attributes":[{"key":"host.arch","value":{"stringValue":"amd64"}},{"key":"os.type","value":{"stringValue":"Windows 11"}},{"key":"os.version","value":{"stringValue":"10.0"}},{"key":"service.instance.id","value":{"stringValue":"2024-09-26T05:51:29.916535600Z"}},{"key":"service.name","value":{"stringValue":"Amper"}},{"key":"service.namespace","value":{"stringValue":"amper"}},{"key":"service.version","value":{"stringValue":"1.0-SNAPSHOT"}}]},"scopeSpans":[{"scope":{"name":"amper","attributes":[]},"spans":[{"traceId":"b1855bb06a23ac1d3e2fb281f8404ab1","spanId":"9273867f9fa35ca0","parentSpanId":"d3313fa66a173288","name":"CLI Setup: install coroutines debug probes","kind":1,"startTimeUnixNano":"1727329890251787700","endTimeUnixNano":"1727329890553119400","attributes":[],"events":[],"links":[],"status":{},"flags":257},{"traceId":"d5cedbb6b980918d6f63fbece1de512f","spanId":"d7fb358e2f168f8c","parentSpanId":"74fe0d3e6f3de8ee","name":"Init mock IntelliJ 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What version and what artifacts are you using?
Artifacts:

opentelemetry-api
opentelemetry-exporterLoggingOtlp
opentelemetry-kotlin
opentelemetry-sdk
opentelemetry-sdkTrace

Version: 1.42.1

How did you reference these artifacts? (excerpt from your build.gradle, pom.xml, etc) My Gradle catalog:

opentelemetry-api = { module = "io.opentelemetry:opentelemetry-api", version.ref = "opentelemetry" }
opentelemetry-exporterLoggingOtlp = { module = "io.opentelemetry:opentelemetry-exporter-logging-otlp", version.ref = "opentelemetry" }
opentelemetry-kotlin = { module = "io.opentelemetry:opentelemetry-extension-kotlin", version.ref = "opentelemetry" }
opentelemetry-sdk = { module = "io.opentelemetry:opentelemetry-sdk", version.ref = "opentelemetry" }
opentelemetry-sdkTrace = { module = "io.opentelemetry:opentelemetry-sdk-trace", version.ref = "opentelemetry" }

Environment
Compiler: Corretto 21
OS: Windows

Additional context
This is a CLI application exporting telemetry in log files (for which JSON lines are important), and visualization is done in Jaeger UI after the fact.

[shalk]

I think OtlpJsonLoggingSpanExporter is not relate with the File Exporter in Specification.

1. OtlpJsonLoggingSpanExporter is a exporter only in opentelemetry-java, it is Logs span to JUL in the OTLP JSON encoding. class OtlpJsonLoggingSpanExporter which type is logging-otlp is intend to generate json without "resourceSpans" outside it. see the unit test https://github.com/open-telemetry/opentelemetry-java/blob/main/exporters/logging-otlp/src/test/java/io/opentelemetry/exporter/logging/otlp/OtlpJsonLoggingSpanExporterTest.java#L111

2. File Exporter is implemented by other repository https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/exporter/fileexporter

[joffrey-bion]

Thanks for the explanation. Is there an alternative in opentelemetry-java to write traces to a FileExporter-compliant JSON lines file?

I'm writing a JVM-based CLI application and would like to append spans to a JSON lines file for consumption with local tools (like Jaeger UI).

[shalk]

I do not found an alternative. maybe you can implement a exporter or setup a collector

[cyrille-leclerc]

I face the same problem with logs emitted by the logging-otlp. They lack the {"resourceLogs": [...]} parent element and thus don't comply with the otlpjson Connector of the OTel Collector.
cc @zeitlinger

[zeitlinger]

Please use this as logs exporter

https://github.com/open-telemetry/opentelemetry-java/pull/6675/files#diff-32896918b1855d337a090830066d5379b2422e5f5bed82a3485e42a04ef9decbR27

[jack-berg]

Closing as this is resolved with the new OTLP stdout exporters: OtlpStdoutLogRecordExporter, OtlpStdoutSpanExporter, OtlpStdoutMetricExporter

Available for reference in OTEL_{SIGNAL}_EXPORTER via experimental-otlp/stdout.

[joffrey-bion]

Apparently the OtlpStdoutSpanExporter doesn't generate separate lines for each JSON object. So I get this error when importing in Jaeger UI:

Error parsing JSON at line 1: Unexpected non-whitespace character after JSON at position 62519 (line 1 column 62520)

Basically, the file looks like this:

{"resourceSpans":[...]}{"resourceSpans":[...]}

Instead of:

{"resourceSpans":[...]}
{"resourceSpans":[...]}

[cyrille-leclerc]

@joffrey-bion, I faced the same problem with resourceLogs and reported it as:

• ResourceLogs emitted by experimental-otlp/stdout lack line breaks being incompatible with the OTelCol otlpjson connector #6836

I think @zeitlinger fixed this in

• bugfix: add newline in stdout exporter #6848

@zeitlinger 's PR is merged and should be released in otel-java v1.44.0 something like next week and soon after in the otel-java-instrumentation agent v2.10.0.