Complex attribute export exception

[cleverchuk]

Describe the bug

Adding a complex attribute as spanBuilder.setAttribute(valueKey("one"), Value.of(1)) results in below exception stacktrace

[otel.javaagent 2026-03-18 16:33:55:508 -0400] [BatchSpanProcessor_WorkerThread-1] WARN io.opentelemetry.sdk.trace.export.BatchSpanProcessor - Exporter threw an Exception
java.lang.ClassCastException: class io.opentelemetry.api.common.ValueLong cannot be cast to class io.opentelemetry.javaagent.shaded.io.opentelemetry.api.common.Value (io.opentelemetry.api.common.ValueLong is in unnamed module of loader 'app'; io.opentelemetry.javaagent.shaded.io.opentelemetry.api.common.Value is in unnamed module of loader 'bootstrap')
	at io.opentelemetry.exporter.internal.otlp.AttributeKeyValueStatelessMarshaler$ValueStatelessMarshaler.getBinarySerializedSize(AttributeKeyValueStatelessMarshaler.java:105)
	at io.opentelemetry.exporter.internal.otlp.AttributeKeyValueStatelessMarshaler$ValueStatelessMarshaler.getBinarySerializedSize(AttributeKeyValueStatelessMarshaler.java:72)
	at io.opentelemetry.exporter.internal.marshal.StatelessMarshalerUtil.sizeMessageWithContext(StatelessMarshalerUtil.java:294)
	at io.opentelemetry.exporter.internal.otlp.AttributeKeyValueStatelessMarshaler.getBinarySerializedSize(AttributeKeyValueStatelessMarshaler.java:66)
	at io.opentelemetry.exporter.internal.otlp.AttributeKeyValueStatelessMarshaler.getBinarySerializedSize(AttributeKeyValueStatelessMarshaler.java:28)
	at io.opentelemetry.exporter.internal.marshal.StatelessMarshalerUtil$RepeatedElementPairSizeCalculator.accept(StatelessMarshalerUtil.java:262)
	at java.base/java.util.HashMap.forEach(HashMap.java:1430)
	at io.opentelemetry.sdk.common.internal.AttributesMap.forEach(AttributesMap.java:109)
	at io.opentelemetry.exporter.internal.marshal.StatelessMarshalerUtil.sizeRepeatedMessageWithContext(StatelessMarshalerUtil.java:209)
	at io.opentelemetry.exporter.internal.otlp.traces.SpanStatelessMarshaler.getBinarySerializedSize(SpanStatelessMarshaler.java:93)
	at io.opentelemetry.exporter.internal.otlp.traces.SpanStatelessMarshaler.getBinarySerializedSize(SpanStatelessMarshaler.java:22)
	at io.opentelemetry.exporter.internal.marshal.StatelessMarshalerUtil.sizeRepeatedMessageWithContext(StatelessMarshalerUtil.java:134)
	at io.opentelemetry.exporter.internal.otlp.traces.InstrumentationScopeSpansStatelessMarshaler.getBinarySerializedSize(InstrumentationScopeSpansStatelessMarshaler.java:57)
	at io.opentelemetry.exporter.internal.otlp.traces.InstrumentationScopeSpansStatelessMarshaler.getBinarySerializedSize(InstrumentationScopeSpansStatelessMarshaler.java:21)
	at io.opentelemetry.exporter.internal.marshal.StatelessMarshalerUtil$RepeatedElementPairSizeCalculator.accept(StatelessMarshalerUtil.java:262)
	at java.base/java.util.IdentityHashMap.forEach(IdentityHashMap.java:1376)
	at io.opentelemetry.exporter.internal.marshal.StatelessMarshalerUtil.sizeRepeatedMessageWithContext(StatelessMarshalerUtil.java:187)
	at io.opentelemetry.exporter.internal.otlp.traces.ResourceSpansStatelessMarshaler.getBinarySerializedSize(ResourceSpansStatelessMarshaler.java:69)
	at io.opentelemetry.exporter.internal.otlp.traces.ResourceSpansStatelessMarshaler.getBinarySerializedSize(ResourceSpansStatelessMarshaler.java:28)
	at io.opentelemetry.exporter.internal.marshal.StatelessMarshalerUtil$RepeatedElementPairSizeCalculator.accept(StatelessMarshalerUtil.java:262)
	at java.base/java.util.IdentityHashMap.forEach(IdentityHashMap.java:1376)
	at io.opentelemetry.exporter.internal.marshal.StatelessMarshalerUtil.sizeRepeatedMessageWithContext(StatelessMarshalerUtil.java:187)
	at io.opentelemetry.exporter.internal.otlp.traces.LowAllocationTraceRequestMarshaler.calculateSize(LowAllocationTraceRequestMarshaler.java:84)
	at io.opentelemetry.exporter.internal.otlp.traces.LowAllocationTraceRequestMarshaler.initialize(LowAllocationTraceRequestMarshaler.java:57)
	at io.opentelemetry.exporter.internal.otlp.traces.SpanReusableDataMarshaler.export(SpanReusableDataMarshaler.java:46)
	at io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter.export(OtlpGrpcSpanExporter.java:73)
	at io.opentelemetry.sdk.trace.export.BatchSpanProcessor$Worker.exportCurrentBatch(BatchSpanProcessor.java:320)
	at io.opentelemetry.sdk.trace.export.BatchSpanProcessor$Worker.run(BatchSpanProcessor.java:233)
	at java.base/java.lang.Thread.run(Thread.java:1474)

This happens with any of the Value.of() api. Are these values only expected to be set by instrumentation and not from application code?

Steps to reproduce

Add below code to an app instrumented with the agent

val span = GlobalOpenTelemetry.get().getTracer("my-scope")
            .spanBuilder("my-span")
            .setAttribute(valueKey("one"), Value.of(1))
            .startSpan()

span.end()

Expected behavior

No exception and spans exported

Actual behavior

Exception and span not exported

Javaagent or library instrumentation version

v2.25.0

Environment

JDK: 25
OS: 24.6.0 Darwin Kernel Version 24.6.0

Additional context

No response

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