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Fix TraceStateBuilder.remove corrupting the builder when the same key is removed twice #8613

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Fix TraceStateBuilder.remove corrupting the builder when the same key is removed twice #8613

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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,11 @@

## Unreleased

### API

* Fix `TraceStateBuilder.remove` corrupting the builder when the same key is removed twice
([#8613](https://github.com/open-telemetry/opentelemetry-java/pull/8613))

## Version 1.64.0 (2026-07-10)

### API
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6 changes: 4 additions & 2 deletions api/all/src/main/java/io/opentelemetry/api/trace/ArrayBasedTraceStateBuilder.java
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Expand Up @@ -92,8 +92,10 @@ public TraceStateBuilder remove(String key) {
}
for (int i = 0; i < reversedEntries.size(); i += 2) {
if (reversedEntries.get(i).equals(key)) {
reversedEntries.set(i + 1, null);
numEntries--;
if (reversedEntries.get(i + 1) != null) {
reversedEntries.set(i + 1, null);
numEntries--;
}
return this;
}
}
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28 changes: 28 additions & 0 deletions api/all/src/test/java/io/opentelemetry/api/trace/TraceStateTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,10 @@
class TraceStateTest {
private static final String FIRST_KEY = "key_1";
private static final String SECOND_KEY = "key_2";
private static final String THIRD_KEY = "key_3";
private static final String FIRST_VALUE = "value.1";
private static final String SECOND_VALUE = "value.2";
private static final String THIRD_VALUE = "value.3";

private final TraceState firstTraceState =
TraceState.builder().put(FIRST_KEY, FIRST_VALUE).build();
Expand Down Expand Up @@ -303,6 +305,32 @@ void removeNotPresent() {
.isEqualTo(multiValueTraceState);
}

@Test
void removeTwice() {
assertThat(firstTraceState.toBuilder().remove(FIRST_KEY).remove(FIRST_KEY).build())
.isEqualTo(TraceState.getDefault());
}

@Test
void removeTwice_KeepsRemainingEntry() {
assertThat(multiValueTraceState.toBuilder().remove(FIRST_KEY).remove(FIRST_KEY).build().asMap())
.containsExactly(entry(SECOND_KEY, SECOND_VALUE));
}

@Test
void removeTwice_KeepsRemainingEntries() {
assertThat(
TraceState.builder()
.put(FIRST_KEY, FIRST_VALUE)
.put(SECOND_KEY, SECOND_VALUE)
.put(THIRD_KEY, THIRD_VALUE)
.remove(FIRST_KEY)
.remove(FIRST_KEY)
.build()
.asMap())
.containsExactly(entry(THIRD_KEY, THIRD_VALUE), entry(SECOND_KEY, SECOND_VALUE));
}

@Test
void addAndRemoveEntry() {
assertThat(
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