fix(android): Prevent breadcrumb loss from numeric timestamp ClassCastException#6308
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…tException The JS SDK stamps `breadcrumb.timestamp` as a number (epoch seconds), which arrives over the bridge as a `Double`. Since 8.14.0 (#6261) the native `Breadcrumb.Deserializer` reads `timestamp` as an ISO-8601 string and threw a `ClassCastException`, discarding every synced breadcrumb on Android so native crash reports lost breadcrumb context. Normalize a numeric `timestamp` to an ISO-8601 string before deserializing. Fixes #6306 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Semver Impact of This PR⚪ None (no version bump detected) 📋 Changelog PreviewThis is how your changes will appear in the changelog.
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antonis
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Jun 17, 2026
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10 tasks
📲 Install BuildsAndroid
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Android (legacy) Performance metrics 🚀
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| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| 4e0ba9c+dirty | 452.84 ms | 473.36 ms | 20.52 ms |
| 5748023+dirty | 446.69 ms | 505.63 ms | 58.94 ms |
| bc0d8cf+dirty | 412.37 ms | 466.26 ms | 53.89 ms |
| 3817909+dirty | 406.67 ms | 416.58 ms | 9.91 ms |
| 0bd8916+dirty | 412.77 ms | 451.31 ms | 38.54 ms |
| 68672fc+dirty | 425.02 ms | 487.56 ms | 62.54 ms |
| 2c735cc+dirty | 414.09 ms | 438.47 ms | 24.38 ms |
| 6176a94+dirty | 410.90 ms | 452.20 ms | 41.31 ms |
| 37a2091+dirty | 407.82 ms | 441.22 ms | 33.40 ms |
| 5a21b51+dirty | 471.42 ms | 524.22 ms | 52.80 ms |
App size
| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| 4e0ba9c+dirty | 48.30 MiB | 53.49 MiB | 5.19 MiB |
| 5748023+dirty | 48.30 MiB | 53.54 MiB | 5.23 MiB |
| bc0d8cf+dirty | 48.30 MiB | 53.48 MiB | 5.18 MiB |
| 3817909+dirty | 43.75 MiB | 48.08 MiB | 4.33 MiB |
| 0bd8916+dirty | 48.30 MiB | 53.57 MiB | 5.26 MiB |
| 68672fc+dirty | 48.30 MiB | 53.61 MiB | 5.31 MiB |
| 2c735cc+dirty | 43.75 MiB | 48.08 MiB | 4.33 MiB |
| 6176a94+dirty | 48.30 MiB | 53.54 MiB | 5.24 MiB |
| 37a2091+dirty | 48.30 MiB | 53.58 MiB | 5.28 MiB |
| 5a21b51+dirty | 48.30 MiB | 53.49 MiB | 5.19 MiB |
Contributor
Android (new) Performance metrics 🚀
|
| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| 4e0ba9c+dirty | 421.39 ms | 455.80 ms | 34.41 ms |
| 5748023+dirty | 413.71 ms | 468.71 ms | 54.99 ms |
| 890d145+dirty | 486.42 ms | 514.85 ms | 28.43 ms |
| 0bd8916+dirty | 400.15 ms | 442.72 ms | 42.57 ms |
| 68672fc+dirty | 407.55 ms | 442.96 ms | 35.41 ms |
| 6176a94+dirty | 403.58 ms | 446.73 ms | 43.15 ms |
| 37a2091+dirty | 429.71 ms | 477.00 ms | 47.29 ms |
| 5a21b51+dirty | 505.16 ms | 539.20 ms | 34.04 ms |
| bc0d8cf+dirty | 407.66 ms | 461.35 ms | 53.69 ms |
| c823bb5+dirty | 468.26 ms | 516.16 ms | 47.90 ms |
App size
| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| 4e0ba9c+dirty | 48.30 MiB | 53.49 MiB | 5.19 MiB |
| 5748023+dirty | 48.30 MiB | 53.54 MiB | 5.23 MiB |
| 890d145+dirty | 43.94 MiB | 49.00 MiB | 5.06 MiB |
| 0bd8916+dirty | 48.30 MiB | 53.57 MiB | 5.26 MiB |
| 68672fc+dirty | 48.30 MiB | 53.61 MiB | 5.31 MiB |
| 6176a94+dirty | 48.30 MiB | 53.54 MiB | 5.24 MiB |
| 37a2091+dirty | 48.30 MiB | 53.58 MiB | 5.28 MiB |
| 5a21b51+dirty | 48.30 MiB | 53.49 MiB | 5.19 MiB |
| bc0d8cf+dirty | 48.30 MiB | 53.48 MiB | 5.18 MiB |
| c823bb5+dirty | 48.30 MiB | 53.58 MiB | 5.28 MiB |
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Thanks for the fix! 🚀 |
3 tasks
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📢 Type of change
📜 Description
On Android, every breadcrumb synced from JS to the native scope was being discarded since
8.14.0.The JS SDK stamps
breadcrumb.timestampas a number (epoch seconds), which arrives over the bridge as ajava.lang.Double. Since #6261,RNSentryBreadcrumb.fromMapfeeds the map to the nativeBreadcrumb.Deserializer, which readstimestampviaMapObjectReader.nextDateOrNull→nextStringOrNulland requires an ISO-8601 string. ADoublethrowsClassCastException, the breadcrumb is dropped, and an empty fallback (onlyorigin = "react-native") is returned — so native/tombstone crash reports lose breadcrumb context.This PR normalizes a numeric
timestampto an ISO-8601 string before deserializing, preserving millisecond precision. Existing behavior is unchanged for ISO-string and missing timestamps. iOS is unaffected (Cocoa'sinitWithDictionary:is lenient).💡 Motivation and Context
Fixes #6306. Regression introduced in
8.14.0by #6261 ("Use native SDK deserializers for User and Breadcrumb").💚 How did you test it?
Added
RNSentryBreadcrumbTest.parsesNumericTimestampWithoutDiscardingBreadcrumb, which feeds a numeric timestamp and asserts the breadcrumb survives with its fields and correct timestamp. Verified it fails (messageisnull) without the fix and passes with it. Full Android unit suite green.📝 Checklist
sendDefaultPIIis enabled🔮 Next steps
A follow-up PR will fix a separate, pre-existing issue surfaced during this investigation: user
geois JSON-stringified before crossing the bridge, so the native deserializer drops it (and on Android, the whole user). That fix touches the JS layer and coordinates with #6289.