facebook/fresco

Fatal Exception: java.lang.NullPointerException: Attempt to get length of null array

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#2,504 建立於 2020年5月26日

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 (15 留言) (0 反應) (0 負責人)Java (17,072 star) (3,750 fork)batch import
buggood first issuehelp wanted

描述

We are getting following crash on Crashlytics for good number of users with Android OS 8, with more than 47 devices. We are using "com.facebook.fresco:fresco:2.2.0"

Could you please help us, since its happening on. multiple users.

Logs :

Fatal Exception: java.lang.NullPointerException: Attempt to get length of null array at java.util.Formatter$FormatSpecifier.addZeros(Formatter.java:3505) at java.util.Formatter$FormatSpecifier.print(Formatter.java:3401) at java.util.Formatter$FormatSpecifier.print(Formatter.java:3332) at java.util.Formatter$FormatSpecifier.print(Formatter.java:3317) at java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2891) at java.util.Formatter$FormatSpecifier.print(Formatter.java:2844) at java.util.Formatter.format(Formatter.java:2523) at java.util.Formatter.format(Formatter.java:2458) at java.lang.String.format(String.java:2814) at com.facebook.common.logging.FLog.formatString(FLog.java:491) at com.facebook.common.logging.FLog.v(FLog.java:118) at com.facebook.imagepipeline.transcoder.DownsampleUtil.determineDownsampleRatio(DownsampleUtil.java:87) at com.facebook.imagepipeline.transcoder.DownsampleUtil.determineSampleSize(DownsampleUtil.java:43) at com.facebook.imagepipeline.producers.DecodeProducer$ProgressiveDecoder$1.run(DecodeProducer.java:163) at com.facebook.imagepipeline.producers.JobScheduler.doJob(JobScheduler.java:202) at com.facebook.imagepipeline.producers.JobScheduler.access$000(JobScheduler.java:22) at com.facebook.imagepipeline.producers.JobScheduler$1.run(JobScheduler.java:73) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636) at com.facebook.imagepipeline.core.PriorityThreadFactory$1.run(PriorityThreadFactory.java:51) at java.lang.Thread.run(Thread.java:764)

貢獻者指南

技術棧
java
領域
mobile
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
half day
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
needs investigation
前置要求
basic JavaAndroid logging
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
30
研究方向
The stack trace points to a NullPointerException in `java.util.Formatter$FormatSpecifier.addZeros` called from `FLog.formatString` at line 491. The crash occurs in `DownsampleUtil.determineDownsampleRatio` (line 87) and `DecodeProducer$ProgressiveDecoder$1.run` (line 163). Investigate the `FLog.formatString` method in the Fresco codebase to identify why a null array is passed to `String.format`. Check if there is a missing null check for the format arguments. Additionally, review the `DownsampleUtil` class to understand the context in which the logging is invoked. The issue is reproducible on Android 8 across many devices; consider testing with an emulator running API 26. Look at the existing comments in issue #2504 for any further hints from maintainers.