Fatal Exception: java.lang.NullPointerException: Attempt to get length of null array · facebook/fresco#2504

(15 评论) (0 反应) (0 负责人)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)

贡献者指南

技术栈: java
领域: mobile
议题类型: bug
难度: 3
预计时间: half day
活动状态: stale
清晰度: needs investigation
前置要求: basic JavaAndroid logging
新手友好度: 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.