Tencent/matrix

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.util.SparseArray.get(int)' on a null object reference

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#127 opened on Mar 7, 2019

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Description

03-06 22:32:07.184 330 489 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.util.SparseArray.get(int)' on a null object reference 03-06 22:32:07.184 330 489 E AndroidRuntime: at com.tencent.matrix.trace.tracer.FPSTracer.doReport(FPSTracer.java:289) 03-06 22:32:07.184 330 489 E AndroidRuntime: at com.tencent.matrix.trace.tracer.FPSTracer.onTimeExpire(FPSTracer.java:152) 03-06 22:32:07.184 330 489 E AndroidRuntime: at com.tencent.matrix.trace.schedule.LazyScheduler$RetryRunnable.run(LazyScheduler.java:83) 03-06 22:32:07.184 330 489 E AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:891) 03-06 22:32:07.184 330 489 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102) 03-06 22:32:07.184 330 489 E AndroidRuntime: at android.os.Looper.loop(Looper.java:207) 03-06 22:32:07.184 330 489 E AndroidRuntime: at android.os.HandlerThread.run(HandlerThread.java:65)

Contributor guide

Research direction
Inspect the null SparseArray in FPSTracer.doReport at line 289. Check where mData is initialized or assigned null, and ensure it is not null before calling get().
Tech stack
javaandroid
Domain
mobile
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaAndroid
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70