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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help wanted

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

Tech stack
javaandroid
Domain
mobileperformance
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.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
blocked
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.
15
Research direction
The NullPointerException occurs in FPSTracer.java at line 289 in doReport, where a null SparseArray is accessed. Investigate the initialization of the SparseArray field in FPSTracer and ensure it is not null when onTimeExpire is called. Look at the LazyScheduler class to understand the scheduling context. The fix likely involves adding a null check or ensuring proper initialization.
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.util.SparseArray.get(int)' on a null object reference · Tencent/matrix#127 | Good First Issue