java.lang.NullPointerException version 1.7.7

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#1,311 opened on Dec 16, 2019 1 comment 0 reactions 0 assignees View on GitHub

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Dominant language: Java
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Description

Attempt to invoke interface method 'com.liulishuo.filedownloader.BaseDownloadTask com.liulishuo.filedownloader.BaseDownloadTask$IRunningTask.P()' on a null object reference

1 com.liulishuo.filedownloader.FileDownloadMessenger.d(FileDownloadMessenger.java:106)
2 com.liulishuo.filedownloader.DownloadTaskHunter.e(DownloadTaskHunter.java:171)
3 com.liulishuo.filedownloader.DownloadTaskHunter.b(DownloadTaskHunter.java:85)
4 com.liulishuo.filedownloader.MessageSnapshotGate.a(MessageSnapshotGate.java:48)
5 com.liulishuo.filedownloader.MessageSnapshotGate.a(MessageSnapshotGate.java:96)
6 com.liulishuo.filedownloader.message.MessageSnapshotThreadPool$FlowSingleExecutor$1.run(MessageSnapshotThreadPool.java:100)
7 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
8 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
9 java.lang.Thread.run(Thread.java:764)

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First steps

Read the whole issue, then the project's contributing guide.
Comment on the issue to say you are picking it up — it saves two people doing the same work.
Fork the repository and make your change on a branch.
Open a pull request that references the issue number.

Research direction

Start at FileDownloadMessenger.java:106 and trace the call chain through DownloadTaskHunter.java:171 and :85, then MessageSnapshotGate.java:48 and :96. Reproduce the reported NullPointerException in version 1.7.7 if possible; done means the failing path is understood and no longer invokes P() on a null object.

Written by the indexing model from the issue text.

Assessment

Tech stack: android, java
Domain: mobile-dev
Issue type: Bug
Difficulty: 4/5
Estimated time: 3-5 days
Activity status: Stale
Clarity: Needs clarification
Newbie friendliness: 25/100