landonzeng opened a new issue #5508:
URL: https://github.com/apache/skywalking/issues/5508
Please answer these questions before submitting your issue.
- Why do you submit this issue?
- [ ] Question or discussion
- [*] Bug
- [ ] Requirement
- [ ] Feature or performance improvement
___
### Question
- What do you want to know?
Why will appear this error message
‘‘
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_265],
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
[?:1.8.0_265],
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
[?:1.8.0_265],
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_265],
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
[?:1.8.0_265],
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_265],
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[?:1.8.0_265],
at
org.apache.skywalking.oap.server.core.alarm.provider.AlarmCore.lambda$start$3(AlarmCore.java:77)
~[server-alarm-plugin-8.2.0-SNAPSHOT.jar:8.2.0-SNAPSHOT],
at java.util.ArrayList.forEach(ArrayList.java:1259) ~[?:1.8.0_265],
at
org.apache.skywalking.oap.server.core.alarm.provider.AlarmCore.lambda$null$2(AlarmCore.java:77)
~[server-alarm-plugin-8.2.0-SNAPSHOT.jar:8.2.0-SNAPSHOT],
at
org.apache.skywalking.oap.server.core.alarm.provider.slack.SlackhookCallback.doAlarm(SlackhookCallback.java:66)
~[server-alarm-plugin-8.2.0-SNAPSHOT.jar:8.2.0-SNAPSHOT],
java.lang.NullPointerException: null,
2020-09-17 07:04:21,143 -
org.apache.skywalking.oap.server.core.alarm.provider.AlarmCore -78603097
[pool-2-thread-1] ERROR [] - null
‘’
___
### Bug
- Which version of SkyWalking, OS and JRE?
skywalking 8.x ，linux Centos 7
- Which company or project?
- What happened?
If possible, provide a way to reproduce the error. e.g. demo application,
component version.
___
### Requirement or improvement
- Please describe your requirements or improvement suggestions.
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