Eliminate nullability errors from :sdks:java:extensions:sorter
Open
extensions
good first issue
java
P3
sorter
sub-task
- Dominant language
- Java
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Description
Just edit `build.gradle` and set `enableChecker: true` and fix some errors!
Imported from Jira [BEAM-10561](https://issues.apache.org/jira/browse/BEAM-10561). Original Jira may contain additional context.
Reported by: kenn.
Subtask of issue #20497
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