Eliminate nullability errors from :runners:direct-java
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core
good first issue
java
P3
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-10518](https://issues.apache.org/jira/browse/BEAM-10518). Original Jira may contain additional context.
Reported by: kenn.
Subtask of issue #20497
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