[FLINK-9787] Change ExecutionConfig#getGlobalJobParameters to return an instance of GlobalJobParameters instead of null if no custom globalJobParameters are set yet

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.10.0
• Component/s: API / DataStream
• Labels: pull-request-available
• Release Note: The `ExecutionConfig#setGlobalJobParameters` only accepts non null argument values.
• Assignee: Ji Liu
• Reporter: Florian Schmidt
• Created: 10/Jul/18 08:03
• Updated: 30/Aug/19 07:58
• Resolved: 30/Aug/19 07:58

Description

Currently when accessing ExecutionConfig#getGlobalJobParameters this will return `null` if no globalJobParameters are set. This can easily lead to NullPointerExceptions when used with getGlobalJobParameters.toMap()

An easy improvement for this would be to just return a new instance of GlobalJobParameters if none is set with the empty map as the parameters

This would be a breaking change since we expose this via RuntimeContext#getExecutionConfig

Issue Links

• links to: GitHub Pull Request #8175