genericVariable missing from payload doesn’t default to empty string #380
Description
Jenkins and plugins versions report
Summary
In a Declarative Pipeline, when a genericVariable is not present in the incoming payload, it does not implicitly default to an empty string. As a result, a regexpFilterExpression that expects an empty string doesn’t match and the job isn’t triggered.
If I explicitly set defaultValue: '' for that variable, the job triggers as expected.
Steps to reproduce
- Configure a Declarative Pipeline with a GenericTrigger that defines a genericVariable extracted from the payload, and use that variable in regexpFilterText
- Ensure the webhook payload omits the JSONPath field entirely
- Use a regexpFilterExpression that matches an empty string (e.g. ^$)
- Send the webhook
Expected
When the JSONPath value is missing, the variable should evaluate to an empty string, the regexpFilterExpression: '^$' should match and job triggers
Actual
The job does not trigger unless I explicitly set defaultValue: '' for the genericVariable.
Minimal example
Not working
triggers{
GenericTrigger(
genericVariables: [
[key: 'PR_COMMENT', value: '$.comment'],
],
regexpFilterText: '$PR_COMMENT',
regexpFilterExpression: '^$'
)
}
Working
triggers{
GenericTrigger(
genericVariables: [
[key: 'PR_COMMENT', value: '$.comment', defaultValue: ''],
],
regexpFilterText: '$PR_COMMENT',
regexpFilterExpression: '^$'
)
}
Environment
Jenkins: 2.492.3.5
OS: Linux - 5.10.236-227.928.amzn2.aarch64
Java: 21.0.6 - Red Hat, Inc. (OpenJDK 64-Bit Server VM)
ace-editor:1.1
ant:513.vde9e7b_a_0da_0f
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apache-httpcomponents-client-4-api:4.5.14-269.vfa_2321039a_83
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