Issue
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You are facing issues seeing or parsing the workspace folder name when concurrent builds are enabled and the workspace name contains the "@" character.
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You need to change this "@" separator character for your workspace folder to a different one.
Environment
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CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
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CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
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CloudBees CI (CloudBees Core) on traditional platforms - Client controller
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CloudBees CI (CloudBees Core) on traditional platforms - Operations Center
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CloudBees Jenkins Enterprise
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CloudBees Jenkins Enterprise - Managed controller
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CloudBees Jenkins Enterprise - Operations center
Resolution
System properties are defined by passing -Dproperty=value to the java command line to start Jenkins. This separator character on the workspace folder name is defined by the hudson.slaves.WorkspaceList property, that by default is set to @.
Please refer to the "Usage" section on this article to see how to apply these properties. See the below example:
java -Dhudson.slaves.WorkspaceList=newCharacter -jar jenkins.war
Please also make sure to pass all of these arguments before the -jar argument, otherwise they will be ignored.
References
How to add Java arguments to Jenkins? and just mention the property