How to access global variables inside groovy class files? - jenkins

Question

I have the following directory structure
(root)
+- src # Groovy source files
| +- org
| +- foo
| +- Bar.groovy # for org.foo.Bar class
+- vars
| +- foo.groovy # for global 'foo' variable
And I have the following lines of code in the following files
Bar.groovy
package org.foo
class Bar implements Serializable {
def config
def script
Bar(script, config){
this.script = script
this.config = config
}
def accessGlobalVars(){
this.script.echo "${foo.GlobalVar}" // throws an err
}
}
foo.groovy
import groovy.transform.Field
#Field GlobalVar="Hello World!"
I'm able to access the variable in the Jenkinsfile inside the script block
echo "${foo.GlobalVar}"
Is it possible to access the same variable inside the class since the vars folder is at src folder level?

Answer 1

The "${foo.GlobalVar}" in your example code is trying to resolve the foo against the Bar type. Since there is no foo reference it cannot be resolved and you will probably get something like a MissingPropertyException.
Jenkins Pipeline Groovy does some different compilation and binding using the Groovy compilation and runtime APIs. The global variables can also be resolved through the script object through its dynamic GroovyObject APIs (demonstrated in the source code here). The easiest way is to let the dynamic Groovy object resolution implemented by Jenkins resolve your variable.
Change your line from:
this.script.echo "${foo.GlobalVar}"
To instead lookup the foo from the script object (which I am presuming is the this or script in your Jenkins pipeline by new Foo(this, config)):
this.script.echo "${this.script.foo.GlobalVar}"