how to run vars/script.groovy from a Jenkins shared library - jenkins-pipeline

Question

I'm trying to get information from a groovy script located under vars called from a shared library Jenkins class but gets an error. some info:
Need - global configuration file. similar to Manage Jenkins -> Configure System -> Environment variables
Goal - to be able to get global values inside shared library without sending parameters from Jenkinsfile.
My solution - I tried to use "vars/script.groovy" which works for Jenkinsfile but not inside shared library.
file structure
.
├── src
│   └── org
│   └── jenkins
│ └──shared_library.groovy
│── vars
│ └── globals.groovy
│
│── jenkinsfile.groovy
vars/globals.groovy
def my_global() {
return 'my_global_name'
}
shared_library class
package src.org.jenkins
class shared_library implements Serializable {
private steps
shared_library(steps) {
this.steps = steps
}
def some_func(){
println globals.my_global
}
jenkinsfile
#Library 'shared_library'
import org.jenkins.shared_library
my_shared_library = new shared_library(steps)
node(){
stage('my_first_stage'){
println globals.my_global
}
stage('my_second_stage'){
println shared_library.some_func()
}
}
so, I can see the value for the first print in pipeline, but for the second I get:
No such property: globals for class: src.org.jenkins.shared_library

Answer 1

You need to use the steps object as well to access the globals:
def some_func(){
println steps.globals.my_global()
}
Taking your example that would become
shared_library class
package src.org.jenkins
class shared_library implements Serializable {
private steps
shared_library(steps) {
this.steps = steps
}
def some_func(){
println steps.globals.my_global()
}
Edit: Just saw your Jenkinsfile has a typo as well. Need to use the shared library object instead of the class in 'my_second_stage':
Jenkinsfile
#Library('shared_library')
import org.jenkins.shared_library
my_shared_library = new shared_library(steps)
node(){
stage('my_first_stage'){
println globals.my_global()
}
stage('my_second_stage'){
println my_shared_library.some_func()
}
}

Answer 2

If you are comfortable with defining the value in .properties or .json files you can use 'resource' folder
sharedlibrary/resource/global.properties
In your pipeline script or var/script.groovy
Use the libraryResource method
globalPropertyContent = libraryResource 'global.properties'
access the property values like:
globalPropertyContent.PROJECT_NAME