Jenkins pipeline shared library can't invoke method in src directory - jenkins

Question

I want to invoke method of src directory from vars directory, which it works in IDE. But it seems not work in Jenkins.
1.project structure
├── src
│ └── foo
│ └── DemoClass.groovy
└── vars
└── varDemo.groovy
2.Content of DemoClass.groovy
#!groovy
package foo
class DemoClass {
def testDemoMethod() {
println("src DemoClass testDemoMethod")
}
}
3.Content of varDemo.groovy
#!groovy
import foo.DemoClass
def testVarsDemo() {
println("vars varDemo.groovy testVarsDemo")
}
def testVarsInvokeDemoMethod() {
println("vars varDemo.groovy testVarsInvokeDemoMethod")
def demoClass = new DemoClass()
demoClass.testDemoMethod()
println("end vars varDemo.groovy testVarsInvokeDemoMethod")
}
4.Jenkins pipeline
#Library('tools') _
varDemo.testVarsDemo()
varDemo.testVarsInvokeDemoMethod()
5.execute result in pipeline
> git checkout -f b6176268be99abe300d514e1703ff8a08e3ef8da
Commit message: "test"
> git rev-list --no-walk c1a50961228ca071d43134854548841a056e16c9 # timeout=10
[Pipeline] echo
vars varDemo.groovy testVarsDemo
[Pipeline] echo
vars varDemo.groovy testVarsInvokeDemoMethod
[Pipeline] echo
end vars varDemo.groovy testVarsInvokeDemoMethod
[Pipeline] End of Pipeline
It seem like demoClass.testDemoMethod() not work. Why can't invoke demoClass.testDemoMethod()? If I want to invoke the method in src directory, what should I do? Thank you!

Answer 1

Without reimplementing your code sections locally, Here are some differences I notice between yours and mine that is working.
JENKINSFILE
I don't have a space before the underscore on my #Library line
Immediately after my #Library line I am importing my shared library class that implements the methods I want to call. In your case this would be import foo.DemoClass
My call to my method is of the form (new DemoClass(config, this)).testVarsInvokeDemoMethod()
SHARED LIBRARY CLASSES
I don't have #!groovy in any of my groovy classes.
My class is public and implements Serializable
Hopefully one of these difference is the source of why its not getting called.

Answer 2

We need to follow the below structure
src/packagename/GroovyFile.groovy
vars/callFromJenkinsPipelne.groovy
The jenkins pipeline should be like this .
library('libracyname#Branchname')
callFromJenkinsPipelne()
Inside the vars file ( callFromJenkinsPipelne) , we can call the groovy file which is in src folder
//code in vars folder groovy file will be like this
for callFromJenkinsPipelne groovy file
def call(){
GroovyFile groovyFile = new com.jenkins.mypackagename.GroovyFile()
groovyFile.methodName(parameters)
}