// jenkins/Application.groovy
package jenkins

class Application{
    String name
    Application(name){
        this.name = name
    }
}

final GroovyScriptEngineImpl engine = (GroovyScriptEngineImpl) this.scriptingEngines.getEngineByName("groovy");
GroovyClassLoader classLoader = engine.getClassLoader();
classLoader.parseClass(new GroovyCodeSource("./jenkins/Application.groovy"))
engine.setClassLoader(classLoader)

// jenkins/Application.groovy
// Added
return { Application }
// jenkins/Test.groovy
app = load "./jenkins/Application.groovy"

def dna = new app.Application("blah")