Calling a Groovy function from Java

Question

How do you call a function defined in a Groovy script file from Java?

Example groovy script:

def hello_world() {
   println \"Hello, world!\"
}
         


        

Answer 1

Just more elegant ways:

GroovyScriptEngine engine = new GroovyScriptEngine( "." )

Object instance = engine
  .loadScriptByName(scriptName)
  .newInstance()

Object result = InvokerHelper.invokeMethod(instance, methodName, args)

And if script class extends groovy.lang.Script:

Object result = engine
  .createScript(scriptName, new Binding())
  .invokeMethod(methodName, args)

No need to extend groovy.lang.Script if you just want call main method of your groovy class:

Object result = engine
  .createScript(scriptName, new Binding())
  .run()