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

One simple example:

import groovy.lang.GroovyClassLoader;
import groovy.lang.Script;

public class GroovyEmbedder {

    static public final String GROOVY_SCRIPT=
            "println ('Hello World !')";

    static public void main(String[] args) throws Exception {
        ((Script) new GroovyClassLoader().parseClass(GROOVY_SCRIPT).newInstance()).run();
    }
}

Testing

> javac -cp groovy-all-2.4.10.jar GroovyEmbedder.java
> java -cp groovy-all-2.4.10.jar:. GroovyEmbedder
Hello World !