JaninoExample.java

package org.komamitsu.test;

import org.codehaus.commons.compiler.CompilerFactoryFactory;
import org.codehaus.commons.compiler.IClassBodyEvaluator;

import java.lang.reflect.Method;

public class JaninoExample
{
    public int add(int a, int b)
    {
        System.out.println("Hello: " + (a + b));
        return a + b;
    }

    public static void main(String args[])
            throws Exception
    {
        new JaninoExample().run();
    }


    public void run()
            throws Exception
    {
        IClassBodyEvaluator cbe = CompilerFactoryFactory.getDefaultCompilerFactory().newClassBodyEvaluator();
        cbe.cook(
                "public static int newAdd(org.komamitsu.test.JaninoExample x, int a, int b)\n" +
                "{\n" +
                "  System.out.println(a);\n" +
                "  return x.add(a, b);\n" +
                "}\n"
                );

        Class<? extends JaninoExample> clazz = (Class<? extends JaninoExample>) cbe.getClazz();
        Method newAdd = clazz.getMethod("newAdd", JaninoExample.class, int.class, int.class);
        System.out.println(newAdd.invoke(null, this, 12, 42));
    }
}