将参数从java传递到groovy

Question

I have a groovy script like:

import groovy.sql.Sql

Object execute(def params = null) {

    def sql = new DBUtils().getConnection()

    println "sql params : " + params

    ...
}

And the java class will call this script like:

Class scriptClass = new GroovyClassLoader().parseClass( new File(url) ) ;

Object scriptInstance = scriptClass.newInstance() ;

String param = {"test"};

Object obj = scriptClass.getDeclaredMethod("execute", new Class[] {})
    .invoke( scriptInstance, new Object[] {param}  ) ;

I've tried various format arguments but none of them work. The above sample will throw the java.lang.IllegalArgumentException: wrong number of arguments

Any thoughts? appreciated.

Answer 1

You don't specify the arguments' type properly, it should be:

String param = "test";
Object obj = scriptClass.getDeclaredMethod("execute", new Class[]{Object.class})
    .invoke(scriptInstance, new Object[]{param});

Indeed, if you call getDeclaredMethod("execute", new Class[]{}) , you will get a method execute with no argument so it is not compatible with an invoke using an argument as you are trying to do.