Spring SpEL error

Question

i'm new to Java, Spring and SpEL and i can't make this simple code work (it works without evaluation imports tho)

This is my Class RunSpring.java:

package run;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import helloworld.HelloSpringWorld;

public class RunSpring
{
    public static void main(String[] args)
    {
        //App Context
        ApplicationContext appContext = new ClassPathXmlApplicationContext("bean-data.xml");
        BeanFactory beanFactory = appContext;
        HelloSpringWorld instance = (HelloSpringWorld);
        beanFactory.getBean("helloSpringWorld");

        //Expression to be evaluated
        instance.greeting("${5+5}");
    }
}

This is my class HelloSpringWorld:

package helloworld;

import org.springframework.stereotype.Service;
//Expression imports
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpressionParser;

@Service
public class HelloSpringWorld
{
    public void greeting(String name)
    {
        //Expression Setup
        ExpressionParser parser = new SpelExpressionParser();
        Expression exp = parser.parseExpression(name);
        String message = (String) exp.getValue();

        System.out.println("Hello and welcome to Spring: " + message);
    }
}

Error: After parsing a valid expression, there is still more data in the expression: 'lcurly({)'

Any hints?

Thanks for your time.

Answer 1

Adjust the greeeting method as follows. Notice that Integer.class is passed to getValue().

public void greeting(String name)
{
    ExpressionParser parser = new SpelExpressionParser();
    Expression exp = parser.parseExpression(name);
    String message = exp.getValue(Integer.class).toString();

    System.out.println("Hello and welcome to Spring: " + message);
}

Then call with:

instance.greeting("5+5");