See http://techbeats.deluan.com/using-spring-di-in-your-gaelyk-projects

index.groovy

import com.deluan.gaelyk.SpringApplicationContext

def dateFormat = SpringApplicationContext.getBean('dateFormat')
def now = new Date()

println dateFormat.format(now)

index2.groovy

def now = new Date()

// Simple context lookup
def dateFormat = getBean('dateFormat')

// Resolve a list of bean names and create bindings for each one of them
autowire this, ['timeFormat', 'dateTimeFormat']

html.html {
    body {
        p appCtx.displayName  // Access the ApplicationContext
        p dateFormat.format(now)
        p timeFormat.format(now)
        p dateTimeFormat.format(now)
    }
}

plugins.groovy

install spring

pom.xml

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

resources.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="springApplicationContext" class="com.deluan.gaelyk.SpringApplicationContext"/>

    <bean id="dateFormat" class="java.text.SimpleDateFormat">
        <constructor-arg value="yyyy/MM/dd" />
    </bean>

    <bean id="timeFormat" class="java.text.SimpleDateFormat">
        <constructor-arg value="hh:mm:ss" />
    </bean>

    <bean id="dateTimeFormat" class="java.text.SimpleDateFormat">
        <constructor-arg value="yyyy/MM/dd hh:mm:ss" />
    </bean>

</beans>

spring.groovy

import com.deluan.gaelyk.SpringApplicationContext

binding {
    appCtx = SpringApplicationContext.context

    getBean = {
        SpringApplicationContext.getBean(it)
    }

    autowire = { self, beanNames ->
        beanNames.each {
            self.setProperty(it, SpringApplicationContext.getBean(it))
        }
    }
}

SpringApplicationContext.java

package com.deluan.gaelyk;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * Wrapper to always return a reference to the Spring Application Context from
 * within non-Spring enabled beans. Unlike Spring MVC's WebApplicationContextUtils
 * we do not need a reference to the Servlet context for this. All we need is
 * for this bean to be initialized during application startup.
 *
 * Original from http://sujitpal.blogspot.com/2007/03/accessing-spring-beans-from-legacy-code.html
 */
public class SpringApplicationContext implements ApplicationContextAware {

    private static ApplicationContext CONTEXT;

    /**
     * This method is called from within the ApplicationContext once it is
     * done starting up, it will stick a reference to itself into this bean.
     * @param context a reference to the ApplicationContext.
     */
    public void setApplicationContext(ApplicationContext context) throws BeansException {
        CONTEXT = context;
    }

    /**
     * This is about the same as context.getBean("beanName"), except it has its
     * own static handle to the Spring context, so calling this method statically
     * will give access to the beans by name in the Spring application context.
     * As in the context.getBean("beanName") call, the caller must cast to the
     * appropriate target class. If the bean does not exist, then a Runtime error
     * will be thrown.
     * @param beanName the name of the bean to get.
     * @return an Object reference to the named bean.
     */
    public static Object getBean(String beanName) {
        return CONTEXT.getBean(beanName);
    }

    public static ApplicationContext getContext() {
        return CONTEXT;
    }
}

web.xml

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/spring/*.xml
        </param-value>
    </context-param>

    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>