GAnt script used to execute Groovy script inside of Grails context

RunScript.groovy

import org.codehaus.groovy.grails.commons.GrailsClassUtils as GCU
import org.springframework.orm.hibernate3.SessionFactoryUtils
import org.springframework.orm.hibernate3.SessionHolder
import org.springframework.transaction.support.TransactionSynchronizationManager

includeTargets << grailsScript("_GrailsBootstrap")
includeTargets << grailsScript("_GrailsRun")
includeTargets << grailsScript("_GrailsSettings")
includeTargets << grailsScript("_GrailsClean")

target('default': "Execute the specified script after starting up the application environment") {
    depends(checkVersion, configureProxy, packageApp, classpath)
    runScript()
}

target(runScript: "Main implementation that executes the specified script after starting up the application environment") {
    parseArguments()
    if (argsMap["params"].size() == 0) {
        event("StatusError", ["Required script name parameter is missing"])
        System.exit 1
    }
    compile()
    loadApp()
    configureApp()
    configureHibernateSession()
    argsMap["params"].each { scriptFile ->
        executeScript(scriptFile, classLoader)
    }
}

def configureHibernateSession() {
    // without this you'll get a lazy initialization exception when using a many-to-many relationship
    def sessionFactory = appCtx.getBean("sessionFactory")
    def session = SessionFactoryUtils.getSession(sessionFactory, true)
    TransactionSynchronizationManager.bindResource(sessionFactory, new SessionHolder(session))
}

def executeScript(scriptFile, classLoader) {
    File script = new File(scriptFile)
    if (script.exists()) {
        def shell = new GroovyShell(classLoader, new Binding(ctx: appCtx, grailsApplication: grailsApp))
        shell.evaluate(script.text)
    } else {
        event("StatusError", ["Designated script doesn't exist: $scriptFile"])
    }
}