BuildConfig.groovy

grails.project.class.dir = "target/classes"
grails.project.test.class.dir = "target/test-classes"
grails.project.test.reports.dir = "target/test-reports"
grails.project.war.file = "target/${appName}-${appVersion}.war"
grails.project.dependency.resolution = {
    // inherit Grails' default dependencies
    inherits("global") {
        // uncomment to disable ehcache
        // excludes 'ehcache'
    }
    log "warn" // log level of Ivy resolver, either 'error', 'warn', 'info', 'debug' or 'verbose'
    repositories {
        grailsPlugins()
        grailsHome()
        grailsCentral()

        // uncomment the below to enable remote dependency resolution
        // from public Maven repositories
        mavenLocal()
        mavenCentral()
        mavenRepo "http://snapshots.repository.codehaus.org"
        mavenRepo "http://repository.codehaus.org"
        mavenRepo "http://download.java.net/maven/2/"
        mavenRepo "http://repository.jboss.com/maven2/"
    }
    dependencies {
        // specify dependencies here under either 'build', 'compile', 'runtime', 'test' or 'provided' scopes eg.

        runtime(
			[group:'mysql', name:'mysql-connector-java', version:'5.1.16']
		)
		test(
			[group:'org.mockito', name:'mockito-all', version:'1.8.5'],
			[group:'org.hamcrest', name:'hamcrest-all', version:'1.1']
		)
    }
}

DataSource.groovy

dataSource {
    pooled = true
    driverClassName = "org.hsqldb.jdbcDriver"
    username = "sa"
    password = ""
}
hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = true
    cache.provider_class = 'net.sf.ehcache.hibernate.EhCacheProvider'
}
// environment specific settings
environments {
    development {
        dataSource {
            dbCreate = "update" // one of 'create', 'create-drop','update'
            url = "jdbc:mysql://localhost:3306/test"
            username = "test"
            password = "test"
        }
    }
    test {
        dataSource {
            dbCreate = "update"
            url = "jdbc:hsqldb:mem:testDb"
        }
    }
    production {
        dataSource {
            dbCreate = "update"
            url = "jdbc:hsqldb:file:prodDb;shutdown=true"
        }
    }

Persona.groovy

package testgrailsshell

class Persona {

    String nombre
    Integer edad

    static constraints = {
    }
}