java.lang.NoClassDefFoundError: groovy/lang/GroovyObject

Download the groovy-all.jar and add it to the classpath.

With Maven, add this to your dependencies (browse groovy-all on mvnrepository.com):

<dependency>
    <groupId>org.codehaus.groovy</groupId>
    <artifactId>groovy-all</artifactId>
    <version>2.4.5</version>
</dependency>