How to run groovy script in java?

Basic Java+Groovy Integration:

// call groovy expressions from Java code
Binding binding = new Binding();
binding.setVariable("foo", new Integer(2));
GroovyShell shell = new GroovyShell(binding);

Object value = shell.evaluate(groovyScript);

See this article for more ways to call Groovy from Java

PS: You need to include groovy-all-m.n.m.jar e.g. groovy-all-2.1.6.jar in your Java program, for example:

<dependency>
  <groupId>org.codehaus.groovy</groupId>
  <artifactId>groovy-all</artifactId>
  <version>2.4.8</version>
</dependency>