spock_spring_pom.xml

...
<properties>
	<spock.version>1.1-groovy-2.4</spock.version>
</properties>
...
<dependencies>
    ...
	<dependency>
    		<groupId>org.spockframework</groupId>
    		<artifactId>spock-spring</artifactId>
    		<scope>test</scope>
	</dependency>
</dependencies>

<plugins>
	...
	<plugin>
        	<artifactId>maven-compiler-plugin</artifactId>
        		<configuration>
          			<compilerId>groovy-eclipse-compiler</compilerId>
          		 	<source>1.8</source>
           			<target>1.8</target>
        		</configuration>
        		<dependencies>
          			<dependency>
            			<groupId>org.codehaus.groovy</groupId>
            			<artifactId>groovy-eclipse-compiler</artifactId>
            			<version>2.9.2-01</version>
          		</dependency>
          		<dependency>
            			<groupId>org.codehaus.groovy</groupId>
            			<artifactId>groovy-eclipse-batch</artifactId>
            			<version>2.4.3-01</version>
          			</dependency>
        		</dependencies>
      		</plugin>
</plugins>
...