I just noticed that Eclipse is not able to find method call references from Groovy classes.

Here's a very simple example:

Service.groovy:

public interface Service {
    public void findThisMethod(Long producerOid, Long agreementOid);
}

ServiceImpl1.groovy:

class ServiceImpl1 implements Service {
    public void findThisMethod(Long producerOid, Long agreementOid) {
        println "Here"
    }
}

BackingBean.java:

public class BackingBean {
    Service service;

    public void method1() {
        service.findThisMethod(0L, 0L);
    }
}

Now, if I right click on ServiceImpl1.findThisMethod -> Open Call Hierarchy, I get the correct info:

Now, let's rename BackingBean**.java** to BackingBean**.groovy** and run Open Call Hierarchy again. Now we are no longer able to find the method reference:

I am using Groovy-Eclipse 2.9.2.xx-201502281941-e44.