Consider this:

package test42

class GBean {

	GBean() {}
	
	GBean(String foo, String bar = 'hello') {}
	
	void doSomething() {}
	
	void doSomething(String foo, String bar = 'bar') {}
}

And this:

package test42;

class Test43 {

	void test() {
		def b2 = new GBean('foo')
		
		b2.doSomething()
		b2.doSomething('foo')
		b2.doSomething('foo', 'bar')
	}
}

Now put the cursor on:

• doSomething on b2.doSomething('foo')
• GBean on def b2 = new GBean('foo')

Invoke Call Hierarchy in both cases. Greclipse respectively:

• searches for references to test42.GBean.doSomething(String), which does not exists; it should match test42.GBean.doSomething(String, String) and search references for that instead
• searches for references to test42.GBean.GBean(String), which does not exists; it should match test42.GBean.GBean(String, String) and search references for that instead