Use of "int" causes method signature crash

Running this:

#!/usr/bin/env groovy

public class Test {
public void test()

}

Test t = new Test()

Results in:
Exception in thread "main" java.lang.VerifyError: (class: Test, method:
test signature: ()V) Expecting to find integer on stack
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:140)
at test.class$(test.groovy)
at test.run(test.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Removing "int" eliminates the crash.