[GROOVY-7937] CLONE - same linkedlist code different behavior between groovy and java (fix priority of DGM methods vs actual methods on an object)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.5.0-alpha-1
• Component/s: jdk conflict
• Labels: breaking
• Assignee: Paul King
• Reporter: boshi
• Created: 13/Sep/16 06:30
• Updated: 17/May/17 15:39
• Resolved: 16/Sep/16 21:54

Description

I am using `linkedlist` as a stack in groovy

as doc says, `pop()` take elm from the first

Stack Method Equivalent Deque Method
push(e) addFirst(e)
pop() removeFirst()

so a `linkedlist` [1,2,3] should pop() 1 2 3

and it does in Java, but does NOT in groovy. WHY?

test below

A.java

import java.util.*;
    
public class A{
    
    
    public static void main(String[] args){
    
        String[] x = "1/2/3/".split("/");
        LinkedList <String> stack = new LinkedList<String>(Arrays.asList(x));
        System.out.println(stack.pop());
    }
}

compile and run

$ javac A.java
$ java A
1

runing in groovy

    
$ ln -s A.java A.groovy
$ groovy A.groovy
3

here is my java and groovy version

$ java -version
java version "1.6.0_51"
Java(TM) SE Runtime Environment (build 1.6.0_51-b11-457-11M4509)
Java HotSpot(TM) 64-Bit Server VM (build 20.51-b01-457, mixed mode)

$ groovy -version
Groovy Version: 2.1.5 JVM: 1.6.0_51 Vendor: Apple Inc. OS: Mac OS X

Issue Links

• is a clone of: GROOVY-6396 same linkedlist code different behavior between groovy and java
• relates to: GROOVY-4851 NullPointerException on iterator() call
• links to: GitHub Pull Request #418