HashCodeCacheKeyGenerator provides duplicate hashes

[GoogleCodeExporter]

What steps will reproduce the problem?
run this code:
    public static void main(String[] args) {
        HashCodeCacheKeyGenerator g = new HashCodeCacheKeyGenerator();
        System.out.println(g.generateKey(DynamicFormService.class, "getFieldByEntityIdAndTypeId", Field.class, 2, 19));
        System.out.println(g.generateKey(DynamicFormService.class, "getFieldByEntityIdAndTypeId", Field.class, 1, 50));
    }

What is the expected output? What do you see instead?
I suppose to see different hashes returned, but seeing the same for different 
set of parameters

What version of the product are you using? On what operating system?
ehcache-spring-annotations-1.2.0.jar 
ehcache-core-2.4.7.jar               
ehcache-web-2.0.4.jar                

Please provide any additional information below.
N/A

Original issue reported on code.google.com by usate...@gmail.com on 11 May 2012 at 10:38