How to get value of attribute in Java based calculated value provider plug-in

Hi Shroon,
Same issue with script based value provider as well.
var summaryValue=workItem.getValue(WorkItemAttributes.SUMMARY);
      console.log("Get Summary Value : " +summaryValue);
The above API returns empty though text has been entered in Summary attribute. The same issue with String type attribute as well.
But works with enumeration or integer attributes

var severity= workItem.getValue(WorkItemAttributes.SEVERITY);
console.log("Severity value is " +severity);

https://jazz.net/wiki/bin/view/Main/AttributeCustomization#Calculated_values
As per above article, it suppose to work for String, Integer and other attributes as well.
Is there any change in 6.0.1?. I had developed calculated value provider scripts in 5.0.1 for computation purpose and it had worked.

/sample script/
dojo.provide("com.example.getsummaryvalue");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");
(function() {
    var WorkItemAttributes = com.ibm.team.workitem.api.common.WorkItemAttributes;
    dojo.declare("com.example.getsummaryvalue", null, {
        getValue: function(attribute, workItem, configuration) {
            var isSet=workItem.isAttributeSet(WorkItemAttributes.SUMMARY);
             console.log("Get Summary Value Script : isSet : " +isSet);
             var summaryValue=workItem.getValue(WorkItemAttributes.SUMMARY);
             console.log("Get Summary Value : " +summaryValue);
            return summaryValue;
        }
    });
})();

Sharoon
I could progress by developing DataConnector plug-in similar to HTTPConnector and it helped me to consume external REST service in a script. It is explained here https://jazz.net/wiki/bin/view/Main/DataSourceValueSetProviders#Tutorial_for_providing_a_custom. Thanks.