List Knowledge Articles on Visualforce Page

Question

I am working on KnowledgeArticleVersion and want to show the list of articles on Visual force page.

SObjectType objToken = Schema.getGlobalDescribe().get('KnowledgeArticleVersion');
DescribeSObjectResult objDef = objToken.getDescribe();
Map<String, SObjectField> fields = objDef.fields.getMap();

Set<String> fieldSet = fields.keySet();
for(String s:fieldSet)
{
    SObjectField fieldToken = fields.get(s);
    DescribeFieldResult selectedField = fieldToken.getDescribe();
    System.debug(selectedField.getName());
}

When I try to run this through apex, I get an exception

System.NullPointerException: Attempt to de-reference a null object.

I am able to run this SOQL Query using same object,

SELECT Id, Title FROM KnowledgeArticleVersion WHERE
PublishStatus='Online' AND language ='en_US'

The framework that we are using does not allow this SOQL Query to be used and does a describe and fetches fields dynamically.

Can someone please provide a help or pointer on this ?

Answer 1

I have to use the workaround as mentioned in the above comments by fellow members. KnowledgeArticleVersion.getSObjectType().getDescribe() instead of Schema.getGlobalDescribe().get('KnowledgeArticleVersion').

This is not truly dynamic in nature since I had to check in the code for name of Object and make a database call accordingly.