NamedList problem in solr

Here i had added code below in which i had ArrayList Which contains values and then i am adding that values to my named list

NamedList final1 =开发者_运维知识库 null;
NamedList<ArrayList<String>> result = null;
ArrayList<String> data=\\ It has values
result.add("Gender",data);
ArrayList<String> data1=\\ It has values 
result.add("Group ID",data1);
final1.add("Query",result);

But the code is not working. I don't know why this code is not working. CAN Any one guide me.

Thanks in advance

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You declared final1 to be null and didn't initialize it before using it.

So, when the code:

final1.add("Query",result);

executes, it throws a NullPointerException.

To fix this, you should initialize final1 before using it. Something like:

NamedList final1 = new NamedList();