Objectmapper serialization in Jackson

I want to serialize different types of lists by using an object mapper, but I don't know how

AccountingService accService      = ServiceFactory.getAccountingService();
List<TaxCategory> taxCategoryList = accService.getAllTaxCategories();
ProductService productService     = ServiceFactory.getProductService();
List<SimpleUom> simpleUomList     = productService.getSimpleUomsList();

ObjectMapper objMapper;
objMapper.writeValueAsString(?)--

Can you suggest what I have to pass? The code above This is because I have to take the Jackson serialized string containing the above list as a single string in the JSP and parse the string to get a single list used on the client

Solution

Just try:

ObjectMapper objMapper = new ObjectMapper();
String jsonString = objMapper.writeValueAsString(simpleUomList);

Edit according to comments:

You need to create a class that wraps two lists and write it:

public class MyLists {
    private List<TaxCategory> taxCategoryList;
    private List<SimpleUom> simpleUomList;
    // + constructor,getters and setters
}

ObjectMapper objMapper = new ObjectMapper();
MyLists myLists = new MyLists(taxCategoryList,simpleUomList);
String jsonString = objMapper.writeValueAsString(myLists);