Generating JSON strings from Java objects with JSON-B

In addition to populating Java objects from JSON data, JSON-B can also generate JSON strings from Java objects. The following example illustrates how to do this:

    package net.ensode.javaee8book.jsonbjavatojson.service; 
 
    //imports omitted for brevity 
 
    @Path("/customersearchcontroller") 
    public class CustomerSearchControllerService { 
      private final List<Customer> customerList = new ArrayList<>(); 
 
      @GET 
      @Path("{firstName}") 
      public Response getCustomerByFirstName(@PathParam("firstName")   
      String firstName) { 
        List<Customer> filteredCustomerList; 
        String jsonString; 
        initializeCustomerList(); //method declaration omitted 
 
        Jsonb jsonb = JsonbBuilder.create(); 
 
        filteredCustomerList = customerList.stream().filter( 
                customer -> customer.getFirstName().equals(firstName)). 
                collect(Collectors.toList...