Receive JSON data in Spring Boot MVC Controller

FormsApiController.java

@RequestMapping(value = "/api/form/saveForm", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public Map saveForm(HttpServletRequest request, HttpServletResponse response, @RequestBody String payload) {
        SessionManager sessionManager = new SessionManager(request, response);

        Map result = null;

        FormBL formBL = new FormBL(request, response);
        result = formBL.saveForm(payload);

        return result;
    }

FormBL.java

    public Map<String, Object> saveForm(String payload) {
        Map<String, Object> result = new HashMap<>();

        try {

            Gson gson = new Gson();
            PojoForm pojoForm = gson.fromJson(payload, PojoForm.class);

            Form form = new Form();
            if (pojoForm.formId > 0) {
                form.id = pojoForm.formId;
            }


            Machinery machinery = null;

            if (pojoForm.machineryId > 0) {
                machinery = Statics.machineryRepository.findById(pojoForm.machineryId);
            }

            form.name = pojoForm.formName;
            form.machinery = machinery;

            Form dbForm = Statics.formRepository.save(form);
            pojoForm.formId = dbForm.id;

            if (pojoForm.formRows.size() > 0) {
                for (PojoFormRow row : pojoForm.formRows) {
                    FormRow formRow = new FormRow();

                    if (row.getId() > 0) {
                        formRow.id = row.getId();
                    }

                    formRow.rowOrder = row.row_order;
                    formRow.rowType = row.getRowType();
                    formRow.title = row.getTitle();
                    formRow.form = dbForm;

                    FormRow dbFormRow = Statics.formRowRepository.save(formRow);
                    row.id = dbFormRow.id;

                    if (row.getRow_values().size() > 0) {
                        for (PojoRowValue rowValue : row.getRow_values()) {
                            RowSelectValue rowSelectValue = new RowSelectValue();

                            if (rowValue.getId() > 0) {
                                rowSelectValue.id = rowValue.getId();
                            }

                            rowSelectValue.title = rowValue.title;
                            rowSelectValue.titleOrder = rowValue.title_order;
                            rowSelectValue.formRow = dbFormRow;

                            RowSelectValue dbRowSelectValue = Statics.rowSelectValueRepository.save(rowSelectValue);
                            rowValue.id = dbRowSelectValue.id;
                        }
                    }
                }
            }

            result.put("form", "");
            result.put("error", 0);
        } catch (Exception ex) {
            // exception
            result.put("error", 1);
            ex.printStackTrace();
        }

        return result;
    }

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