spring-mvc - NULL 値が格納されている

Question

私は angularjs と Spring フレームワークに取り組んでいます。データベースからフォームにデータを取り込もうとしています.tは正常に動作します.今、まったく同じデータを変更せずに再度保存すると... DBにnull値が送信されます。モデルが更新されていないと思いますが、これは最初にデータをフォームに取り込むために使用しているモデルと同じです。だから、誰か私を助けてくれませんか？

私のHTML：

<div class="span12">Contract Duration [?]</div>
<div class="span3" height="20px"></div>
<div class="span4"><input id="duration" type="text"   value={{data1.contractDuration}}
    placeholder="enter duration in years" ng-model="param.contractDuration"
    name="amount" /></div>
</div>
</div>


<div class="landingHeadeLabel row-fluid subdiv2"><label
    class=" subHead">&nbsp;&nbsp;&nbsp;&nbsp;Criteria
for Auto Status Change based on Amendment in CMS</label></div>
<div class="row-fluid supersubDiv2">
<div class="row-fluid marginDiv2">
<div class="span12">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sum of
Amendments [?]</div>
<div class="span3"><select class="select"
    ng-model="param.sumOfAmendmentsCurrency"
    ng-options="curItr for curItr in param.currencyList"><option value="">{{data1.sumOfAmendmentsCurrency}}</option>
</select></div>
<div class="span4"><input id="amendmentsum" type="text"  value={{data1.sumOfAmendments}}
    placeholder="enter value" ng-model="param.sumOfAmendments"
    name="amount" /></div>
<div class="span4" >
<h4 class="note">Note:</br>
Status of FCM Contract for which Contract Value bifurcation is not done
will be changed to Requires Resubmission triggered by Amendment in CMS
contract if below criteria are met on amendment.</h4>
</div>
<div class="span12">
<p>No. of Amendments [?]</p>
</div>

<div class="span4"><input id="amendments" type="text"  value={{data1.numberOfAmendments}}
    placeholder="enter duration" ng-model="param.numberOfAmendments"
    name="amount" /></div>
</div>

</div>
<div align="right" class="finalDiv">
<a href="" ng-click="cancelCntrctDtls()">Cancel</a> <input type="button"
    class="btn saveButton" 
    value="Save Configuration" ng-click="saveCntrctDtls()"></div>
</div>
</div>


@RequestMapping(value = "/savecntrctdtls", method=RequestMethod.POST,produces="application/json")
    public @ResponseBody ParamConfigDtlsDto saveDetails(@RequestBody ParamConfigDtlsDto objParamConfigDto)throws Exception{

        LOG.info("Para Config Controller | Save Details");
        System.out.println(objParamConfigDto);
        ParamConfigDtlsDto validErrorFlag;
        ParamConfigDtlsDto paramConfigDtls=new ParamConfigDtlsDto();
        LOG.debug("Para Config Controller | DTO "+objParamConfigDto);

        LOG.info("ParamConfigSavController| save action invoked ");

        validErrorFlag=paramConfigSaveService.validateParamDetails(objParamConfigDto);

        if(!validErrorFlag.getValidateError())
        {
            paramConfigDtls=paramConfigSaveService.savDetails(objParamConfigDto);

        if(null==objParamConfigDto.getErrorMessage())
            LOG.info("ParamConfigSavController| save action successfull ");
        else
            LOG.info("ParamConfigSavController| save action unsuccessfull | Procedure Error.");
        }

        else
        {
            LOG.info("Validation Error || Please check if all entries are filled and in Proper format");
        }
        return paramConfigDtls;
    }

私のダオ:

@Override
    public void savDetails(ParamConfigDtlsDto data) throws SQLException{

        JdbcTemplate jdbcTemplate;

        String iouName=data.getIouName();
        jdbcTemplate = new JdbcTemplate(dataSource);

        int iouNameList = jdbcTemplate.queryForInt(SQLQuery.fetchIouId,new Object[]{iouName});
        data.setIouID(iouNameList);


        this.jdbcCall =  new SimpleJdbcCall(dataSource).withProcedureName(DBConstants.FCM_PARA_CONF_INS_PRC);
        jdbcTemplate = new JdbcTemplate(dataSource);

        String userId = (String)SecurityContextHolder.getContext().getAuthentication().getPrincipal();

        Map<String,Object> args=new HashMap<String,Object>(); 
        args.put(DBConstants.PI_IOU_ID,data.getIouID());
        args.put(DBConstants.PI_CONTRACT_VALUE,data.getContractValue());
        args.put(DBConstants.PI_CONTRACT_DURATION,data.getContractDuration());
        args.put(DBConstants.PI_CURRENCY_ID,data.getContractCurrency());
        args.put(DBConstants.PI_DURATION_UNIT,"YEARS");                             /*As per requirement,default value of contract duration is in Years*/
        args.put(DBConstants.PI_AMENDMENT_SUM_AMT,data.getSumOfAmendments());
        args.put(DBConstants.PI_AMENDMENT_COUNT,data.getNumberOfAmendments());
        args.put(DBConstants.PI_AMENDMENT_CURRENCY_ID,data.getSumOfAmendmentsCurrency());
        args.put(DBConstants.PROC_PI_USER_ID,userId);

        Map<String,Object> out=jdbcCall.execute(args); 

        ParamConfigDtlsDto paramConfigDtlsDto=new ParamConfigDtlsDto(); 
        paramConfigDtlsDto.setErrorCode((String)out.get(DBConstants.PO_ERROR_CODE));
        paramConfigDtlsDto.setErrorMessage((String)out.get(DBConstants.PO_ERROR_MSG));


    }
}

データ保存用のMYクライアント側スクリプト：

$http.post('rest/savecntrctdtls',$scope.param).success(function(data){
                $scope.errsuccess=true;

            }).error(function(data){
                alert("error while saving data | Flag returned is");
            });