Temenos t24 api updateCoreRecord java development

Question

Is there an example of how we can use this method to update a core record upon validation of a certain version? For example, after validating from a version in CUSTOMER application, some fields of a record in MM application will be updated according to input. Have already searched on google but found no answer as the resource of t24 java development is very limited.

Below is my code:

package com.sofgen.scsb;

import java.time.LocalDateTime;
import java.util.List;

import com.sofgen.common.T24Rec;
import com.temenos.api.LocalRefClass;
import com.temenos.api.TBoolean;
import com.temenos.api.TString;
import com.temenos.api.TStructure;
import com.temenos.api.TValidationResponse;
import com.temenos.t24.api.hook.system.RecordLifecycle;
import com.temenos.t24.api.records.account.*;
import com.temenos.t24.api.records.country.*;
import com.temenos.t24.api.records.customer.*;
import com.temenos.t24.api.system.DataAccess;
import com.temenos.t24.api.records.mmmoneymarket.*;
/**
 * TODO: Document me!
 *
 * @author ZEPHYRUS
 *
 */
public class UpdateCoreTest extends RecordLifecycle {

    @Override
    public void defaultFieldValues(String application, String recordId, TStructure record, TStructure lastLiveRecord) {
        // TODO Auto-generated method stub

    }

    @Override
    public TValidationResponse validateRecord(String application, String recordId, TStructure record,
            TStructure lastLiveRecord) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public TBoolean updateLookupTable(String application, String recordId, TStructure record, TStructure lastLiveRecord,
            TString lookupTableName, TString key, TString entryToDelete, TString entryToAdd, TBoolean sortAsNumber) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void updateCoreRecord(String application, String recordId, TStructure record, TStructure lastLiveRecord,
            List<String> versionNames, TBoolean isZeroAuth, List<String> recordIds, List<TStructure> records) {
        // TODO Auto-generated method stub

        DataAccess da = new DataAccess(this);
        AccountRecord acctRd = new AccountRecord(da.getRecord("ACCOUNT", "0082208301000172"));
        String text = "Test Date:"+ LocalDateTime.now().toString();
        int sizeOfRemark = 0;
        sizeOfRemark = acctRd.getLocalRef("CNMB.C.REMARK").get().size();
        
        if(sizeOfRemark==0){
            acctRd.getLocalRef("CNMB.C.REMARK").add(text);
        }else{
            for(int i=0;i<sizeOfRemark;i++){
                acctRd.getLocalRef("CNMB.C.REMARK").get(i).set(text);
            }
        }
        
        versionNames.add("ACCOUNT,AMEND");
        isZeroAuth.set(true);
        recordIds.add("0082208301000172");
        records.add(acctRd.toStructure());
        
    }

    @Override
    public void setOverrideComparisonValue(String overrideMessage, List<String> messageDetails,
            TString overrideComparisonValue) {
        // TODO Auto-generated method stub

    }

    @Override
    public String checkId(String idNew) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String formatDealSlip(String data, TStructure record) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public TValidationResponse validateField(String application, String recordId, String fieldData, TStructure record) {
        // TODO Auto-generated method stub
        return null;
    }

}

After compilation and deployment to the testing enviroment, error shows upon validation. Please check the image below. Screenshot of the version which the routine attached.