How can I save list data in issue using custom field?

[Vishal Petkar]

I am a beginner with Jira custom fields

Created a demo plugin on the local server, 

added a custom field module in that to store a BigDecimal

Now I want to add a list of data in the custom field

The class I have implemented 

package com.intel.cfdemo.jira.customfields;

import com.atlassian.jira.issue.customfields.impl.AbstractSingleFieldType;
import com.atlassian.jira.issue.customfields.persistence.PersistenceFieldType;
import com.atlassian.plugin.servlet.util.DefaultPathMapper;
import com.atlassian.plugin.spring.scanner.annotation.component.Scanned;
import com.atlassian.plugin.spring.scanner.annotation.imports.ComponentImport;
import com.atlassian.plugin.spring.scanner.annotation.imports.JiraImport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.atlassian.jira.issue.customfields.impl.TextCFType;
import com.atlassian.jira.issue.customfields.manager.GenericConfigManager;
import com.atlassian.jira.issue.customfields.persistence.CustomFieldValuePersister;
import com.atlassian.jira.issue.customfields.impl.FieldValidationException;
import com.atlassian.jira.issue.Issue;
import com.atlassian.jira.issue.fields.CustomField;
import com.atlassian.jira.issue.fields.config.FieldConfig;
import com.atlassian.jira.issue.fields.layout.field.FieldLayoutItem;

import javax.inject.Inject;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

@Scanned
public class MyCustomField extends AbstractSingleFieldType<BigDecimal> {

    @Inject
    public MyCustomField(
            @JiraImport CustomFieldValuePersister customFieldValuePersister,
            @JiraImport GenericConfigManager genericConfigManager
            ) {
        super(customFieldValuePersister, genericConfigManager);
    }

    @Override
    public String getStringFromSingularObject(final BigDecimal singularObject) {
        System.out.println("getStringFromSingularObject 1");
        System.out.println(singularObject);
        if (singularObject == null)
            return null;
        else
            return singularObject.toString();
    }

    @Override
    public BigDecimal getSingularObjectFromString(final String string) throws FieldValidationException {
        System.out.println("getSingularObjectFromString 4");
        System.out.println(string);
        if (string == null)
            return null;
        try {
            BigDecimal decimal = new BigDecimal(string);
            if (decimal.scale() > 2) {
                throw new FieldValidationException(
                        "Maximum of 2 decimal places are allowed.");
            }
            return decimal.setScale(2);
        } catch (NumberFormatException ex) {
            throw new FieldValidationException("Not a valid number.");
        }
    }

    @Override
    protected PersistenceFieldType getDatabaseType() {
        System.out.println("getDatabaseType 2");
        System.out.println(PersistenceFieldType.TYPE_LIMITED_TEXT);
        return PersistenceFieldType.TYPE_LIMITED_TEXT;
    }

    @Override
    protected BigDecimal getObjectFromDbValue(final Object databaseValue)
            throws FieldValidationException {
        System.out.println("getObjectFromDbValue 3");
        System.out.println(databaseValue);
        return getSingularObjectFromString((String) databaseValue);
    }

    @Override
    protected Object getDbValueFromObject(final BigDecimal customFieldObject) {
        System.out.println("getDbValueFromObject 5");
        System.out.println(customFieldObject);
        return getStringFromSingularObject(customFieldObject);
    }
}