How To Generate package.xml Through ANT Tool and Change Sets

Prerequisites: Force.com Migration Tool [ANT]. This is one of the popular deployment tools used for migrating Salesforce metadata from one org/sandbox to another. Check this link for Installation details if you don’t already have Force.com Migration Tool. https://developer.salesforce.com/docs/atlas.en-us.daas.meta/daas/forcemigrationtool_install.htm

Go to Setup and create a Change Set in your sandbox. You cannot test this feature with Developer edition since Developer edition doesn’t come with any sandboxes

<project name="Salesforce Retrieval Package" default="" basedir="." xmlns:sf="antlib:com.salesforce"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="antlib:com.salesforce">

<input message="${promptMessage}"

validargs="y,n"

addproperty="do.delete"

</condition>

<fail if="do.abort">Build aborted by user.</fail>

</target>

<or>

</or>

</condition>

<input message="Please enter the name of the change set:"

addproperty="source.changeSetName"

<property name="promptMessage" value="Are you sure you want to retrieve a change set from the following org?${line.separator}

salesforceUrl: ${salesforceUrl}${line.separator}

username: ${username}${line.separator}

changeSet: ${source.changeSetName}${line.separator}

folder: @{folder}${line.separator}" />

<sf:retrieve username="${username}"

password="${password}"

serverurl="${salesforceUrl}"

maxPoll="${maxPoll}"

retrieveTarget="@{folder}"

packageNames="${source.changeSetName}" />

</sequential>

</macrodef>

<retrieve-cs folder="changeSet" />

</target>

</project>

Above code has operation called ‘retrieve-cs’, that retrieves Change Set components from your Sandbox. Make sure username and password variables in build.properties are same as in build.xml
Run ‘ant retrieve-cs’ command in command prompt/terminal. Enter the change set name when prompted and confirm the operation. Script should create a new folder called changeSet and stashes the components from Change Set in to the same. If everything is okay, you should see that build is successful like below