TestNG by default disables loading DTD from unsecure Urls

While executing TestNG sometime we hit below error:

org.testng.TestNGException: 
TestNG by default disables loading DTD from unsecure Urls. If you need to explicitly load the DTD from a http url, please do so by using the JVM argument [-Dtestng.dtd.http=true]
    at org.testng.xml.TestNGContentHandler.resolveEntity(TestNGContentHandler.java:102) This can be sol;ved using 3 ways. 1. First and ideal way is to use https url in TestNGXML.It should be like:

1. Very first and ideal way is to use https URL in TestNG.xml file. <!DOCTYPE suite SYSTEM “https://testng.org/testng-1.0.dtd”>
   instead of <!DOCTYPE suite SYSTEM “http://testng.org/testng-1.0.dtd”>
2. Second way is to update Run Configuration and add VM argument -ea -Dtestng.dtd.http=true:

3. Third way is to update the eclipse TestNG Preferences