A simple framework to export Jira issues, work log and change log.
java -jar jira-export-jar-with-dependencies.jar jira-instance-url project user password true/false true/falsefirst true/false flag is used to export work log or not
second true/false flag is used to export change log or not
Using this approach you will be able to export nearly all Jira data, you simply have to extend the used classes with attributes from Jira API documentation.
https://medium.com/@robertdiers/the-coffee-break-statement-using-the-jira-api-76007e0713e0