Symptoms

When creating a new issue, the following error is thrown:

Error instantiating webwork.multipart.parser.class: com.atlassian.jira.web.JiraMultipartRequestWrapper(original message: null)

Cause

The /work and /tmp (/temp in Jira 8.2.3) directories in JIRA's installation directory may have incorrect permissions. You can validate that by checking if the directories are owned by the same user that is running JIRA.

Resolution

1. Shutdown JIRA;

2. Change the permissions to allow access for the user who starts the application for the two above directories. 

3. Start JIRA.