Instance method are methods that are specific to particular classes. Instance methods are declared and defined followed by - (minus) symbol.
Class methods can be called by class name itself .Class methods are declared and defined by using + (plus)sign .
For starting a JIRA test instance on a local machine, the Atlassian-SDK is the way to go. This is useful for testing JIRA itself, developing and debugging JIRA plugins. The SDK is available for Windows, Linux and Mac.
See the installation guide for the Atlassian SDK. For running the Atlassian SDK properly, the Oracle Java SE Development Kit 8 (JDK) has to be installed - OpendJDK does not work!