I have been reading the documentation that is in the page about Atlassian Jira.
I want to simply create a class in Eclipse to connect to Jira using Rest and get the name of an issue.
What do I need to install? I downloaded a jar of this page.
If you are using Eclipse than it is simple. Download the m2e plugin (Help -> Install new software --> Work with --> "m2e plugin download link").
Then New -> Project ... -> Maven Project In pom.xml add:
<dependencies>
...
<dependency>
<groupId>com.atlassian.jira</groupId>
<artifactId>jira-rest-java-client</artifactId>
<version>Version of the library you use</version>
</dependency>
...
</dependencies>
And use what is needed from https://studio.atlassian.com/wiki/display/JRJC/Tutorial.
Or, if your only need is to get the issues name then you can make an HttpRequest to the REST url and parse the returned JSON. How a REST response looks like: https://jira.atlassian.com/rest/api/latest/issue/JRA-9
See: How to send HTTP request in java? , Decoding JSON format in Java