Jira Java Rest Client: Get IssueLinks from issue - java

I'm implementing a tool with the JIRA Javs Rest Client. I perform a query to get all issues which are overdued. After this I would like to check, whether each of them is a child of any other issue.
Problem: I cannot find any solution to get the issue links
I tried to get the field "issuelinks" by:
issue.getField("issuelinks");
and also tried to use the method:
getIssueLinks()
I also read about an IssueLinkManager but it seems that I cannot import that library as I cannot find the correct maven repository for that.
I also tried to use an adapted JQL query but couldn't find a solution to search for issues without parent issues.
I would really appreciate if anyone could help me.
Thank you in advance!

This code works for me:
Issue i = client.getIssueClient().getIssue("XX-1000").claim();
for(IssueLink il : i.getIssueLinks()){
System.out.println(il);
}
Prints:
IssueLink{targetIssueKey=XX-1000, targetIssueUri=xxx, issueLinkType=IssueLinkType{name=Duplicate, description=duplicates, direction=OUTBOUND}}
What happens when you try it?
This API works fine, but has no documentation whatsoever. I am using version 4.0.0.

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