How to create subtasks using JIRA REST Java Client

Question

Is there a way to create a subtask using JRJC v1.0? I've been unable to find any good documentation on this. Any sample codes out there?

It seems like it's not supported via the library but possible using straight REST API.

JIRA v5.1.5

Answer 1

I was able to put together the below code that worked.

    IssueInputBuilder issueBuilder = new IssueInputBuilder("Project1", 5L);//5 is the id for subtask type. You can know the id of subtask type by querying this REST api /rest/api/2/issue/createmeta
    issueBuilder.setDescription(">> Test Description");
    issueBuilder.setSummary("Test summary");
    issueBuilder.setProjectKey("Project1");
    Map<String, Object> parent = new HashMap<String, Object>();
    parent.put("key", "SOMEISSUE-234");
    FieldInput parentField = new FieldInput("parent", new ComplexIssueInputFieldValue(parent));

    Map<String, Object> customField = new HashMap<String, Object>();
    customField.put("value", "someValue");//This is some custom field value on the subtask
    customField.put("id", "12345");//This is the id of the custom field. You can know this by calling REST GET for a manually created sub-task

    issueBuilder.setFieldInput(parentField);
    issueBuilder.setFieldValue("customfield_12345",  new ComplexIssueInputFieldValue(customField));//here again you have to query an existing subtask to know the "customfield_*" value

    com.atlassian.jira.rest.client.domain.input.IssueInput issueInput = issueBuilder.build();
    BasicIssue bIssue = restClient.getIssueClient().createIssue(issueInput, pm);    
    System.out.println(">>> " + bIssue.getKey());