When using the java client, the jsReportService getTemplate service the response is always null.
In the getTemplate request response, the template value is in the list of values ​​as well as in the listTemplates, but as you can see in the jsReportService it is taken from the template attribute.

public Template getTemplate(String id) throws JsReportException {
    return ((GetTemplateResponse)processSyncCall(this.jsreportRetrofitService.getTemplate(id)).body()).getTemplate();
}

public List<Template> listTemplates() throws JsReportException {
    return ((ListTemplateResponse)processSyncCall(this.jsreportRetrofitService.listTemplates()).body()).getValue();
}