CatalogJanitorReport getReport() {
    if (!this.closed) {
      throw new RuntimeException("Report not ready until after close()");
    }
    return this.report;
  }
Do not call until after {@link #close()}. Will throw a {@link RuntimeException} if you do.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/janitor/ReportMakingVisitor.java