stanfordnlp/CoreNLP · warning · RuntimeIOException

RuntimeIOException wrapping IOException from close

Error message

RuntimeIOException wrapping IOException from close

What it means

TreeRecorder.display is the cleanup hook that closes the underlying BufferedWriter; a checked IOException during close is rethrown as RuntimeIOException. Close can fail when flushing buffered data to disk, so this error usually means earlier writes could not be fully persisted.

Solutions

1. Ensure adequate disk space before and during the recording run
2. Call display()/close() exactly once per TreeRecorder instance
3. Use try/finally so close is attempted and any RuntimeIOException is logged with context
4. Check the filesystem has not gone read-only (dmesg/mount output) if errors persist

Example fix

// before
recorder.display(verbose, pw);
// after
try {
  recorder.display(verbose, pw);
} catch (RuntimeIOException e) {
  System.err.println("Failed to close tree output: " + e.getMessage());
}

if (p.toFile().getUsableSpace() == 0) throw new IllegalStateException("disk full before close");

try {
  recorder.display(verbose, pw);
} catch (RuntimeIOException e) {
  log.warning("Error closing TreeRecorder: " + e.getMessage());
}

When it happens

Trigger: Calling recorder.display(verbose, pw) (which calls out.close()) when the output stream cannot be flushed — disk full, stream already closed/corrupted, or filesystem failure.

Common situations: Disk filled during evaluation so the final buffer flush fails; double-closing the recorder after a prior failure; container filesystem that has gone read-only.

Understand the failure class

Background: "failed to write file", "Could not save figure", "Error saving remote file" — file write failed: causes and fixes across languages and libraries — this error's family across 38 libraries.

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AI-assisted analysis of stanfordnlp/CoreNLP@1b7edd19c4 (2026-09-10). Data as JSON: /api/errors/62c8bdcee9af4ba2. Report an issue: GitHub.

Appendix: source

Thrown at src/edu/stanford/nlp/parser/shiftreduce/TreeRecorder.java:64

        out.write(srquery.getBestBinarizedParse().toString());
        break;
      case DEBINARIZED:
        out.write(srquery.debinarized.toString());
        break;
      default:
        throw new IllegalArgumentException("Unknown mode " + mode);
      }
      out.newLine();
    } catch (IOException e) {
      throw new RuntimeIOException(e);
    }
  }

  public void display(boolean verbose, PrintWriter pw) {
    try {
      out.close();
    } catch (IOException e) {
      throw new RuntimeIOException(e);
    }
  }
  
}

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