stanfordnlp/CoreNLP · error · RuntimeException
Error creating custom coref system
Error message
Error creating custom coref system
What it means
Wraps reflective instantiation failures in CorefAlgorithm.fromProps when loading a custom coref algorithm: ClassNotFoundException, NoSuchMethodException, or constructor/instantiation errors for the class named by coref.algorithm.class.
Solutions
- Check the class name spelling and that it is on the classpath
- Ensure the class has a public (Properties, Dictionaries) constructor
- Verify the class implements CorefAlgorithm
Defensive patterns
Strategy: try-catch
When it happens
Trigger: Thrown at src/edu/stanford/nlp/coref/CorefAlgorithm.java:45 when the library encounters an invalid state.
Common situations: See trigger scenarios.
AI-assisted analysis of stanfordnlp/CoreNLP@1b7edd19c4 (2026-09-10).
Data as JSON: /api/errors/2a4070403fc89fe4.
Report an issue: GitHub.
Appendix: source
Thrown at src/edu/stanford/nlp/coref/CorefAlgorithm.java:45
if (algorithm == CorefAlgorithmType.CLUSTERING) {
return new ClusteringCorefAlgorithm(props, dictionaries);
} else if (algorithm == CorefAlgorithmType.STATISTICAL) {
return new StatisticalCorefAlgorithm(props, dictionaries);
} else if (algorithm == CorefAlgorithmType.NEURAL) {
return new NeuralCorefAlgorithm(props, dictionaries);
} else if (algorithm == CorefAlgorithmType.FASTNEURAL) {
return new FastNeuralCorefAlgorithm(props, dictionaries);
} else if (algorithm == CorefAlgorithmType.CUSTOM) {
String classname = PropertiesUtils.getString(props, "coref.algorithm.class", null);
try {
if (classname != null) {
Class clazz = Class.forName(classname);
return (CorefAlgorithm) clazz.getConstructor(Properties.class, Dictionaries.class).newInstance(props, dictionaries);
} else {
throw new RuntimeException("Please specify coref.algorithm.class");
}
} catch (Exception e) {
throw new RuntimeException("Error creating custom coref system", e);
}
} else {
try {
return new HybridCorefSystem(props, dictionaries);
} catch (Exception e) {
throw new RuntimeException("Error creating hybrid coref system", e);
}
}
}
}
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