{"record":{"id":"65c37c36b64504a1","repo":"stanfordnlp/CoreNLP","slug":"could-not-set-option-entry-getkey-no-such-f","errorCode":null,"errorMessage":"Could not set option: ${entry.getKey()}; no such field: ${fieldName} in class: ${className}","messagePattern":"Could not set option: (.+?); no such field: (.+?) in class: (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"src/edu/stanford/nlp/util/ArgumentParser.java","lineNumber":458,"sourceCode":"          err(\"Unrecognized option: \" + key);\n          continue;\n        }\n        if (!rawKeyStr.startsWith(\"log.\")) {  // ignore Redwood options\n          String className = rawKeyStr.substring(0, lastDotIndex);\n          // get the class\n          Class clazz = null;\n          try {\n            clazz = ClassLoader.getSystemClassLoader().loadClass(className);\n          } catch (Exception e) {\n            err(\"Could not set option: \" + entry.getKey() + \"; either the option is mistyped, not defined, or the class \" + className + \" does not exist.\");\n          }\n          // get the field\n          if (clazz != null) {\n            String fieldName = rawKeyStr.substring(lastDotIndex + 1);\n            try {\n              target = clazz.getField(fieldName);\n            } catch (Exception e) {\n              err(\"Could not set option: \" + entry.getKey() + \"; no such field: \" + fieldName + \" in class: \" + className);\n            }\n            if (target != null) {\n              log(\"option overrides \" + target + \" to '\" + value + '\\'');\n              fillField(class2object.get(target.getDeclaringClass()), target, value);\n            } else {\n              err(\"Could not set option: \" + entry.getKey() + \"; no such field: \" + fieldName + \" in class: \" + className);\n            }\n          }\n        }\n      }\n    }\n\n    //--Ensure Required\n    boolean good = true;\n    for (Map.Entry<String, Pair<Boolean, Boolean>> entry : required.entrySet()) {\n      String key = entry.getKey();\n      Pair<Boolean, Boolean> mark = entry.getValue();\n      if (mark.first && !mark.second) {","sourceCodeStart":440,"sourceCodeEnd":476,"githubUrl":"https://github.com/stanfordnlp/CoreNLP/blob/1b7edd19c4d0d7b1f13a2591425b9b60a0b1af7a/src/edu/stanford/nlp/util/ArgumentParser.java#L440-L476","documentation":"After the class resolves, ArgumentParser calls clazz.getField(fieldName) to locate the option field; if no such public field exists it logs this err() message. A second identical message is logged later if target is still null.","triggerScenarios":"Key 'some.Class.foo=x' where Class loads but has no public field named 'foo' (typo, non-public field, renamed field).","commonSituations":"Upgrading CoreNLP and referencing fields that were renamed/removed; writing lowercase/uppercase mismatch in field names; pointing at a class that was never a valid options holder.","solutions":["Check the exact public field name on the target class (Java is case-sensitive) and correct the key","Only public static fields declared with @Argument can be filled; make sure the field qualifies","Consult the target class source/javadoc for valid option names","Remove the stale key if the option no longer exists"],"exampleFix":"// before\nedu.stanford.nlp.pipeline.StanfordCoreNLP.maxSentenceLenght=100  // typo\n// after\nedu.stanford.nlp.pipeline.StanfordCoreNLP.maxSentenceLength=100","handlingStrategy":"validation","validationCode":"int dot = key.lastIndexOf('.');\nClass<?> c = Class.forName(key.substring(0, dot));\nString field = key.substring(dot + 1);\nboolean ok = java.util.Arrays.stream(c.getFields())\n    .anyMatch(f -> f.getName().equals(field));\nif (!ok) throw new IllegalArgumentException(\"no such option field: \" + key);","typeGuard":null,"tryCatchPattern":"try {\n  ArgumentParser.fillOptions(cls, props, true);\n} catch (RuntimeException e) {\n  log.error(\"invalid option field: \" + e.getMessage());\n}","preventionTips":["Copy field names directly from class source/javadoc, never by memory","Remember Java field-name case sensitivity","Only target public static option fields","Re-check keys after upgrading the library (fields get renamed)"],"tags":["java","configuration","reflection","typo"],"backgroundTag":"resource-not-found","analyzedSha":"1b7edd19c4d0d7b1f13a2591425b9b60a0b1af7a","analyzedAt":"2026-09-10T02:24:07.274Z","contentChangedAt":"2026-09-10T02:24:07.274Z","schemaVersion":2},"datasetVersion":"2026-09-17T15:17:12.973Z"}