{"record":{"id":"bc8e999304e2ebdc","repo":"apache/iceberg","slug":"failed-to-scan-delegate-parser-in-bc8e99","errorCode":null,"errorMessage":"Failed to scan delegate parser in {}: ","messagePattern":"Failed to scan delegate parser in (.+?): ","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"spark/v4.1/spark/src/main/java/org/apache/iceberg/spark/ExtendedParser.java","lineNumber":99,"sourceCode":"\n    return null;\n  }\n\n  private static ParserInterface getNextDelegateParser(ParserInterface parser) {\n    try {\n      Class<?> clazz = parser.getClass();\n      while (clazz != null) {\n        for (Field field : clazz.getDeclaredFields()) {\n          field.setAccessible(true);\n          Object value = field.get(parser);\n          if (value instanceof ParserInterface && value != parser) {\n            return (ParserInterface) value;\n          }\n        }\n        clazz = clazz.getSuperclass();\n      }\n    } catch (Exception e) {\n      log().warn(\"Failed to scan delegate parser in {}: \", parser.getClass().getName(), e);\n    }\n\n    return null;\n  }\n\n  private static Logger log() {\n    return LoggerFactory.getLogger(ExtendedParser.class);\n  }\n\n  List<RawOrderField> parseSortOrder(String orderString) throws AnalysisException;\n}\n","sourceCodeStart":81,"sourceCodeEnd":111,"githubUrl":"https://github.com/apache/iceberg/blob/86d9c8fc543e7c56c9f624eb725f76c9baff9570/spark/v4.1/spark/src/main/java/org/apache/iceberg/spark/ExtendedParser.java#L81-L111","documentation":"ExtendedParser scans a Spark parser object reflectively to locate a delegate ParserInterface (e.g. when wrapping Spark's parser for extensions). If reflection fails for any reason, the exception is swallowed and only a warning with the parser class name is logged, and the method returns null. Callers must handle the null delegate.","triggerScenarios":"findParser calls getNextDelegateParser against a parser whose class hierarchy/fields do not expose a ParserInterface in an expected way, or field access is blocked (module access restrictions, changed Spark internals).","commonSituations":"Spark version upgrades changing internal parser structure; JDK strong encapsulation blocking setAccessible on Spark internals; custom parser extensions that do not follow the standard delegate pattern.","solutions":["Verify the Spark/Iceberg versions are compatible (the extended parser matches the Spark internals version)","Check JDK module/access errors in the chained exception; add --add-opens for the relevant packages if encapsulation blocks reflection","If the warning is benign (parser has no delegate), rely on the null-return handling in the calling code"],"exampleFix":"// before\njava --add-opens=java.base/java.lang=ALL-UNNAMED\n// after\njava --add-opens=java.base/java.lang=ALL-UNNAMED \\\n     --add-opens=org.apache.spark.sql.catalyst/org.apache.spark.sql.catalyst.parser=ALL-UNNAMED","handlingStrategy":"fallback","validationCode":"// verify parser extension is present and Spark version matches the Iceberg connector\nSystem.out.println(spark.version());","typeGuard":"if (delegate == null) { /* fall back to the original parser instead of using the wrapper */ }","tryCatchPattern":null,"preventionTips":["Pin Iceberg connector version to the exact Spark minor version","Add --add-opens flags for Spark internals when on JDK 17+","Test custom parser extensions after Spark upgrades"],"tags":["spark","reflection","sql-parser","compatibility"],"backgroundTag":"deprecated-api-usage","analyzedSha":"86d9c8fc543e7c56c9f624eb725f76c9baff9570","analyzedAt":"2026-09-12T00:46:39.097Z","contentChangedAt":"2026-09-12T00:46:39.097Z","schemaVersion":2},"datasetVersion":"2026-09-14T16:17:12.679Z"}