{"record":{"id":"b609aeef3113c901","repo":"apache/hadoop","slug":"groupstr-does-not-match-expected-pattern","errorCode":null,"errorMessage":"'\" + groupStr + \"' does not match expected pattern for group","messagePattern":"'\" \\+ groupStr \\+ \"' does not match expected pattern for group","errorType":"validation","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FsShellPermissions.java","lineNumber":209,"sourceCode":"  }\n\n  /**\n   * Used to change group of files \n   */\n  public static class Chgrp extends Chown {\n    public static final String NAME = \"chgrp\";\n    public static final String USAGE = \"[-R] GROUP PATH...\";\n    public static final String DESCRIPTION =\n      \"This is equivalent to -chown ... :GROUP ...\";\n\n    static private final Pattern chgrpPattern = \n      Pattern.compile(\"^\\\\s*(\" + allowedChars + \"+)\\\\s*$\");\n\n    @Override\n    protected void parseOwnerGroup(String groupStr) {\n      Matcher matcher = chgrpPattern.matcher(groupStr);\n      if (!matcher.matches()) {\n        throw new IllegalArgumentException(\n            \"'\" + groupStr + \"' does not match expected pattern for group\");\n      }\n      owner = null;\n      group = matcher.group(1);\n    }\n  }\n}\n","sourceCodeStart":191,"sourceCodeEnd":217,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FsShellPermissions.java#L191-L217","documentation":"Error \"'\" + groupStr + \"' does not match expected pattern for group\" thrown in apache/hadoop.","triggerScenarios":"Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FsShellPermissions.java:209 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Provide a valid group name containing only allowed characters.","Verify the group exists on the system (getent group)."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2add9630210752f88ceb1bb74eb65e37bf41da8e","analyzedAt":"2026-08-22T19:55:07.957Z","schemaVersion":2},"datasetVersion":"2026-08-22T20:17:22.307Z"}