{"record":{"id":"e209f8b5130a860a","repo":"apache/hadoop","slug":"taskid-string-str-is-not-properly-formed","errorCode":null,"errorMessage":"TaskId string : {str} is not properly formed","messagePattern":"TaskId string : (.+?) is not properly formed","errorType":"exception","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JVMId.java","lineNumber":171,"sourceCode":"  public static JVMId forName(String str) \n    throws IllegalArgumentException {\n    if(str == null)\n      return null;\n    try {\n      String[] parts = str.split(\"_\");\n      if(parts.length == 5) {\n        if(parts[0].equals(JVM)) {\n          boolean isMap = false;\n          if(parts[3].equals(\"m\")) isMap = true;\n          else if(parts[3].equals(\"r\")) isMap = false;\n          else throw new Exception();\n          return new JVMId(parts[1], Integer.parseInt(parts[2]),\n              isMap, Integer.parseInt(parts[4]));\n        }\n      }\n    }catch (Exception ex) {//fall below\n    }\n    throw new IllegalArgumentException(\"TaskId string : \" + str \n        + \" is not properly formed\");\n  }\n\n}\n","sourceCodeStart":153,"sourceCodeEnd":176,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JVMId.java#L153-L176","documentation":"Error \"TaskId string : {str} is not properly formed\" thrown in apache/hadoop.","triggerScenarios":"Thrown at hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JVMId.java:171 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Pass a properly formed task ID string (e.g. task_<jtIdentifier>_<jobId>_<m|r>_<taskId>) when constructing the JVMId."],"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":"2026-08-23T01:17:44.959Z"}