| Tokens, Literals & Delimiters: |
| - Missing semicolon after statement |
| - Missing opening curly brace |
| - Extraneous closing curly brace |
| - Missing closing curly brace |
| - Mismatched parentheses |
| - Mismatched brackets |
| - Unterminated or unquoted literal/comment |
| - Invalid escape in string literal |
| - Illegal character |
| - Invalid numeric literal |
| Expressions & Operators: |
| - Invalid assignment target |
| - Missing or misplaced separator (operator, dot, comma) |
| - Wrong operand types in operators |
| - Using math-notation as operator |
| - Using assignment instead of comparison in conditions |
| - Using and, or, not instead of &&, ||, ! |
| - Malformed expression or statement (unspecified) |
| Names & Scope: |
| - Using reserved words as identifiers |
| - Case-sensitivity errors |
| - Misspelled variable names |
| - Misspelled keywords |
| - Misspelled method names |
| - Misspelled class names |
| - Using undeclared variable identifier |
| - Calling undeclared method |
| - Out-of-scope variable identifier |
| - Member used as method or field |
| Declarations & Initialization: |
| - Invalid variable declaration |
| - Incorrect initialization syntax |
| - Duplicate declaration (variable/method/class) |
| - Using uninitialized variable |
| Types & Arrays: |
| - Incompatible type in assignment |
| - Incompatible type in return statement |
| - Invalid type casts |
| - Char and string mismatch |
| - Using primitive type as generic type argument |
| - Member access on a primitive value |
| - Array declaration or creation syntax |
| - Indexing a non-array or invalid array access |
| Methods & Constructors: |
| - Incorrect main method signature |
| - Invalid method declaration or override |
| - Calling method with wrong number of arguments |
| - Calling method with wrong type of arguments |
| - Missing return in method |
| - Invalid object creation (constructor or abstract class) |
| Classes, Objects & Access: |
| - Missing class definition |
| - Multiple public classes in one file |
| - Statement outside a method |
| - Illegal member access (static context or visibility) |
| - Invalid or misplaced modifier |
| Control Flow & Exceptions: |
| - While/do-while header syntax errors |
| - For header syntax errors |
| - Conditional statement errors (if/else/switch) |
| - Misplaced or unreachable control flow |
| - Exception handling errors (try/catch/throws) |
| Imports & Packages: |
| - Missing import |
| - Missing identifier after import |
| - Invalid import or package declaration |
| Input Quality & Fallback: |
| - Non-Java Code |
| - Unclassifiable |
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