| S.No |
Topic |
Sub-Topics |
| 1 | Introduction | Definition, Errors vs Exceptions, Exception flow, Why needed, Real-world examples |
| 2 | Exception Types | Checked, Unchecked, Errors, Runtime, Throwable hierarchy |
| 3 | try-catch Basics | Syntax, Single catch, Exception capture, Debugging, Execution flow |
| 4 | Multiple catch | Multiple catch block, Order, Specific vs Generic, Multi-catch Java 7, Best practices |
| 5 | finally Block | Execution guarantee, Use cases, Resource cleanup, Try-finally, Finally behavior |
| 6 | throw Keyword | Manual throwing, Use cases, Custom messages, Runtime behavior, Stack trace |
| 7 | throws Keyword | Method signature, Propagation, Checked declaration, Compile errors, Best use |
| 8 | Exception Propagation | Call stack, Propagation rules, try vs throws, Runtime behavior, Examples |
| 9 | Custom Exceptions | Create class, Extend Exception, Extend RuntimeException, Fields, Constructors |
| 10 | Exception Class Hierarchy | Throwable, Error, Exception, RuntimeException, Libraries |
| 11 | Common Exception Types | NullPointer, ArrayIndex, Arithmetic, IO, ClassCast |
| 12 | Stack Trace | Print stack trace, Logging stack trace, Trace format, Frames, Debugging |
| 13 | Best Practices | Avoid swallowing, Custom messages, Single responsibility, Fail fast, Graceful exit |
| 14 | Checked vs Unchecked | Difference, When to use, Design patterns, Pros/Cons, Standards |
| 15 | Resource Management | I/O exceptions, Close resources, try-catch-finally, Auto close, Patterns |
| 16 | Try-with-resources | Java 7 feature, AutoCloseable, Multiple resources, Suppressed exceptions, Syntax |
| 17 | Suppressed Exceptions | Meaning, Access suppressed, PrintStackTrace, Use cases, Resource conflict |
| 18 | Logging Basics | Why log, Log levels, Log format, Logger libraries, Writing log |
| 19 | Advanced Logging | SLF4J, Logback, Log4j, Pattern layout, Exception logging |
| 20 | Exception Translation | Mapping exceptions, Wrapping error, Abstraction, custom messages, Conversion |
| 21 | Global Exception Handling | Application-level handling, Default handlers, Hooks, Web apps, Spring global handler |
| 22 | Spring Exception Handling | @ExceptionHandler, @ControllerAdvice, Custom response, JSON errors, Logging |
| 23 | Unit Testing Exceptions | JUnit test, assertThrows, Expected exceptions, Boundary cases, Testing messages |
| 24 | Debugging Techniques | Breakpoints, Watches, IDE tools, Visual debug, Exception inspect |
| 25 | Design Patterns | Command pattern exceptions, Builder validation, Strategy fallback, Template hook, Fail-safe |
| 26 | Performance Considerations | Cost of exceptions, Avoid overuse, Try/catch slow paths, Control flow bad practice, Benchmarks |
| 27 | Enterprise Handling | API error model, Status codes, Error JSON, Unified error format, Standards |
| 28 | Exception Metrics | Monitoring, Counters, Failure rate, Alerting, Dashboard |
| 29 | Security & Exceptions | Leaking info, Sanitizing output, Stack trace risk, Error pages, Secure messages |
| 30 | Interview Prep | Top 20 questions, Live coding, Common traps, Custom design, Real project demo |
