What is the mistake in my code...?

Question about the task

Catching custom exceptions

Java Syntax, Level 9, Lesson 8

Resolved

I'm trying to rethrow the exception but it doesn't compile by saying exception must be caught or declared to be thrown.

1. Analyze the exceptions thrown by the BEAN.throwExceptions method.
2. The handleExceptions method must call the BEAN.throwExceptions method and handle exceptions:
2.1. if there is a FileSystemException, then log it (call the BEAN.log method) and rethrow
2.2. if there is a CharConversionException or any other IOException, then just log it (call the BEAN.log method)
3. Add to the handleExceptions method signature the exception class you throw in Item 2.1.
4. In the main method, handle the remaining exception by logging it. Use try-catch

Hint:
If you capture a MyException and you didn't want to catch it, you can rethrow it using code like:
catch (MyException e) { throw e; }

Requirements:

The handleExceptions method must call the BEAN.throwExceptions method.
The handleExceptions method should log the FileSystemException (call the BEAN.log method), and then rethrow it.
The handleExceptions method should only log (call the BEAN.log method) the CharConversionException.
The handleExceptions method should only log any IOException.
Add the FileSystemException class to the signature of the handleExceptions method.
The main method should use try-catch.
The main method should log the exceptions thrown by the handleExceptions method.

package com.codegym.task.task09.task0915; import java.io.CharConversionException; import java.io.IOException; import java.nio.file.FileSystemException; /* Catching custom exceptions */ public class Solution { public static StatelessBean BEAN = new StatelessBean(); public static void main(String[] args) { try{ handleExceptions(); } catch(Exception e){ BEAN.log(e); } } public static void handleExceptions() { try{ BEAN.throwExceptions(); } catch(FileSystemException e) { try{ BEAN.log(e); } catch(Exception me){ throw me; } } catch(Exception e){ BEAN.log(e); } } public static class StatelessBean { public void log(Exception exception) { System.out.println(exception.getMessage() + ", " + exception.getClass().getSimpleName()); } public void throwExceptions() throws CharConversionException, FileSystemException, IOException { int i = (int) (Math.random() * 3); if (i == 0) throw new CharConversionException(); if (i == 1) throw new FileSystemException(""); if (i == 2) throw new IOException(); } } }

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Jay

Level 17 , Washington, United States

30 July 2019, 17:19

Why was it necessary to add the throws FileSystemException to the handlesException method but we didn't have to include the other exceptions (i.e, CharConversionException, IOException)? From what I can see all three exceptions are in the called method "throwsExceptions()". So what's different about FIleSystemException?

Henk

Level 19 , Pretoria, South-Africa

6 May 2019, 07:59

Holy shite this was more difficult and confusing, lol!

Hashirama

Level 26 , Port-Harcourt, Nigeria

26 January 2019, 12:44

solution

LINE 24: add this: handleExceptions() throws FileSystemException LINE 30 THROUGH 33 Remove this: try{ BEAN.log(e); } catch(Exception me){ throw me; } And just log it, and then rethrow it simply by doing this: throw e;

Guadalupe Gagnon

Level 37 , Tampa, United States

20 January 2019, 17:31

#1 You don't need a try-catch block at lines 30-33. Remove that and just log and throw e. The method should also include throws FileSystemException because of this. #2 Your last catch (line 35) catches exception, this catches too much. It should catch IOException (which also included CharConversionException) Fix this.