如何在自定義異常中打印堆棧跟蹤？

Question

我定義了一個自定義異常，像這樣：

package source.exception; 

import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 

public class ValidationException extends Exception 
{ 
    private static final Logger logger = LoggerFactory.getLogger("source.exception.ValidationException"); 

    public ValidationException(String message) 
    { 
     super(message); 
     ValidationException e = new ValidationException(); 
     logger.error("Exception : {}" , e); 
    } 
} 

在我使用這個例外，像這樣的主程序：

public void readFile(String path) throws ValidationException 
    { 
     logger.debug("Input file path = {}" , path); 
     try 
     { 
      if(validatePath(path)) 
      { 
       mathExpressionReader = new BufferedReader(new FileReader(path)); 
      } 
      else 
      { 
       throw new ValidationException("Your file dose not exist!"); 
      } 
     } 
     catch(Exception ex) 
     { 
      logger.error("Exception {} has occurred" , ex); 
     } 
    } 

現在我不知道如何打印堆棧跟蹤時validatePath失敗（意味着如果語句變爲false）。任何人都可以幫助我在自定義異常中打印堆棧跟蹤？

Answer 1

爲什麼不只是使用e.printStackTrace()？

public class ValidationException extends Exception 
{ 
    public ValidationException(String message) 
    { 
     super(message); 
    } 
} 

public void readFile(String path) throws ValidationException 
{ 
    logger.debug("Input file path = {}" , path); 
    try 
    { 
     if(validatePath(path)) 
     { 
      mathExpressionReader = new BufferedReader(new FileReader(path)); 
     } 
     else 
     { 
      throw new ValidationException("Your file dose not exist!"); 
     } 
    } catch (ValidationException e) { 
     // This will print the stack trace. 
     e.printStackTrace(); 
    } 
}