如何在自定义异常中打印堆栈跟踪？

Question

I define a custom exception like so :

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);
    }
}

In the main program I use this exception like so :

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);
        }
    }

Now I don't know how to print stack trace when validatePath fail(means if statement become false) .Can anyone help me to print stack trace in custom exception?

Answer 1

Why not just using 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();
    }
}