ExceptionUtil.java

package com.aventstack.extentreports.utils;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ExceptionUtil {
    
    private ExceptionUtil() { }
    
    public static String getStackTrace(Throwable t) {
        if (t == null)
            return null;
    
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        t.printStackTrace(pw);
        return sw.toString();
    }
    
    public static String getExceptionHeadline(Throwable t) {
        Pattern pattern = Pattern.compile("([\\w\\.]+)(:.*)?");
        String stackTrace = getStackTrace(t);
        Matcher matcher = pattern.matcher(stackTrace);
        
        if (matcher.find())
            return matcher.group(1);

        return null;
    }
}