http://www.dropwizard.io/2.0.18/dropwizard-bom/dropwizard-dependencies/dropwizard-parent/dropwizard-logging: Dropwizard is a Java framework for developing ops-friendly, high-performance, RESTful web applications.
  • Coda Hale
  • Nick Telford
  • Graham O'Regan
  • Ryan Kennedy
  • Camille Fournier
  • Carlo Barbara
  • Matt Veitas
  • Ryan Tenney
  • Jochen Schalanda
  • Glenn McAllister
  • Nick Babcock
  • Justin Plock
  • Artem Prigoda 
package io.dropwizard.logging;

import ch.qos.logback.classic.pattern.ThrowableProxyConverter;
import ch.qos.logback.classic.spi.IThrowableProxy;

import java.util.regex.Pattern;


A ThrowableProxyConverter which prefixes stack traces with !. 
/**
 * A {@link ThrowableProxyConverter} which prefixes stack traces with {@code !}.
 */
public class PrefixedThrowableProxyConverter extends ThrowableProxyConverter {

    static final Pattern PATTERN = Pattern.compile("^\\t?", Pattern.MULTILINE);
    static final String PREFIX = "! ";

    @Override
    protected String throwableProxyToString(IThrowableProxy tp) {
        return PATTERN.matcher(super.throwableProxyToString(tp)).replaceAll(PREFIX);
    }
}