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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.pattern;

import ch.qos.logback.classic.spi.IThrowableProxy;
import ch.qos.logback.classic.spi.ThrowableProxyUtil;
import ch.qos.logback.core.CoreConstants;

/**
 * @author Tomasz Nurkiewicz
 * @since 0.9.30
 */
public class RootCauseFirstThrowableProxyConverter extends ExtendedThrowableProxyConverter {

    @Override
    protected String throwableProxyToString(IThrowableProxy tp) {
        StringBuilder buf = new StringBuilder(BUILDER_CAPACITY);
        recursiveAppendRootCauseFirst(buf, null, ThrowableProxyUtil.REGULAR_EXCEPTION_INDENT, tp);
        return buf.toString();
    }

    protected void recursiveAppendRootCauseFirst(StringBuilder sb, String prefix, int indent, IThrowableProxy tp) {
        if (tp.getCause() != null) {
            recursiveAppendRootCauseFirst(sb, prefix, indent, tp.getCause());
            prefix = null; // to avoid adding it more than once
        }
        ThrowableProxyUtil.indent(sb, indent - 1);
        if (prefix != null) {
            sb.append(prefix);
        }
        ThrowableProxyUtil.subjoinFirstLineRootCauseFirst(sb, tp);
        sb.append(CoreConstants.LINE_SEPARATOR);
        subjoinSTEPArray(sb, indent, tp);
        IThrowableProxy[] suppressed = tp.getSuppressed();
        if (suppressed != null) {
            for (IThrowableProxy current : suppressed) {
                recursiveAppendRootCauseFirst(sb, CoreConstants.SUPPRESSED, indent + ThrowableProxyUtil.SUPPRESSED_EXCEPTION_INDENT, current);
            }
        }
    }
}