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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.spi;

import java.io.Serializable;

public class StackTraceElementProxy implements Serializable {

    private static final long serialVersionUID = -2374374378980555982L;

    final StackTraceElement ste;
    // save a byte or two during serialization, as we can
    // reconstruct this field from 'ste'
    transient private String steAsString;
    private ClassPackagingData cpd;

    public StackTraceElementProxy(StackTraceElement ste) {
        if (ste == null) {
            throw new IllegalArgumentException("ste cannot be null");
        }
        this.ste = ste;
    }

    public String getSTEAsString() {
        if (steAsString == null) {
            steAsString = "at " + ste.toString();
        }
        return steAsString;
    }

    public StackTraceElement getStackTraceElement() {
        return ste;
    }

    public void setClassPackagingData(ClassPackagingData cpd) {
        if (this.cpd != null) {
            throw new IllegalStateException("Packaging data has been already set");
        }
        this.cpd = cpd;
    }

    public ClassPackagingData getClassPackagingData() {
        return cpd;
    }

    @Override
    public int hashCode() {
        return ste.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        final StackTraceElementProxy other = (StackTraceElementProxy) obj;

        if (!ste.equals(other.ste)) {
            return false;
        }
        if (cpd == null) {
            if (other.cpd != null) {
                return false;
            }
        } else if (!cpd.equals(other.cpd)) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return getSTEAsString();
    }
}