Source Code for Apache Log4j 1.2.17

Apache Log4j provides the interface that applications should code to and provides the adapter components required for implementers to create a logging implementation.

Bytecode (Java 1.4) for Apache Log4j is provided in a JAR file like log4j-1.2.17.jar.

Source Code files for Apache Log4j are provided in both binary packge like and source package like You can download them at Apache Log4j Website.

You can also browse Source Code files for Apache Log4j 1.2.17 below.



 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.log4j.spi;

import org.apache.log4j.Category;
import org.apache.log4j.DefaultThrowableRenderer;

  * ThrowableInformation is log4j's internal representation of
  * throwables. It essentially consists of a string array, called
  * 'rep', where the first element, that is rep[0], represents the
  * string representation of the throwable (i.e. the value you get
  * when you do throwable.toString()) and subsequent elements
  * correspond the stack trace with the top most entry of the stack
  * corresponding to the second entry of the 'rep' array that is
  * rep[1].
  * @author Ceki Gülcü
  * */
public class ThrowableInformation implements {

  static final long serialVersionUID = -4748765566864322735L;

  private transient Throwable throwable;
  private transient Category category;
  private String[] rep;

  ThrowableInformation(Throwable throwable) {
    this.throwable = throwable;

     * Create a new instance.
     * @param throwable throwable, may not be null.
     * @param category category used to obtain ThrowableRenderer, may be null.
     * @since 1.2.16
  public ThrowableInformation(Throwable throwable, Category category) {
      this.throwable = throwable;
      this.category = category;

     * Create new instance.
     * @since 1.2.15
     * @param r String representation of throwable.
  public ThrowableInformation(final String[] r) {
      if (r != null) {
        rep = (String[]) r.clone();

  Throwable getThrowable() {
    return throwable;

  public synchronized String[] getThrowableStrRep() {
    if(rep == null) {
      ThrowableRenderer renderer = null;
      if (category != null) {
          LoggerRepository repo = category.getLoggerRepository();
          if (repo instanceof ThrowableRendererSupport) {
              renderer = ((ThrowableRendererSupport) repo).getThrowableRenderer();
      if (renderer == null) {
          rep = DefaultThrowableRenderer.render(throwable);
      } else {
          rep = renderer.doRender(throwable);
    return (String[]) rep.clone();



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2015-12-14, 29178👍, 0💬