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diff --git a/srcjar_unused/org/apache/log4j/spi/ThrowableInformation.java b/srcjar_unused/org/apache/log4j/spi/ThrowableInformation.java
new file mode 100644
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+++ b/srcjar_unused/org/apache/log4j/spi/ThrowableInformation.java
@@ -0,0 +1,96 @@
+/*
+ * 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
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * 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 java.io.Serializable {
+
+  static final long serialVersionUID = -4748765566864322735L;
+
+  private transient Throwable throwable;
+  private transient Category category;
+  private String[] rep;
+
+  public
+  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();
+      }
+  }
+
+
+  public
+  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();
+  }
+}
+
+