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diff --git a/srcjar_unused/org/apache/log4j/DefaultThrowableRenderer.java b/srcjar_unused/org/apache/log4j/DefaultThrowableRenderer.java
new file mode 100644
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+++ b/srcjar_unused/org/apache/log4j/DefaultThrowableRenderer.java
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+/*
+ * 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;
+
+import org.apache.log4j.spi.ThrowableRenderer;
+
+import java.io.StringWriter;
+import java.io.PrintWriter;
+import java.io.LineNumberReader;
+import java.io.StringReader;
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.util.ArrayList;
+
+/**
+ * Default implementation of ThrowableRenderer using
+ * Throwable.printStackTrace.
+ *
+ * @since 1.2.16
+ */
+public final class DefaultThrowableRenderer implements ThrowableRenderer {
+    /**
+     * Construct new instance.
+     */
+    public DefaultThrowableRenderer() {
+
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public String[] doRender(final Throwable throwable) {
+        return render(throwable);
+    }
+
+    /**
+     * Render throwable using Throwable.printStackTrace.
+     * @param throwable throwable, may not be null.
+     * @return string representation.
+     */
+    public static String[] render(final Throwable throwable) {
+        StringWriter sw = new StringWriter();
+        PrintWriter pw = new PrintWriter(sw);
+        try {
+            throwable.printStackTrace(pw);
+        } catch(RuntimeException ex) {
+        }
+        pw.flush();
+        LineNumberReader reader = new LineNumberReader(
+                new StringReader(sw.toString()));
+        ArrayList lines = new ArrayList();
+        try {
+          String line = reader.readLine();
+          while(line != null) {
+            lines.add(line);
+            line = reader.readLine();
+          }
+        } catch(IOException ex) {
+            if (ex instanceof InterruptedIOException) {
+                Thread.currentThread().interrupt();
+            }
+            lines.add(ex.toString());
+        }
+        String[] tempRep = new String[lines.size()];
+        lines.toArray(tempRep);
+        return tempRep;
+    }
+}