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diff --git a/unused/srcjar_unused/org/apache/log4j/helpers/OnlyOnceErrorHandler.java b/unused/srcjar_unused/org/apache/log4j/helpers/OnlyOnceErrorHandler.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.helpers;
+
+import org.apache.log4j.spi.ErrorHandler;
+import org.apache.log4j.spi.LoggingEvent;
+import org.apache.log4j.Logger;
+import org.apache.log4j.Appender;
+
+import java.io.InterruptedIOException;
+
+/**
+
+ The OnlyOnceErrorHandler
implements log4j's default
+ error handling policy which consists of emitting a message for the
+ first error in an appender and ignoring all following errors.
+
+
The error message is printed on System.err
.
+
+
This policy aims at protecting an otherwise working application
+ from being flooded with error messages when logging fails.
+
+ @author Ceki Gülcü
+ @since 0.9.0 */
+public class OnlyOnceErrorHandler implements ErrorHandler {
+
+
+ final String WARN_PREFIX = "log4j warning: ";
+ final String ERROR_PREFIX = "log4j error: ";
+
+ boolean firstTime = true;
+
+
+ /**
+ Does not do anything.
+ */
+ public
+ void setLogger(Logger logger) {
+ }
+
+
+ /**
+ No options to activate.
+ */
+ public
+ void activateOptions() {
+ }
+
+
+ /**
+ Prints the message and the stack trace of the exception on
+ System.err
. */
+ public
+ void error(String message, Exception e, int errorCode) {
+ error(message, e, errorCode, null);
+ }
+
+ /**
+ Prints the message and the stack trace of the exception on
+ System.err
.
+ */
+ public
+ void error(String message, Exception e, int errorCode, LoggingEvent event) {
+ if (e instanceof InterruptedIOException || e instanceof InterruptedException) {
+ Thread.currentThread().interrupt();
+ }
+ if(firstTime) {
+ LogLog.error(message, e);
+ firstTime = false;
+ }
+ }
+
+
+ /**
+ Print a the error message passed as parameter on
+ System.err
.
+ */
+ public
+ void error(String message) {
+ if(firstTime) {
+ LogLog.error(message);
+ firstTime = false;
+ }
+ }
+
+ /**
+ Does not do anything.
+ */
+ public
+ void setAppender(Appender appender) {
+ }
+
+ /**
+ Does not do anything.
+ */
+ public
+ void setBackupAppender(Appender appender) {
+ }
+}