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  1. Log4j 2
  2. LOG4J2-295

BufferOverflowException in FastFileManager when logging huge messages

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 2.0-beta7
    • 2.0-beta8
    • Appenders
    • None

    Description

      When logging messages larger than FastFileManager.DEFAULT_BUFFER_SIZE with appenders using FastFileManager, the logging fails internally with a BufferOverflowException and no log output is produced by these appenders.


      Test case

      import java.util.Arrays;
      
      import org.apache.logging.log4j.LogManager;
      
      public class TestBufferOverflow {
      
        public static void main(String[] args) {
      
          final String longMessage;
          {
            char[] chars = new char[384 * 1024];
            Arrays.fill(chars, 'x');
            longMessage = new String(chars);
          }
      
          LogManager.getLogger("TestBufferOverflow").info(longMessage);
        }
      }
      

      log4j2.xml

      <?xml version="1.0" encoding="UTF-8"?>
      <configuration>
        <appenders>
          <FastFile name="file" fileName="test.log" suppressExceptions="false">
            <PatternLayout>
              <pattern>%m%n</pattern>
            </PatternLayout>
          </FastFile>
        </appenders>
        <loggers>
          <root level="info">
            <appender-ref ref="file" />
          </root>
        </loggers>
      </configuration>
      

      Exception thrown

      Exception in thread "main" org.apache.logging.log4j.core.appender.AppenderRuntimeException: An exception occurred processing Appender file
      	at org.apache.logging.log4j.core.appender.DefaultErrorHandler.error(DefaultErrorHandler.java:73)
      	at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:104)
      	at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:424)
      	at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:405)
      	at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:366)
      	at org.apache.logging.log4j.core.Logger.log(Logger.java:110)
      	at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1010)
      	at TestBufferOverflow.main(TestBufferOverflow.java:16)
      Caused by: java.nio.BufferOverflowException
      	at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:165)
      	at org.apache.logging.log4j.core.appender.FastFileManager.write(FastFileManager.java:89)
      	at org.apache.logging.log4j.core.appender.OutputStreamManager.write(OutputStreamManager.java:129)
      	at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:113)
      	at org.apache.logging.log4j.core.appender.FastFileAppender.append(FastFileAppender.java:84)
      	at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:102)
      	... 6 more
      

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            rpopma Remko Popma
            tom@bibbu.net Tom Wieczorek
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              Updated:
              Resolved:

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