Tom Wieczorek created LOG4J2-295:
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Summary: BufferOverflowException in FastFileManager when logging
huge messages
Key: LOG4J2-295
URL: https://issues.apache.org/jira/browse/LOG4J2-295
Project: Log4j 2
Issue Type: Bug
Components: Appenders
Affects Versions: 2.0-beta7
Reporter: Tom Wieczorek
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*
{noformat}
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);
}
}
{noformat}
----
*log4j2.xml*
{noformat}
<?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>
{noformat}
----
*Exception thrown*
{noformat}
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
{noformat}
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