[LOG4J2-807] Disruptor is null when configuration is reloaded (asyncRoot + monitorInterval)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.2
• Fix Version/s: 2.1
• Assignee: Remko Popma
• Reporter: Florin Marinoiu
• Created: 29/Aug/14 15:00
• Updated: 30/Sep/14 14:50
• Resolved: 22/Sep/14 15:41

Description

We have a XML configuration with <asyncRoot> and monitorInterval. When the configuration file is reloaded I have a NPE and log4j become unavailable:

2014-08-29 10:39:59,079 ERROR Could not register mbeans java.lang.NullPointerException
	at org.apache.logging.log4j.core.async.AsyncLoggerConfigHelper.createRingBufferAdmin(AsyncLoggerConfigHelper.java:360)
	at org.apache.logging.log4j.core.async.AsyncLoggerConfig.createRingBufferAdmin(AsyncLoggerConfig.java:148)

Here is my config:

<?xml version="1.0" encoding="UTF-8"?>
<Configuration name="asynRootConfig" monitorInterval="5" status="debug">
    <Appenders>
        <RandomAccessFile name="FILE_APPENDER" fileName="application.log" immediateFlush="false" append="true">
            <PatternLayout>
                <Pattern>%d  %-5p [%c{1.}] %m%n</Pattern>
            </PatternLayout>
        </RandomAccessFile>
    </Appenders>
    <Loggers>
        <asyncRoot level="debug">
            <AppenderRef ref="FILE_APPENDER" />
        </asyncRoot>
    </Loggers>
</Configuration>

And a code snippet to reproduce:

public class Log4jAsyncRootReloadTest {

    public static void main(String[] args) throws InterruptedException {
        final File config = new File("./log4j2.xml");
        System.setProperty("log4j.configurationFile", "file://" + config.getAbsolutePath().replaceAll("\\\\", "/"));

        Logger logger = LogManager.getLogger(Log4jAsyncRootReloadTest.class);
        logger.info("Log4j configured, will be reconfigured in aprox. 5 sec");

        config.setLastModified(System.currentTimeMillis());

        for (int i = 0; i < 10; i++) {
            Thread.sleep(1000);
            logger.info("Log4j waiting for reconfiguration");
        }
    }
}

Issue Links

• supercedes: LOG4J2-392 Intermittent errors with appenders