Daisuke Baba created LOG4J2-462:
-----------------------------------
Summary: LevelPatternConverter.format may throw NPE
Key: LOG4J2-462
URL: https://issues.apache.org/jira/browse/LOG4J2-462
Project: Log4j 2
Issue Type: Bug
Components: Core
Affects Versions: 2.0-beta9
Environment: java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)
Reporter: Daisuke Baba
I found an issue when enabling asynchronous appenders with
`-DLog4jContextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector`
and I also got a workaround to fix it.
Note that I invoke LogContext.setConfigLocation() then LogContext.reconfigure()
in order to apply log4j2.xml programatically.
1. Stacktrace ... See the bottom of the Description as it is a large portion.
2. Workaround
Just to get rid of toString() at line 123 from the following snippet:
{code:title=2.0-beta-9.org.apache.logging.log4j.core.pattern.LevelPatternConverter.java|borderStyle=solid}
122 public void format(final LogEvent event, final StringBuilder output) {
123 output.append(levelMap == null ? event.getLevel().toString() :
levelMap.get(event.getLevel()));
124 }
{code}
The workaround is as follows:
{code:title=MyWorkaround|borderStyle=solid}
122 public void format(final LogEvent event, final StringBuilder output) {
123 output.append(levelMap == null ? event.getLevel() :
levelMap.get(event.getLevel()));
124 }
{code}
3. Log4j2.xml
{code:title=log4j2.xml snip|borderStyle=solid}
<RollingRandomAccessFile name="MySizeRollingLog"
fileName="foo.log"
filePattern="foo-%d{MM-dd-yyyy}-%i.log.gz">
<PatternLayout
pattern="%d{yyyy-MM-dd HH:mm:ss,SSS z} %-5p
[%t] (%F:%L) - [server($${sys:something})]-[%X{Something}]-%m%n" />
<Policies>
<TimeBasedTriggeringPolicy interval="1"
modulate="true" />
<SizeBasedTriggeringPolicy size="1000KB" />
</Policies>
<DefaultRolloverStrategy max="3" />
</RollingRandomAccessFile>
{code}
I'm not sure why event.getLevel() was null but the workaround works for me.
----
Full stacktrace:
2013-12-05 09:36:58,947 ERROR An exception occurred processing Appender
MySizeRollingLog java.lang.NullPointerException
at
org.apache.logging.log4j.core.pattern.LevelPatternConverter.format(LevelPatternConverter.java:122)
at
org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:36)
at
org.apache.logging.log4j.core.layout.PatternLayout.toSerializable(PatternLayout.java:167)
at
org.apache.logging.log4j.core.layout.PatternLayout.toSerializable(PatternLayout.java:52)
at
org.apache.logging.log4j.core.layout.AbstractStringLayout.toByteArray(AbstractStringLayout.java:45)
at
org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:111)
at
org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender.append(RollingRandomAccessFileAppender.java:96)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:99)
at
org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:425)
at
org.apache.logging.log4j.core.async.AsyncLoggerConfig.asyncCallAppenders(AsyncLoggerConfig.java:116)
at
org.apache.logging.log4j.core.async.AsyncLoggerConfigHelper$Log4jEventWrapperHandler.onEvent(AsyncLoggerConfigHelper.java:218)
at
org.apache.logging.log4j.core.async.AsyncLoggerConfigHelper$Log4jEventWrapperHandler.onEvent(AsyncLoggerConfigHelper.java:203)
at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:133)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:695)
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