Sam Beroz created LOG4J2-894:
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Summary: AsyncAppender throws ConfigurationException when wrapped
SyslogAppender fails
Key: LOG4J2-894
URL: https://issues.apache.org/jira/browse/LOG4J2-894
Project: Log4j 2
Issue Type: Bug
Affects Versions: 2.1
Environment: All
Reporter: Sam Beroz
Priority: Minor
I'd like a way to create AsyncAppender and have it not throw if the appender it
wraps is unavailable. My work around is to always also include an appender that
I know to be available.
I've got a SyslogAppender that sends logs to a remote EC2 box and I've wrapped
it in an AsyncAppender. The log traffic's is just to monitor the state of the
application and it's ok if it's not sent should the machine running it loose
its internet connection or if Amazon goes down.
When I set the SyslogAppender's host to a fake URL I had expected it to fail
gracefully but instead when I call LogManager.getLogger() the AsyncAppender
threw a ConfigurationException reportingthat "No appenders are available for
AsyncAppender", killing my whole application.
From: org/apache/logging/log4j/core/appender/AsyncAppender.java
104 } else if (errorRef == null) {
105 throw new ConfigurationException("No appenders are available
for AsyncAppender " + getName());
106 }
Looking at the source I thought I could avoid this by adding my
ConsoleAppender as an errorRef but that results in a NullPointerException on
startup because I still have zero appenders so start is called on the
uninitialized thread:
101 if (appenders.size() > 0) {
102 thread = new AsyncThread(appenders, queue);
103 thread.setName("AsyncAppender-" + getName());
104 } else if (errorRef == null) {
105 throw new ConfigurationException("No appenders are available
for AsyncAppender " + getName());
106 }
107
108 thread.start();
I was able to work around this by also including my ConsoleAppender in the
AsyncAppender so it always contains at least one valid appender:
<!-- The AsyncAppender will throw a Configuration Exception if it can't
send data anywhere -->
<Async name="Async" blocking="false" includeLocation="true">
<AppenderRef ref="SYSLOG"/>
<AppenderRef ref="CONSOLE"/>
</Async>
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