John Scott Brown created LOG4J2-2549:
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Summary: SMTP fails send messages that originate from main program.
Key: LOG4J2-2549
URL: https://issues.apache.org/jira/browse/LOG4J2-2549
Project: Log4j 2
Issue Type: Bug
Components: Appenders
Affects Versions: 2.11.0
Environment: Linux server-2 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6
14:45:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Reporter: John Scott Brown
Fix For: 2.11.0
Attachments: Foo.java, GmailAppender.java, GmailManager.java,
LoggerTest.java
In the course of trying to setup Gmail as the SMTP sender I turned to writing a
custom appender basically hacking the SMTP code to add needed features to
support TLS using port 587. I wrote a simple test program that logged a single
message from the main program, and, that was it. In the course of debugging my
modified SMTP appender I found that the append method which called sendEvents
to the manager never got called. So, in the configuration I turned on
status="debug", to get more info and the smtpDebug flag set true, as well as
using the debugger on my customized appender. I also ran the SMTP appender
alongside as comparison. Both appender use the same flow control logic but my
custom appender modified the properties values to build the javamail session.
With the status debug flags turned on I could also see in both appenders, the
sendEvents processing was not being called, which I attribute to the append
method not being called at the finish of application operation. I tried various
things, finally, based on some old hints that other users reported, tried
adding another class and calling a method from the new class in the main
program that issued a logger.fatal call. That resulted in indication that the
sendEvents logic was now being evoked in the SMTP appender. Now, the send
failed because of the lack of TLS support which I have reported in a previous
issue, but, this is another problem, that probably is fairly rare since most
apps will report errors in some other class than from the main method.
Of course, there is a work around since the main method logic can be
encapsulated in another class and simply evoked in the main method. I am
attaching the custom appender code that I wrote and the testbed code so that
you see that it uses the same SMTP flow control as does SMTPappender.
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