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Posted to users@tomcat.apache.org by AJ Chen <aj...@web2express.org> on 2020/05/07 20:40:32 UTC
log4j failed on tomcat9
I use eclipse to develop web app for tomcat, Web app has a dependent
project and so the dependent project and all jars are added on the
classpath for tomcat runtime. Log4j works on tomcat 6. But after upgrate to
tomcat 9, log4j failed to start with the following error. Anyone has seen
similar problem? log4j2 also failed. Thanks.
log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is not
assignable to a "org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas object of
type
log4j:ERROR "org.apache.log4j.DailyRollingFileAppender" was loaded by
[ParallelWebappClassLoader
aj
Re: log4j failed on tomcat9
Posted by AJ Chen <aj...@web2express.org>.
Hi Chris,
my web app META-INF/lib has log4j jar, but CATALINA_BASE/lib does not have
log4j jar listed.
It should be double loading class issue. I need to find out how to exclude
the unwanted classloading.
-aj
On Thu, May 7, 2020 at 2:48 PM Christopher Schultz <
chris@christopherschultz.net> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> AJ,
>
> On 5/7/20 16:40, AJ Chen wrote:
> > I use eclipse to develop web app for tomcat, Web app has a
> > dependent project and so the dependent project and all jars are
> > added on the classpath for tomcat runtime. Log4j works on tomcat 6.
> > But after upgrate to tomcat 9, log4j failed to start with the
> > following error. Anyone has seen similar problem? log4j2 also
> > failed. Thanks.
> >
> > log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is
> > not assignable to a "org.apache.log4j.Appender" variable.
> > log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
> > log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas
> > object of type log4j:ERROR
> > "org.apache.log4j.DailyRollingFileAppender" was loaded by
> > [ParallelWebappClassLoader
>
> Can I just say that the above is a masterpiece of diagnostic error
> messaging?
>
> I can already tell that you have a classloading issue, and it's almost
> certain that you have log4j.jar both in CATALINA_BASE/lib and your web
> application's META-INF/lib directory. Is that the case?
>
> - -chris
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> Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/
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> -----END PGP SIGNATURE-----
>
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> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
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>
>
Re: log4j failed on tomcat9
Posted by AJ Chen <aj...@web2express.org>.
Hi Luis, good blog for logging settings. thanks.
-aj
On Thu, May 7, 2020 at 11:42 PM Luis Rodríguez Fernández <uo...@gmail.com>
wrote:
> Hello AjChen,
>
> Here [1] you can find an example of how I configured log4j2 in tomcat 9.
> You can skip all the bla, bla, bla and go directly to the gitthub repo [2]
> and run the example to have a look at the configuration.
>
> Note: I've been running like this for a while in production, but I do think
> that I am going to come back to the default, beautiful and simple JULI :)
>
> Hope it helps,
>
> Luis
>
> [1]
>
> https://db-blog.web.cern.ch/blog/luis-rodriguez-fernandez/2019-03-keeping-your-logs-clean-apache-tomcat-9-log4j2-and-spring-boot
> [2] https://github.com/lurodrig/log4j2-in-tomcat/
>
> El jue., 7 may. 2020 a las 23:48, Christopher Schultz (<
> chris@christopherschultz.net>) escribió:
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA256
> >
> > AJ,
> >
> > On 5/7/20 16:40, AJ Chen wrote:
> > > I use eclipse to develop web app for tomcat, Web app has a
> > > dependent project and so the dependent project and all jars are
> > > added on the classpath for tomcat runtime. Log4j works on tomcat 6.
> > > But after upgrate to tomcat 9, log4j failed to start with the
> > > following error. Anyone has seen similar problem? log4j2 also
> > > failed. Thanks.
> > >
> > > log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is
> > > not assignable to a "org.apache.log4j.Appender" variable.
> > > log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
> > > log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas
> > > object of type log4j:ERROR
> > > "org.apache.log4j.DailyRollingFileAppender" was loaded by
> > > [ParallelWebappClassLoader
> >
> > Can I just say that the above is a masterpiece of diagnostic error
> > messaging?
> >
> > I can already tell that you have a classloading issue, and it's almost
> > certain that you have log4j.jar both in CATALINA_BASE/lib and your web
> > application's META-INF/lib directory. Is that the case?
> >
> > - -chris
> > -----BEGIN PGP SIGNATURE-----
> > Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/
> >
> > iQIzBAEBCAAdFiEEMmKgYcQvxMe7tcJcHPApP6U8pFgFAl60gjsACgkQHPApP6U8
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> > =IVj+
> > -----END PGP SIGNATURE-----
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
>
> --
>
> "Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better."
>
> - Samuel Beckett
>
Re: log4j failed on tomcat9
Posted by Luis Rodríguez Fernández <uo...@gmail.com>.
Hello AjChen,
Here [1] you can find an example of how I configured log4j2 in tomcat 9.
You can skip all the bla, bla, bla and go directly to the gitthub repo [2]
and run the example to have a look at the configuration.
Note: I've been running like this for a while in production, but I do think
that I am going to come back to the default, beautiful and simple JULI :)
Hope it helps,
Luis
[1]
https://db-blog.web.cern.ch/blog/luis-rodriguez-fernandez/2019-03-keeping-your-logs-clean-apache-tomcat-9-log4j2-and-spring-boot
[2] https://github.com/lurodrig/log4j2-in-tomcat/
El jue., 7 may. 2020 a las 23:48, Christopher Schultz (<
chris@christopherschultz.net>) escribió:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> AJ,
>
> On 5/7/20 16:40, AJ Chen wrote:
> > I use eclipse to develop web app for tomcat, Web app has a
> > dependent project and so the dependent project and all jars are
> > added on the classpath for tomcat runtime. Log4j works on tomcat 6.
> > But after upgrate to tomcat 9, log4j failed to start with the
> > following error. Anyone has seen similar problem? log4j2 also
> > failed. Thanks.
> >
> > log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is
> > not assignable to a "org.apache.log4j.Appender" variable.
> > log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
> > log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas
> > object of type log4j:ERROR
> > "org.apache.log4j.DailyRollingFileAppender" was loaded by
> > [ParallelWebappClassLoader
>
> Can I just say that the above is a masterpiece of diagnostic error
> messaging?
>
> I can already tell that you have a classloading issue, and it's almost
> certain that you have log4j.jar both in CATALINA_BASE/lib and your web
> application's META-INF/lib directory. Is that the case?
>
> - -chris
> -----BEGIN PGP SIGNATURE-----
> Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/
>
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> =IVj+
> -----END PGP SIGNATURE-----
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
--
"Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better."
- Samuel Beckett
Re: log4j failed on tomcat9
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
AJ,
On 5/7/20 16:40, AJ Chen wrote:
> I use eclipse to develop web app for tomcat, Web app has a
> dependent project and so the dependent project and all jars are
> added on the classpath for tomcat runtime. Log4j works on tomcat 6.
> But after upgrate to tomcat 9, log4j failed to start with the
> following error. Anyone has seen similar problem? log4j2 also
> failed. Thanks.
>
> log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is
> not assignable to a "org.apache.log4j.Appender" variable.
> log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
> log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas
> object of type log4j:ERROR
> "org.apache.log4j.DailyRollingFileAppender" was loaded by
> [ParallelWebappClassLoader
Can I just say that the above is a masterpiece of diagnostic error
messaging?
I can already tell that you have a classloading issue, and it's almost
certain that you have log4j.jar both in CATALINA_BASE/lib and your web
application's META-INF/lib directory. Is that the case?
- -chris
-----BEGIN PGP SIGNATURE-----
Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/
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-----END PGP SIGNATURE-----
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Re: log4j failed on tomcat9
Posted by AJ Chen <aj...@web2express.org>.
More test info trying to isolate the problem:
Task:
developing web app project on eclipse 2019 version. main project
includes a dependent project (sub-project) on the same eclipse.
Run main app as java app:
main app vm parameters include: -Dlog4j.configurationFile,
LogManager.getLogger() returns correct logger in main app as well as
sub-project code. meaning, Log4j2 messages can print as expected. no error.
Run web app on tomcat 9, 8 or 7:
For tomcat runtime classpath, eclipse requires to add the sub-project and
all the jars needed (include log4j2 jars), otherwise it complains with no
class found error. However, after log4j2 jars are added, it throws the
above " ERROR StatusLogger Unrecognized format specifier " errors. The web
app can run. Log4j2 messages can print in the main app codes. BUT, Logger
in the sub-project codes does not print messages because it has error.
The cause may be in tomcat or in log4j2, or even eclipse. Any idea?
thanks,
-aj
On Fri, May 8, 2020 at 11:21 AM AJ Chen <aj...@web2express.org> wrote:
> Hi Mark,
> I also use log4j2 in my web app. dev in eclipse, when adding the log4j2
> jars to tomcat 7,8, or 9 runtime, it has this problem, log4j2.xml is
> provided as VM parameter. Web app firsts instantiates log4j2, and then
> tries to config log4j2 again, throwing the following error due to double
> class loading:
>
> ERROR StatusLogger Unrecognized format specifier [d]
> ERROR StatusLogger Unrecognized conversion specifier [d] starting at
> position 16 in conversion pattern.
> ERROR StatusLogger Unrecognized format specifier [thread]
> ERROR StatusLogger Unrecognized conversion specifier [thread] starting at
> position 25 in conversion pattern.
> ERROR StatusLogger Unrecognized format specifier [level]
> ERROR StatusLogger Unrecognized conversion specifier [level] starting at
> position 35 in conversion pattern.
> ERROR StatusLogger Unrecognized format specifier [logger]
> ERROR StatusLogger Unrecognized conversion specifier [logger] starting at
> position 47 in conversion pattern.
> ERROR StatusLogger Unrecognized format specifier [msg]
> ERROR StatusLogger Unrecognized conversion specifier [msg] starting at
> position 54 in conversion pattern.
> ERROR StatusLogger Unrecognized format specifier [n]
> ERROR StatusLogger Unrecognized conversion specifier [n] starting at
> position 56 in conversion pattern.
> ERROR StatusLogger Reconfiguration failed: No configuration found for
> '18b4aac2' at 'null' in 'null'
>
> Please note there is problem in the simple log4j2.xml for testing, which
> can be loaded successfully when there is no double class loading.
>
> -aj
>
>
> On Thu, May 7, 2020 at 1:53 PM Mark Thomas <ma...@apache.org> wrote:
>
>> On 07/05/2020 21:40, AJ Chen wrote:
>> > I use eclipse to develop web app for tomcat, Web app has a dependent
>> > project and so the dependent project and all jars are added on the
>> > classpath for tomcat runtime. Log4j works on tomcat 6. But after
>> upgrate to
>> > tomcat 9, log4j failed to start with the following error. Anyone has
>> seen
>> > similar problem? log4j2 also failed. Thanks.
>>
>> Note: log4j is no longer supported.
>>
>> How, exactly, is log4j configured? What JAR files and what configuration
>> files are where? Any other configuration?
>>
>> Mark
>>
>>
>> >
>> > log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is not
>> > assignable to a "org.apache.log4j.Appender" variable.
>> > log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
>> > log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas object
>> of
>> > type
>> > log4j:ERROR "org.apache.log4j.DailyRollingFileAppender" was loaded by
>> > [ParallelWebappClassLoader
>> >
>> > aj
>> >
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
Re: log4j failed on tomcat9
Posted by AJ Chen <aj...@web2express.org>.
Hi Mark,
I also use log4j2 in my web app. dev in eclipse, when adding the log4j2
jars to tomcat 7,8, or 9 runtime, it has this problem, log4j2.xml is
provided as VM parameter. Web app firsts instantiates log4j2, and then
tries to config log4j2 again, throwing the following error due to double
class loading:
ERROR StatusLogger Unrecognized format specifier [d]
ERROR StatusLogger Unrecognized conversion specifier [d] starting at
position 16 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [thread]
ERROR StatusLogger Unrecognized conversion specifier [thread] starting at
position 25 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [level]
ERROR StatusLogger Unrecognized conversion specifier [level] starting at
position 35 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [logger]
ERROR StatusLogger Unrecognized conversion specifier [logger] starting at
position 47 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [msg]
ERROR StatusLogger Unrecognized conversion specifier [msg] starting at
position 54 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [n]
ERROR StatusLogger Unrecognized conversion specifier [n] starting at
position 56 in conversion pattern.
ERROR StatusLogger Reconfiguration failed: No configuration found for
'18b4aac2' at 'null' in 'null'
Please note there is problem in the simple log4j2.xml for testing, which
can be loaded successfully when there is no double class loading.
-aj
On Thu, May 7, 2020 at 1:53 PM Mark Thomas <ma...@apache.org> wrote:
> On 07/05/2020 21:40, AJ Chen wrote:
> > I use eclipse to develop web app for tomcat, Web app has a dependent
> > project and so the dependent project and all jars are added on the
> > classpath for tomcat runtime. Log4j works on tomcat 6. But after upgrate
> to
> > tomcat 9, log4j failed to start with the following error. Anyone has seen
> > similar problem? log4j2 also failed. Thanks.
>
> Note: log4j is no longer supported.
>
> How, exactly, is log4j configured? What JAR files and what configuration
> files are where? Any other configuration?
>
> Mark
>
>
> >
> > log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is not
> > assignable to a "org.apache.log4j.Appender" variable.
> > log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
> > log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas object
> of
> > type
> > log4j:ERROR "org.apache.log4j.DailyRollingFileAppender" was loaded by
> > [ParallelWebappClassLoader
> >
> > aj
> >
>
>
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> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
Re: log4j failed on tomcat9
Posted by Mark Thomas <ma...@apache.org>.
On 07/05/2020 21:40, AJ Chen wrote:
> I use eclipse to develop web app for tomcat, Web app has a dependent
> project and so the dependent project and all jars are added on the
> classpath for tomcat runtime. Log4j works on tomcat 6. But after upgrate to
> tomcat 9, log4j failed to start with the following error. Anyone has seen
> similar problem? log4j2 also failed. Thanks.
Note: log4j is no longer supported.
How, exactly, is log4j configured? What JAR files and what configuration
files are where? Any other configuration?
Mark
>
> log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is not
> assignable to a "org.apache.log4j.Appender" variable.
> log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
> log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas object of
> type
> log4j:ERROR "org.apache.log4j.DailyRollingFileAppender" was loaded by
> [ParallelWebappClassLoader
>
> aj
>
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