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Andreas,
On 6/9/2009 3:31 PM, Imner, Andreas wrote:
> My companys web application uses log4j 1.2.8 for logging and have
> just recently switched from Weblogic to Tomcat 6.0.18.
>
> Since the we switched to Tomcat, when we do some logging within a
> servlet
>
> " private static final Log log =
> LogFactory.getLog(ExceptionHandlerServlet.class);
> log.error("some message", throwable);
> "
>
> The "some message" -line is written to the file specified by log4j,
> but why does the stacktrace gets written to Tomcats stdout.log?
That depends on what else is going on in your servlet. If you let the
exception propagate (by re-throwing it or throwing a new exception) and
nobody else catches it, then Tomcat's request processing thread code
will catch it and log it to stdout.
> This is our log4j.properties file
>
> "
> log4j.appender.A1=org.apache.log4j.RollingFileAppender
> log4j.appender.A1.MaxBackupIndex=20
> log4j.appender.A1.MaxFileSize=10MB
>
> log4j.appender.A1.layout=org.apache.log4j.PatternLayout
>
> log4j.appender.A1.layout.ConversionPattern=%d{ABSOLUTE} %-5p %X{ak} [%c{1}]
> %m%n
> log4j.rootLogger=ERROR, A1
>
> log4j.category.se=INFO
>
> # All System.out.println is redirected to stdout logger, INFO level
> log4j.category.stdout=INFO
>
> # All System.err.println (includes Exception.printStackTrace() is redirected
> to stderr logger, INFO level
> log4j.category.stderr=INFO
> "
The code you provided does not show any use of the "stdout" category,
but it doesn't really matter because the stdout category does not
actually log to stdout :)
Check to see that your code is not allowing exceptions to propagate.
- -chris
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