tomcat-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Brendan Le Ny (JIRA)" <>
Subject [jira] [Commented] (MTOMCAT-227) Can't use slf4j-jcl with tomcat7:run
Date Fri, 17 Jan 2014 15:33:33 GMT


Brendan Le Ny commented on MTOMCAT-227:

Hi Neale (Tony coworker speaking), 

<useSeparateTomcatClassLoader>true</useSeparateTomcatClassLoader> doesn't solve
the issue.

It seems that the classpaths are not separated.

I've created a project to show the whole issue. The problem appeared when i added shiro as
a dependency to my project. Shiro depends on slf4j-api. I also use commons-codec 1.8. My project
use log4j to log and slf4j-jcl to gather slf4j logs (so i will get Shiro's log). Log4j and
slf4j-jcl are in scope runtime.

Here is the whole thing:
* if I do a tomcat:run, the application breaks, because tomcat-plugin put jcl-over-slf4j in
classpath and slf4j initialization fail because you can't have both jcl-over-slf4j and slf4j-jcl
in the same classpath. The application works when deployed in a tomcat, but it doesn't work
in tomcat:run. That's the exact problem Tony raised.
* If I add <useSeparateTomcatClassLoader>true</useSeparateTomcatClassLoader> in
plugin config, it solve the issue because jcl-over-slf4j and slf4j-jcl
* But ! it raise another issue: in my application, I use commons-codec 1.8 and when the time
come when the class is loaded, I get a linkage error saying that DigestUtils#sha1hex method
doesn't exists. It exists in commons-codec 1.8 but not in commons-codec version declared in
tomcat-plugin. So it seems that even with useSeparateTomcatClassLoader=true, the actual classpath
of the application running in tomcat7:run is not the same that the one given by mvn package,
ie with the exact dependencies and exact version defined in the project's pom.

For now, the only workaround i've found is to leave useSeparateTomcatClassLoader = false and
add a maven profile to put  slf4j-jcl in scope runtime, I use the profile only when doing
a tomcat7:run. I don't know if useSeparateTomcatClassLoader = true is buggy or what occurs
actually but it's sure that the application's classpath is not sane.

> Can't use slf4j-jcl with tomcat7:run
> ------------------------------------
>                 Key: MTOMCAT-227
>                 URL:
>             Project: Apache Tomcat Maven Plugin
>          Issue Type: Bug
>          Components: tomcat7
>    Affects Versions: 2.1
>            Reporter: Tony Chemit
>            Assignee: Olivier Lamy (*$^¨%`£)
>         Attachments: MTOMCAT-227.tgz
> I use in my war the slf4j-jcl, which is not compatible with the jcl-over-slf4j used in
the plugin dependencies.
> I give you a little project that show the problem.

This message was sent by Atlassian JIRA

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message