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https://issues.apache.org/jira/browse/MTOMCAT-257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13876600#comment-13876600
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Brendan Le Ny commented on MTOMCAT-257:
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<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.
> Classpathes separation between plugin and application is broken (can't use
> slf4j-jcl in app)
> --------------------------------------------------------------------------------------------
>
> Key: MTOMCAT-257
> URL: https://issues.apache.org/jira/browse/MTOMCAT-257
> Project: Apache Tomcat Maven Plugin
> Issue Type: Bug
> Components: tomcat7
> Affects Versions: 2.1
> Reporter: Brendan Le Ny
> Assignee: Olivier Lamy (*$^¨%`£)
> Attachments: MTOMCAT-227-2.zip, 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.
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