[JBoss JIRA] Created: (JBAS-8541) Deploying an application that has its own slf4j jars causes errors in the server log
7:44 p.m.
Deploying an application that has its own slf4j jars causes errors in the server log
------------------------------------------------------------------------------------
Key: JBAS-8541
URL: https://jira.jboss.org/browse/JBAS-8541
Project: JBoss Application Server
Issue Type: Bug
Security Level: Public (Everyone can see)
Components: Logging
Affects Versions: JBossAS-5.1.0.GA
Reporter: Nikita D
Assignee: David Lloyd
Priority: Minor
If an application depends on a different version of slf4j than the one packaged with
JBoss, the slf4j jars (api and impl) need to be included with the application. This
results in the "multiple SLF4J bindings" error message:
00:34:25,247 ERROR [STDERR] SLF4J: Class path contains multiple SLF4J bindings.
00:34:25,247 ERROR [STDERR] SLF4J: Found binding in
[vfszip:/C:/a/bin/jboss/jboss-5.1.0.GA/common/lib/slf4j-jboss-logging.jar/org/slf4j/impl/StaticLoggerBinder.class]
00:34:25,247 ERROR [STDERR] SLF4J: Found binding in
[vfszip:/c:/a/ear/suite.ear/lib/slf4j-log4j12-1.5.8.jar/org/slf4j/impl/StaticLoggerBinder.class]
00:34:25,247 ERROR [STDERR] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings
for an explanation.
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8:26 p.m.
New subject: [JBoss JIRA] Resolved: (JBAS-8541) Deploying an application that has its own slf4j jars causes errors in the server log
[
https://jira.jboss.org/browse/JBAS-8541?page=com.atlassian.jira.plugin.sy...
]
David Lloyd resolved JBAS-8541.
-------------------------------
Resolution: Rejected
I do not believe this is a bug. See my posts on the referenced forum thread.
Deploying an application that has its own slf4j jars causes errors in
the server log
------------------------------------------------------------------------------------
Key: JBAS-8541
URL: https://jira.jboss.org/browse/JBAS-8541
Project: JBoss Application Server
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: Logging
Affects Versions: JBossAS-5.1.0.GA
Reporter: Nikita D
Assignee: David Lloyd
Priority: Minor
If an application depends on a different version of slf4j than the one packaged with
JBoss, the slf4j jars (api and impl) need to be included with the application. This
results in the "multiple SLF4J bindings" error message:
00:34:25,247 ERROR [STDERR] SLF4J: Class path contains multiple SLF4J bindings.
00:34:25,247 ERROR [STDERR] SLF4J: Found binding in
[vfszip:/C:/a/bin/jboss/jboss-5.1.0.GA/common/lib/slf4j-jboss-logging.jar/org/slf4j/impl/StaticLoggerBinder.class]
00:34:25,247 ERROR [STDERR] SLF4J: Found binding in
[vfszip:/c:/a/ear/suite.ear/lib/slf4j-log4j12-1.5.8.jar/org/slf4j/impl/StaticLoggerBinder.class]
00:34:25,247 ERROR [STDERR] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings
for an explanation.
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10:58 p.m.
New subject: [JBoss JIRA] Reopened: (JBAS-8541) Deploying an application that has its own slf4j jars causes errors in the server log
[
https://jira.jboss.org/browse/JBAS-8541?page=com.atlassian.jira.plugin.sy...
]
Nikita D reopened JBAS-8541:
----------------------------
Could you please reconsider this ticket? This issue has already come up multiple times
(see linked tickets) and it will keep coming up since more and more popular projects are
adopting slf4j. For example, right now any application that uses Hibernate will trigger
these errors when deployed on JBoss.
Here's a recap of all the suggested solutions so far:
1. Remove the slf4j jars from the application. This is not an option if the slf4j version
needed by the application is different than the one packaged with JBoss.
2. Remove the JBoss slf4j jars. This is not an option if several applications are
deployed to JBoss and one of them wants to use the JBoss slf4j jars. Also, it's not
viable to tell a customer that they need to modify the app server's common jars just
to deploy one additional application to an existing server running their apps.
3. Change the classloading config for the app to exclude the JBoss slf4j jars. This is
the real solution, but unfortunately it seems that this is not possible to configure
out-of-the-box (see http://community.jboss.org/thread/156441).
Given the above, I think it's fair to say that there are 3 potential workarounds for
this problem, but not an actual solution/fix.
For reference, these are the classloading wiki docs:
* http://community.jboss.org/wiki/classloadingconfiguration
* http://community.jboss.org/wiki/ClassLoadingOverview
* http://community.jboss.org/wiki/JBossClassLoadingUseCases
* http://community.jboss.org/wiki/JBoss5custommetadatafiles
Deploying an application that has its own slf4j jars causes errors in
the server log
------------------------------------------------------------------------------------
Key: JBAS-8541
URL: https://jira.jboss.org/browse/JBAS-8541
Project: JBoss Application Server
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: Logging
Affects Versions: JBossAS-5.1.0.GA
Reporter: Nikita D
Assignee: David Lloyd
Priority: Minor
If an application depends on a different version of slf4j than the one packaged with
JBoss, the slf4j jars (api and impl) need to be included with the application. This
results in the "multiple SLF4J bindings" error message:
00:34:25,247 ERROR [STDERR] SLF4J: Class path contains multiple SLF4J bindings.
00:34:25,247 ERROR [STDERR] SLF4J: Found binding in
[vfszip:/C:/a/bin/jboss/jboss-5.1.0.GA/common/lib/slf4j-jboss-logging.jar/org/slf4j/impl/StaticLoggerBinder.class]
00:34:25,247 ERROR [STDERR] SLF4J: Found binding in
[vfszip:/c:/a/ear/suite.ear/lib/slf4j-log4j12-1.5.8.jar/org/slf4j/impl/StaticLoggerBinder.class]
00:34:25,247 ERROR [STDERR] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings
for an explanation.
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7:59 a.m.
New subject: [JBoss JIRA] Resolved: (JBAS-8541) Deploying an application that has its own slf4j jars causes errors in the server log
[
https://jira.jboss.org/browse/JBAS-8541?page=com.atlassian.jira.plugin.sy...
]
David Lloyd resolved JBAS-8541.
-------------------------------
Fix Version/s: 7.0.0.M1
Resolution: Done
You missed the simple solution of upgrading slf4j in the AS. Otherwise, these are the
only solutions that are going to happen for 5.x/6.x. There is no other magical fix
possible.
For AS 7.x, the class loading model will be modular, not flat, meaning that you can easily
selectively include or exclude provided modules like slf4j.
If it makes you feel better, I'm marking this issue as "fixed for 7.0.0.M1".
Otherwise you must use one of the existing solutions. If custom class loading isn't
working then you should open a separate issue for that because that would be a bug that
can and should be fixed within the 5.x/6.x series.
Deploying an application that has its own slf4j jars causes errors in
the server log
------------------------------------------------------------------------------------
Key: JBAS-8541
URL: https://jira.jboss.org/browse/JBAS-8541
Project: JBoss Application Server
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: Logging
Affects Versions: JBossAS-5.1.0.GA
Reporter: Nikita D
Assignee: David Lloyd
Priority: Minor
Fix For: 7.0.0.M1
If an application depends on a different version of slf4j than the one packaged with
JBoss, the slf4j jars (api and impl) need to be included with the application. This
results in the "multiple SLF4J bindings" error message:
00:34:25,247 ERROR [STDERR] SLF4J: Class path contains multiple SLF4J bindings.
00:34:25,247 ERROR [STDERR] SLF4J: Found binding in
[vfszip:/C:/a/bin/jboss/jboss-5.1.0.GA/common/lib/slf4j-jboss-logging.jar/org/slf4j/impl/StaticLoggerBinder.class]
00:34:25,247 ERROR [STDERR] SLF4J: Found binding in
[vfszip:/c:/a/ear/suite.ear/lib/slf4j-log4j12-1.5.8.jar/org/slf4j/impl/StaticLoggerBinder.class]
00:34:25,247 ERROR [STDERR] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings
for an explanation.
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5752
days inactive
5757
days old
3 comments
2 participants
participants (2)
-
David Lloyd (JIRA) -
Nikita D (JIRA)