Hi all,
I am brand new to this wonderful slf4j tool(started to read about it 2
hours ago) and from my understanding switching to it should be a pain
free process. However I ran into some problems.
My project mainly uses log4j directly and it now depends on a 3rd party
library which uses JUL as its logging framework. I would like to make
sure all the logs the 3rd party lib produces under the control of my
log4j settings. After a quick search on Google, the best approach seems
to be use the slf4j lib to bridge JUL to it and then tell slf4j to use
log4j as its backing implementation.
So my solution idea is:
1.Delegating all of my log4j logging request to slf4j (by using log4j
over slf4j and removing the log4j jar)
2. Make sure JUL log requests go to slf4j by using jul-to-slf4j.
3. Make sure slf4j uses log4j's implementation by using lf4j-log4j12. So
hopefully I get:
A: my log4j.xml settings still work.
B: the 3rd party lib's JUL logging requests end up going to log4j in
the end.
My steps are:
1. comment out the dependency on log4j in my pom.xml, so the log4j.jar
will no longer be in my webapp/lib
2. introduce the following 3 dependencies.
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
<version>1.5.8</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.5.8</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jul-to-slf4j</artifactId>
<version>1.5.8</version>
</dependency>
After applying the changes, the project still builds, great. But it
fails immediately on runtime:
Spring complains that it could not initialize org.apache.log4j.logger.
Detailed message:
Nested in org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'paypalRestService' defined in file
[/home/jasonw/dev/bulletin-paymentengine/target/classes/com/bulletin/paymentengine/api/paypal/rest/resource/PaypalRestService.class]:
Instantiation of bean failed; nested exception is
java.lang.NoClassDefFoundError: Could not initialize class
org.apache.log4j.Logger:
java.lang.NoClassDefFoundError: Could not initialize class
org.apache.log4j.Logger
at
com.bulletin.paymentengine.api.paypal.rest.resource.PaypalRestService.<clinit>(PaypalRestService.java:45)
So, my questions are: will my solution work at all in theory? Is there
anything wrong in my solution?
How to fix this spring problem?
Thanks alot.
Jas
_______________________________________________
user mailing list
user@slf4j.org
http://www.slf4j.org/mailman/listinfo/user
