8 Replies Latest reply on Sep 1, 2010 9:16 AM by pmuir

Weld logger sl4j

nimo22 Aug 30, 2010 7:17 AM

Weld uses sl4j with cal10n as logging framework. (Does Weld uses log4j?)

Does anyone knows a good tutorial for using this logger in Weld?

In Seam 2, I use this:

@In Logger log;

I cannot find it in Seam 3.

However, in documentation chapter 4.11, it is described a bit:

class LogFactory {
@Produces Logger createLogger(InjectionPoint injectionPoint) {
return Logger.getLogger(injectionPoint.getMember().getDeclaringClass().getName());
}
}

So I can use

@Inject Logger log;

Is it required to place the LogFactory in normal scoped bean (such as ApplicationScope)?

1. Re: Weld logger sl4j

nimo22 Aug 30, 2010 8:42 AM (in response to nimo22)

Okay, found it:

The weld-documentation chapter 19.1. Weld Logger explains that I can use the build-in-logger, which is sl4j-api.jar and sl4j-jdk14. So sl4j-log4j is not uses.

Would it be better to use log4j in my Weld-Application by providing slf4j-log4j12-1.6.1.jar in my classpath..
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2. Re: Weld logger sl4j

nimo22 Aug 30, 2010 9:03 AM (in response to nimo22)

However, following the Documentation:

@SessionScoped @Named
public class MyBean{

@Inject Logger log;

@PostConstruct
public void initialize()
{
log.info("@PostConstruct called");
}

..
}

returns this Deployment-Exception:

org.jboss.weld.exceptions.DeploymentException: WELD-001408 Injection point has unsatisfied dependencies.  Injection point:  field com.MyBean.log;  Qualifiers:  [@javax.enterprise.inject.Default()]

What is missing?

3. Re: Weld logger sl4j

asiandub Aug 31, 2010 1:17 AM (in response to nimo22)
should work ;-)

can you confirm that

- you are using

import org.slf4j.Logger;

- sl4j-api.jar is in your classpath?
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4. Re: Weld logger sl4j

asiandub Aug 31, 2010 2:25 AM (in response to nimo22)

sometimes it's so easy to overlook the obvious - you'll need Weld-Extensions to use the logger.

:-)
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5. Re: Weld logger sl4j

nimo22 Aug 31, 2010 2:58 AM (in response to nimo22)
I can use this:

.. import org.slf4j.Logger; import org.slf4j.LoggerFactory; @SessionScoped @Named public class MyBean { final Logger log = LoggerFactory.getLogger(this.getClass()); .. }

so sl4j-api.jar is in my classpath.

However, weld-extensions is not in my classpath.

The Documentation says:

Note
You can add Weld logging to your project by including weld-logger.jar, sl4j-api.jar and sl4j-jdk14.jar
to your project. Alternatively, express a dependency on the org.jboss.weld:weld-logger
Maven artifact.
If you are using Weld as your JSR-299 implementation, there's no need to include sl4j as it's
already included (and used internally).

I am using Weld as my JSR-299 implementation (included in JBOSS AS M4).

But it does not say anything about weld-extensions!

Where can I get the Weld-Extensions (via Maven)?

http://seamframework.org/Weld/PortableExtensionsPackage says nothing about how to get it!
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6. Re: Weld logger sl4j

nimo22 Aug 31, 2010 3:18 AM (in response to nimo22)

Okay, found it.

This

<dependency>
          <groupId>org.jboss.weld</groupId>
          <artifactId>weld-extensions</artifactId>
          <version>1.0.0.Alpha2</version>
          <scope>import</scope>
</dependency>

includes the weld-extensions into my project.

Thanks Jan.

7. Re: Weld logger sl4j

nimo22 Aug 31, 2010 3:38 AM (in response to nimo22)

Would be nice to include this in the Weld-Documentation (at least in chapter 19).
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8. Re: Weld logger sl4j

pmuir Sep 1, 2010 9:16 AM (in response to nimo22)

We are in the process of rebuilding the docs for weldx :-)
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