[hibernate-dev] [infinispan-dev] Possible error of dependency on infinispan-query pom

Galder Zamarreño galder at jboss.org
Wed Jul 14 09:45:03 EDT 2010


I've created https://jira.jboss.org/browse/ISPN-541 to revisit current query module dependencies when Hibernate Search upgrades to SLF4J 1.6.

If you create a jira for that, let me know so that I can keep track of it and find out when an updated HBS is released.


On Jul 14, 2010, at 2:23 PM, Ceki Gülcü wrote:

> On 14/07/2010 1:41 PM, Steve Ebersole wrote:
>> Ah we are using 1.5.8 currently.  We should upgrade to 1.6 then.
> Yes, you should upgrade to 1.6.0.
> You should also be aware that slf4j-api 1.6. will *not* work with
> bindings from the 1.5 series. So, if the next version of hibernate,
> say 3.5.4 uses SLF4J version 1.6, when an end-user upgrades to
> Hibernate 3.5.4, she will also need to update her SLF4J binding to
> version 1.6 as well. For example, if the user has
> slf4j-log4j-1.5.8.jar on the class path and upgrades to Hibernate
> 3.5.4, she will need to replace slf4j-log4j12-1.5.8.jar with
> slf4j-log4j12-1.6.jar.
> Now, if the user forgets to update the binding for log4j, then when
> SLF4J initializes, the version mismatch issue will be *automatically*
> detected and SLF4J will duly warn the user by emitting a message on
> the console.
> I would expect even a half-alert developer to successfully deal with
> this issue within 10 minutes after upgrading. However, I have to admit
> that some minimal amount of alertness of the part of the developer is
> required. The upgrade process to SLF4J 1.6 is unfortunately not
> totally transparent.
> Note that the api and bindings in the 1.6 series are planned to be all
> mutually compatible. The version mismatch issue only occurs when
> upgrading SFL4J from the 1.5.x series to the 1.6.x series.
> HTH,
>> On Wed, 2010-07-14 at 13:24 +0200, Ceki Gülcü wrote:
>>> Galder Zamarreño wrote:
>>>> Hmmm, these looks like a problem in Hibernate Search since they're the
>>>> ones using slf4j.
>>>> I don't see why Infinispan Query should explicitly declare a
>>>> dependency on slf4j.
>>> Hello Galder,
>>> The issue reported by Israel Lacerra, that is the NoClassDefFoundError
>>> for org.slf4j.impl.StaticLoggerBinder, no longer occurs in SLF4J 1.6
>>> and later. Upgrading to SLF4J v1.6 will cause the problem to
>>> disappear.
>>> Quoting the SLF4J manual [1]:
>>>   Libraries
>>>   Authors of widely-distributed components and libraries may code
>>>   against the SLF4J interface in order to avoid imposing an logging
>>>   framework on the end-user of the component or library. He or she may
>>>   choose the desired logging framework at deployment time by inserting
>>>   the desired slf4j binding on the classpath, which may be changed later
>>>   by replacing an existing binding with another on the class path and
>>>   restarting the application. This approach has proven to be simple and
>>>   very robust.
>>>   As of SLF4J version 1.6.0, if no binding is found on the class path,
>>>   then slf4j-api will default to a no-operation implementation
>>>   discarding all log requests. Thus, instead of throwing an exception,
>>>   SLF4J will emit a single warning message about the absence of a
>>>   binding and proceed to discard all log requests without further
>>>   protest. For example, let Wombat be some biology-related framework
>>>   depending on SLF4J for logging. In order to avoid imposing a logging
>>>   framework on the end-user, Wombat's distribution includes
>>>   slf4j-api.jar but no binding. Even in the absence of any SLF4J binding
>>>   on the class path, Wombat's distribution will still work
>>>   out-of-the-box, and without requiring the end-user to download a
>>>   binding from SLF4J's web-site. Only when the end-user wishes to enable
>>>   logging will she need to install a binding.
>>> I hope this sheds lights onto the  matter,
>>> --
>>> Ceki
>>> [1] http://slf4j.org/manual.html#libraries
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Galder Zamarreño
Sr. Software Engineer
Infinispan, JBoss Cache

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