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

Emmanuel Bernard emmanuel at hibernate.org
Wed Jul 14 09:56:40 EDT 2010


On 14 juil. 2010, at 14:45, Galder Zamarreño wrote:

> Emmanuel,
> 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.
> Cheers,
> 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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