logging-log4j-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Matt Sicker <boa...@gmail.com>
Subject Re: Debugging JDBC
Date Sun, 20 Jul 2014 19:00:41 GMT
Well, if you don't override the methods in PrintWriter, then the call stack
won't include the LogWriter class in the stack trace since it used a
super-class method. Then it becomes non-trivial to find the caller class in
the stack.


On 20 July 2014 00:54, Gary Gregory <garydgregory@gmail.com> wrote:

> On Sun, Jul 20, 2014 at 1:14 AM, Matt Sicker <boards@gmail.com> wrote:
>
>> That is correct in regards to the toPrintWriter(). There's a bit of
>> generated delegate code to create a usable call stack to get a readable
>> calling class from.
>>
>
> Can you explain? Why do we need this? In my case, all I am doing to
> redirecting logging.
>
> Gary
>
>
>>
>> On 19 July 2014 23:21, Gary Gregory <garydgregory@gmail.com> wrote:
>>
>>> On Sun, Jul 20, 2014 at 12:18 AM, Gary Gregory <garydgregory@gmail.com>
>>> wrote:
>>>
>>>> So I would expect to be able to do this:
>>>>
>>>>
>>>> java.sql.DriverManager.setLogWriter(LogManger.getLogger("com.foo").toPrintWriter());
>>>>
>>>> or, if Logger implments PrintWriter (a bit heavy IMO):
>>>>
>>>> java.sql.DriverManager.setLogWriter(LogManger.getLogger("com.foo"));
>>>>
>>>
>>> Forget this last point since PrintWriter is a class, not an interface.
>>>
>>>  Adding toPrintWriter() to the public API seems OK, but it might need to
>>> be backed up by a bunch of code I suppose.
>>>
>>> Gary
>>>
>>>
>>>> ?
>>>>
>>>> Gary
>>>>
>>>>
>>>> On Sat, Jul 19, 2014 at 5:53 PM, Matt Sicker <boards@gmail.com> wrote:
>>>>
>>>>> Basically, you can get a PrintStream and a PrintWriter instance that
>>>>> uses a Logger to write to instead of an actual OutputStream or Writer.
It's
>>>>> an additional jar, so it can be added on top of Log4j 2.
>>>>>
>>>>>
>>>>> On 19 July 2014 16:44, Gary Gregory <garydgregory@gmail.com> wrote:
>>>>>
>>>>>> Ah, right!
>>>>>>
>>>>>> Can't dig in now, but can that be added on top of Log4j 2 or does
it
>>>>>> have to be integrated _in_ log4j 2?
>>>>>>
>>>>>> Gary
>>>>>>
>>>>>>
>>>>>> On Sat, Jul 19, 2014 at 5:12 PM, Matt Sicker <boards@gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> See branches/experimental/log4j-streams
>>>>>>>
>>>>>>> It's what Bruce and I worked on back when we were both newbies
to
>>>>>>> development here.
>>>>>>>
>>>>>>>
>>>>>>> On 19 July 2014 16:01, Gary Gregory <garydgregory@gmail.com>
wrote:
>>>>>>>
>>>>>>>> JDBC has this API:
>>>>>>>>
>>>>>>>> java.sql.DriverManager.setLogWriter(PrintWriter)
>>>>>>>>
>>>>>>>> How can we use that to log to Log4j 2?
>>>>>>>>
>>>>>>>> Gary
>>>>>>>>
>>>>>>>> --
>>>>>>>> E-Mail: garydgregory@gmail.com | ggregory@apache.org
>>>>>>>> Java Persistence with Hibernate, Second Edition
>>>>>>>> <http://www.manning.com/bauer3/>
>>>>>>>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
>>>>>>>> Spring Batch in Action <http://www.manning.com/templier/>
>>>>>>>> Blog: http://garygregory.wordpress.com
>>>>>>>> Home: http://garygregory.com/
>>>>>>>> Tweet! http://twitter.com/GaryGregory
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Matt Sicker <boards@gmail.com>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> E-Mail: garydgregory@gmail.com | ggregory@apache.org
>>>>>> Java Persistence with Hibernate, Second Edition
>>>>>> <http://www.manning.com/bauer3/>
>>>>>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
>>>>>> Spring Batch in Action <http://www.manning.com/templier/>
>>>>>> Blog: http://garygregory.wordpress.com
>>>>>> Home: http://garygregory.com/
>>>>>> Tweet! http://twitter.com/GaryGregory
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Matt Sicker <boards@gmail.com>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> E-Mail: garydgregory@gmail.com | ggregory@apache.org
>>>> Java Persistence with Hibernate, Second Edition
>>>> <http://www.manning.com/bauer3/>
>>>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
>>>> Spring Batch in Action <http://www.manning.com/templier/>
>>>> Blog: http://garygregory.wordpress.com
>>>> Home: http://garygregory.com/
>>>> Tweet! http://twitter.com/GaryGregory
>>>>
>>>
>>>
>>>
>>> --
>>> E-Mail: garydgregory@gmail.com | ggregory@apache.org
>>> Java Persistence with Hibernate, Second Edition
>>> <http://www.manning.com/bauer3/>
>>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
>>> Spring Batch in Action <http://www.manning.com/templier/>
>>> Blog: http://garygregory.wordpress.com
>>> Home: http://garygregory.com/
>>> Tweet! http://twitter.com/GaryGregory
>>>
>>
>>
>>
>> --
>> Matt Sicker <boards@gmail.com>
>>
>
>
>
> --
> E-Mail: garydgregory@gmail.com | ggregory@apache.org
> Java Persistence with Hibernate, Second Edition
> <http://www.manning.com/bauer3/>
> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
> Spring Batch in Action <http://www.manning.com/templier/>
> Blog: http://garygregory.wordpress.com
> Home: http://garygregory.com/
> Tweet! http://twitter.com/GaryGregory
>



-- 
Matt Sicker <boards@gmail.com>

Mime
View raw message