You could use a custom MessageFactory.
public class MyMessageFactory extends ParameterizedMessageFactory {
private final String objId;
public MyMessageFactory(Object obj) {
this.objId = obj.toString();
}
@Override
public Message newMessage(final String message, final Object... params)
{
return new ParameterizedMessage("{}: " + message, objId,
params);
}
}
then just do
public class MyClass {
private String id = "512";
private Logger logger =
LogManager.getLogger("com.mycorp.mycomponent.MyClass", new
MyMessageFactory(this));
public doWork() {
logger.error("this is an error");
}
public String toString() {
return this.id;
}
}
When the error is logged you should see "512: this is an error" as the message.
Ralph
On May 27, 2013, at 8:15 AM, Lucie Boubée wrote:
> 2013/5/27 Remko Popma <rem...@yahoo.com>
>
>>
>> On 2013/05/27, at 23:50, Lucie Boubée <lbou...@gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I use log4j2 beta 6 and I would like to add a prefix to all my messages.
>>> This prefix is passed to the constructor parameter and it depends on the
>>> instance of the class. So we're at the object level (not class or
>> thread).
>>>
>>> For example, I have an A class instantiated like new A(152), so when I
>> use
>>> log.error("message") on this class, 152: is written just before the
>>> message. For new A(155),155: will be displayed instead.
>>
>> Do you mean that the call to log.error("message") is inside class A?
>> In that case, how about simply using
>> log.error("{} message", myPrefix);
>> Would that work?
>>
>
> Yes, log.error("message") is calling inside class A.
> log.error('{} message", myPrefix) work, but I would like to avoid to add
> the prefix every time I read a log error, like with ThreadContext.
>
>>
>>>
>>> I try to use ThreadContext.put on the constructor but, I don't know when
>>> logger wiil be call consequently the prefix is set to the last
>>> ThreadContext called but that does not necessarily correspond to the
>>> correct class instance
>>> I ask to stackoverflow (
>>>
>> http://stackoverflow.com/questions/16723016/how-do-i-add-a-prefix-to-log4j-messages-at-the-object-level
>> )
>>> but
>>> it has not solved my problem.
>>>
>>> --
>>> Lucie
>>
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>>
>
>
> --
> Lucie BOUBÉE
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