Re: Concurrent, persistent background process for a J2EE container

Donkey Hottie <>
29 Aug 2008 19:49:46 GMT
Arne Vajh?j <> wrote in

Donkey Hottie wrote:

Arne Vajh?j <> wrote in

Donkey Hottie wrote:

We can't use java.util.logging for this. Boss wants "structured"
data, not flat text files.

Even java.util.logging support custom formatters and handlers.

(Log4j is better though)

Our admin/access audit logs will be written to (implementation may
vary) to a database or disk file in some structured format, and
those logs will be available in the Management Console GUI.

java.util.logging and Log4j can be customized for a task like that.

Can java.util.logging take a parameter like a own rolled Java Object,
not a String as a thing to log? or a String of xml formatted

Ok, maybe it can. XML string is a string. Have to think about this..
maybe no need for a custom formatter, put the xml in, and read it
out. As long as it's on one LINE in the log it might work.

See the code below for an example of what a custom formatter can do.

If you need it written in a custom way we will also need a custom


PS: The code below is demo code - you may want to make it a bit more
     robust for production.


import java.util.logging.Formatter;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

public class CustomFormatter extends Formatter {
     public String format(LogRecord record) {
         return "####" + record.getMessage() + "####" +
     public static void setup() {
         Logger log = Logger.getLogger("foobar");
         while(log.getParent() != null) log = log.getParent();
         log.getHandlers()[0].setFormatter(new CustomFormatter());
     public static void main(String[] args) {
         Logger logger1 = Logger.getLogger("test");"This is a test");
         Logger logger2 = Logger.getLogger("test.test");"This is also a test");

It outputs

####This is a test####
####This is also a test####

The base of if is the record.getMessage()

I need a structured message, not a String.

Ok, I could extend LogRecord, and get its getters for info. But how about

I want a log record like this

   <action result="success">MODIFY</action>
   <entity type="Customer">
           <attribute name="address">
              <oldvalue>Ankkalinna 11</oldvalue>
              <newvalue>Hanhilinna 12</newvalue>

How In earth do I that with

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(Zohar 11, 4b).