5.5. Logging Sample Configurations

Procedure 5.1. Configure the Root Logger

1. Set the level Property

   The level property sets the maximum level of log message that the root logger records.

   <subsystem xmlns="urn:jboss:domain:logging:1.4">
      <root-logger>
         <level name="INFO"/>

2. List handlers

   handlers is a list of log handlers that are used by the root logger.

   <subsystem xmlns="urn:jboss:domain:logging:1.4">
        <root-logger>
           <level name="INFO"/>
           <handlers>
              <handler name="CONSOLE"/>
              <handler name="FILE"/>
           </handlers>
        </root-logger>
     </subsystem>

Procedure 5.2. Configure a Log Category

<subsystem xmlns="urn:jboss:domain:logging:1.4">
   <logger category="com.company.accounts.rec" use-parent-handlers="true">
      <level name="WARN"/>
      <handlers>
         <handler name="accounts-rec"/>
      </handlers>
   </logger>
</subsystem>

1. Use the category property to specify the log category from which log messages will be captured.
   The use-parent-handlers is set to "true" by default. When set to "true", this category will use the log handlers of the root logger in addition to any other assigned handlers.
2. Use the level property to set the maximum level of log message that the log category records.
3. The handlers element contains a list of log handlers.

Procedure 5.3. Configure the Console Log Handler

<subsystem xmlns="urn:jboss:domain:logging:1.4">
   <console-handler name="CONSOLE" autoflush="true">
      <level name="INFO"/>
      <encoding value="UTF-8"/>
      <target value="System.out"/>
      <filter-spec value="not(match(&quot;JBAS.*&quot;))"/>
      <formatter>
         <pattern-formatter pattern="%K{level}%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"/>
      </formatter>
   </console-handler>
</subsystem>

1. Add the Log Handler Identifier Information

   The name property sets the unique identifier for this log handler.
   When autoflush is set to "true" the log messages will be sent to the handler's target immediately upon request.

2. Set the level Property

   The level property sets the maximum level of log messages recorded.

3. Set the encoding Output

   Use encoding to set the character encoding scheme to be used for the output.

4. Define the target Value

   The target property defines the system output stream where the output of the log handler goes. This can be System.err for the system error stream, or System.out for the standard out stream.

5. Define the filter-spec Property

   The filter-spec property is an expression value that defines a filter. The example provided defines a filter that does not match a pattern: not(match("JBAS.*")).

6. Specify the formatter

   Use formatter to list the log formatter used by the log handler.

Procedure 5.4. Configure the File Log Handler

<file-handler name="accounts-rec-trail" autoflush="true">
    <level name="INFO"/>
    <encoding value="UTF-8"/>
    <file relative-to="jboss.server.log.dir" path="accounts-rec-trail.log"/>
    <formatter>
        <pattern-formatter pattern="%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"/>
    </formatter>
    <append value="true"/>
</file-handler>

1. Add the File Log Handler Identifier Information

   The name property sets the unique identifier for this log handler.
   When autoflush is set to "true" the log messages will be sent to the handler's target immediately upon request.

2. Set the level Property

   The level property sets the maximum level of log message that the root logger records.

3. Set the encoding Output

   Use encoding to set the character encoding scheme to be used for the output.

4. Set the file Object

   The file object represents the file where the output of this log handler is written to. It has two configuration properties: relative-to and path.
   The relative-to property is the directory where the log file is written to. JBoss Enterprise Application Platform 6 file path variables can be specified here. The jboss.server.log.dir variable points to the log/ directory of the server.
   The path property is the name of the file where the log messages will be written. It is a relative path name that is appended to the value of the relative-to property to determine the complete path.

5. Specify the formatter

   Use formatter to list the log formatter used by the log handler.

6. Set the append Property

   When the append property is set to "true", all messages written by this handler will be appended to an existing file. If set to "false" a new file will be created each time the application server launches. Changes to append require a server reboot to take effect.

Procedure 5.5. Configure the Periodic Log Handler

<periodic-rotating-file-handler name="FILE" autoflush="true">
   <level name="INFO"/>
   <encoding value="UTF-8"/>
   <formatter>
      <pattern-formatter pattern="%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"/>
   </formatter>
   <file relative-to="jboss.server.log.dir" path="server.log"/>
   <suffix value=".yyyy-MM-dd"/>
   <append value="true"/>
</periodic-rotating-file-handler>

1. Add the Periodic Log Handler Identifier Information

   The name property sets the unique identifier for this log handler.
   When autoflush is set to "true" the log messages will be sent to the handler's target immediately upon request.

2. Set the level Property

   The level property sets the maximum level of log message that the root logger records.

3. Set the encoding Output

   Use encoding to set the character encoding scheme to be used for the output.

4. Specify the formatter

   Use formatter to list the log formatter used by the log handler.

5. Set the file Object

   The file object represents the file where the output of this log handler is written to. It has two configuration properties: relative-to and path.
   The relative-to property is the directory where the log file is written to. JBoss Enterprise Application Platform 6 file path variables can be specified here. The jboss.server.log.dir variable points to the log/ directory of the server.
   The path property is the name of the file where the log messages will be written. It is a relative path name that is appended to the value of the relative-to property to determine the complete path.

6. Set the suffix Value

   The suffix is appended to the filename of the rotated logs and is used to determine the frequency of rotation. The format of the suffix is a dot (.) followed by a date string, which is parsable by the java.text.SimpleDateFormat class. The log is rotated on the basis of the smallest time unit defined by the suffix. For example, yyyy-MM-dd will result in daily log rotation. See http://docs.oracle.com/javase/6/docs/api/index.html?java/text/SimpleDateFormat.html

7. Set the append Property

   When the append property is set to "true", all messages written by this handler will be appended to an existing file. If set to "false" a new file will be created each time the application server launches. Changes to append require a server reboot to take effect.

Procedure 5.6. Configure the Size Log Handler

<size-rotating-file-handler name="accounts_debug" autoflush="false">
   <level name="DEBUG"/>
   <encoding value="UTF-8"/>
   <file relative-to="jboss.server.log.dir" path="accounts-debug.log"/>
   <rotate-size value="500k"/>
   <max-backup-index value="5"/>
   <formatter>
        <pattern-formatter pattern="%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"/>
    </formatter>
   <append value="true"/>
</size-rotating-file-handler>

1. Add the Size Log Handler Identifier Information

   The name property sets the unique identifier for this log handler.
   When autoflush is set to "true" the log messages will be sent to the handler's target immediately upon request.

2. Set the level Property

   The level property sets the maximum level of log message that the root logger records.

3. Set the encoding Output

   Use encoding to set the character encoding scheme to be used for the output.

4. Set the file Object

   The file object represents the file where the output of this log handler is written to. It has two configuration properties: relative-to and path.
   The relative-to property is the directory where the log file is written to. JBoss Enterprise Application Platform 6 file path variables can be specified here. The jboss.server.log.dir variable points to the log/ directory of the server.
   The path property is the name of the file where the log messages will be written. It is a relative path name that is appended to the value of the relative-to property to determine the complete path.

5. Specify the rotate-size Value

   The maximum size that the log file can reach before it is rotated. A single character appended to the number indicates the size units: b for bytes, k for kilobytes, m for megabytes, g for gigabytes. For example: 50m for 50 megabytes.

6. Set the max-backup-index Number

   The maximum number of rotated logs that are kept. When this number is reached, the oldest log is reused.

7. Specify the formatter

   Use formatter to list the log formatter used by the log handler.

8. Set the append Property

   When the append property is set to "true", all messages written by this handler will be appended to an existing file. If set to "false" a new file will be created each time the application server launches. Changes to append require a server reboot to take effect.

Procedure 5.7. Configure the Async Log Handler

<async-handler name="Async_NFS_handlers">
   <level name="INFO"/>
   <queue-length value="512"/>
   <overflow-action value="block"/>
   <subhandlers>
      <handler name="FILE"/>
      <handler name="accounts-record"/>
   </subhandlers>
</async-handler>

1. The name property sets the unique identifier for this log handler.
2. The level property sets the maximum level of log message that the root logger records.
3. The queue-length defines the maximum number of log messages that will be held by this handler while waiting for sub-handlers to respond.
4. The overflow-action defines how this handler responds when its queue length is exceeded. This can be set to BLOCK or DISCARD. BLOCK makes the logging application wait until there is available space in the queue. This is the same behavior as an non-async log handler. DISCARD allows the logging application to continue but the log message is deleted.
5. The subhandlers list is the list of log handlers to which this async handler passes its log messages.