JavaMap(3) User Contributed Perl Documentation JavaMap(3)

# [NAME](#NAME)

Log::Log4perl::JavaMap - maps java log4j appenders to Log::Dispatch classes

# [SYNOPSIS](#SYNOPSIS)

```
     ###############################
     log4j.appender.FileAppndr1        = org.apache.log4j.FileAppender
     log4j.appender.FileAppndr1.File   = /var/log/onetime.log
     log4j.appender.FileAppndr1.Append = false
     log4j.appender.FileAppndr1.layout = org.apache.log4j.PatternLayout
     log4j.appender.FileAppndr1.layout.ConversionPattern=%d %4r [%t] %-5p %c %x - %m%n
     ###############################
```

# [DESCRIPTION](#DESCRIPTION)

If somebody wants to create an appender called "org.apache.log4j.ConsoleAppender", we want to translate it to Log::Dispatch::Screen, and then translate the log4j options into Log::Dispatch parameters..

## [What's Implemented](#What)

(Note that you can always use the Log::Dispatch::* module. By 'implemented' I mean having a translation class that translates log4j options into the Log::Dispatch options so you can use log4j rather than log4perl syntax in your config file.)

Here's the list of appenders I see on the current (6/2002) log4j site.

These are implemented

```
    ConsoleAppender     - Log::Dispatch::Screen
    FileAppender        - Log::Dispatch::File
    RollingFileAppender - Log::Dispatch::FileRotate (by Mark Pfeiffer)
    JDBCAppender        - Log::Log4perl::Appender::DBI
    SyslogAppender      - Log::Dispatch::Syslog
    NTEventLogAppender  - Log::Dispatch::Win32EventLog
```

These should/will/might be implemented

```
    DailyRollingFileAppender - 
    SMTPAppender     - Log::Dispatch::Email::MailSender
```

These might be implemented but they don't have corresponding classes in Log::Dispatch (yet):

```
    NullAppender
    TelnetAppender
```

These might be simulated

```
    LF5Appender - use Tk?
    ExternallyRolledFileAppender - catch a HUP instead?
```

These will probably not be implemented

```
    AsyncAppender
    JMSAppender
    SocketAppender - (ships a serialized LoggingEvent to the server side)
    SocketHubAppender
```

# [ROLL YOUR OWN](#ROLL_YOUR_OWN)

Let's say you've in a mixed Java/Perl environment and you've come up with some custom Java appender with behavior you want to use in both worlds, "myorg.customAppender". You write a Perl appender with the same behavior "Myorg::CustomAppender". You want to use one config file across both applications, so the config file will have to say 'myorg.customAppender'. But the mapping from "myorg.customAppender" to "Myorg::CustomAppender" isn't in this JavaMap class, so what do you do?

In your Perl code, before you call **Log::Log4perl::init()**, do this:

```
    $Log::Log4perl::JavaMap::user_defined{'myorg.customAppender'} = 
        'Myorg::CustomAppender';
```

and you can use 'myorg.customAppender' in your config file with impunity.

# [SEE ALSO](#SEE_ALSO)

http://jakarta.apache.org/log4j/docs/

# [LICENSE](#LICENSE)

Copyright 2002-2026 by Mike Schilli <m@perlmeister.com> and Kevin Goess <cpan@goess.org>.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

2026-08-17 perl v5.44.0

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Document: Log::Log4perl::JavaMap(3pm) from perl-log-log4perl 1.58-r1 (Chainguard OS)
Source: https://github.com/mschilli/log4perl.git