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From Mikael Ståldal (JIRA) <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-952) FAQ: How do I configure log4j2 programmatically in code without a configuration file?
Date Thu, 13 Aug 2015 08:08:46 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14694867#comment-14694867
] 

Mikael Ståldal commented on LOG4J2-952:
---------------------------------------

I can see a problem with this, a simple spelling mistake would give you a broken configuration
without the compiler noticing. This can be fixed by returning an Java object to be used instead
of String refs. So it would look like this:

{code}
Appender console = addAppender("console", CONSOLE, pattern);
LoggerConfig server = addConfig("server", TRACE, true);
LoggerConfig telnet = addConfig("telnet", DEBUG, true);
LoggerConfig telnetFile = addConfig("telnet.file", WARN, true);
addAppenderTo(console, Configuration.ROOT);
Appender optionsLog = addAppender("optionsLog", FILEAPPEND, pattern);
addAppenderTo(optionsLog, telnetFile);
{code}

> FAQ: How do I configure log4j2 programmatically in code without a configuration file?
> -------------------------------------------------------------------------------------
>
>                 Key: LOG4J2-952
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-952
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: API, Configurators, Documentation
>    Affects Versions: 2.1
>            Reporter: Joe Merten
>
> I found [this link|http://logging.apache.org/log4j/2.x/faq.html#config_from_code] which
said:
> {quote}
> You could use the static method #initialize(String contextName, ClassLoader loader, String
configLocation) in org.apache.logging.log4j.core.config.Configurator. (You can pass null for
the class loader.) Be aware that this class is not part of the public API so your code may
break with any minor release.
> {quote}
> This documentation is unclear because it points to a member function which needs a filename
{{configLocation}} where as the topic is »without a configuration file«.
> It shoud rather point to the member function {{org.apache.logging.log4j.core.config.Configurator.initialize(ClassLoader
loader, ConfigurationSource source)}}.
> Example:
> {code:java}
> import org.apache.logging.log4j.core.config.ConfigurationSource;
> import org.apache.logging.log4j.core.config.Configurator;
> final String hardCodedXmlConfig =
>         "<?xml version='1.0' encoding='UTF-8'?>\n" +
>         "<Configuration status='INFO'>\n" +
>         "  <Appenders>\n" +
>         "    <Console name='Console' target='SYSTEM_OUT'>\n" +
>         "      <PatternLayout pattern='%d{HH:mm:ss.SSS} [%t] %-5level %logger{36}
- %msg%n'/>\n" +
>         "    </Console>\n" +
>         "  </Appenders>\n" +
>         "  <Loggers>\n" +
>         "    <Root level='debug'>\n" +
>         "      <AppenderRef ref='Console'/>\n" +
>         "    </Root>\n" +
>         "  </Loggers>\n" +
>         "</Configuration>\n";
> try {
>     Configurator.initialize(null, new ConfigurationSource(new ByteArrayInputStream(hardCodedXmlConfig.getBytes())));
> } catch (IOException e) {
>     e.printStackTrace();
> }
> {code}



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