Adding more than one syslog appenders with different hostname and port at runtime

[Ganesh S]

Hello,
I'm trying to create different logger with different hostname and port for
different client requests to the server.
If a new client request comes, I will store the information in the thread
local object and based on the information I need to append a new logger
object to the existing configuration object using CompositeConfiguration
and update loggers in the logger context.
I'm using the name of the logger object not to have a package level
hierarchy but just as a named (client name) logger.

Currently I'm getting the below error when I try to append new syslog using
CompositeConfiguration
at the line
logContext.reconfigure(compositeConfiguration);

ERROR StatusConsoleListener Appender references must contain a reference
ERROR StatusConsoleListener Null object returned for AppenderRef in Logger.
ERROR StatusConsoleListener No appender name provided
ERROR StatusConsoleListener Could not create plugin of type class
org.apache.logging.log4j.core.appender.SyslogAppender for element Syslog
 org.apache.logging.log4j.core.config.ConfigurationException: Arguments
given for element Syslog are invalid: field 'name' has invalid value 'null'
at
org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.injectFields(PluginBuilder.java:199)
.....
at
org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:621)
at
org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:715)
ERROR StatusConsoleListener Null object returned for Syslog in Appenders.


Below is my implementation

ConfigurationBuilder<BuiltConfiguration> builder1 =
ConfigurationBuilderFactory.newConfigurationBuilder();
    AppenderComponentBuilder syslogAppender1 =
builder1.newAppender("syslog", "Syslog")
        .addAttribute("protocol", "UDP")
        .addAttribute("host", hostname)
        .addAttribute("port", port1)
        .addAttribute("appName", "serviceName")
        .addAttribute("id", "serviceName")
        .addAttribute("facility", "LOCAL0")
        .addAttribute("newLine", true)
        .addAttribute("format", "RFC5424")
        .addAttribute("ignoreExceptions", false);
syslogAppender1.add(builder1.newFilter("ThresholdFilter",
Filter.Result.ACCEPT, Filter.Result.DENY)
.addAttribute("level", Level.DEBUG));
builder1.add(syslogAppender1);

builder1.add(builder1.newLogger("client1", Level.DEBUG)
               .add(builder1.newAppenderRef("syslog"))
               .addAttribute("additivity", false));
Configurator.reconfigure(builder1.build());

Logger logger = LogManager.getLogger("client1");
logger.info("client1 message1");

ConfigurationBuilder<BuiltConfiguration> builder =
ConfigurationBuilderFactory.newConfigurationBuilder();
AppenderComponentBuilder syslogAppender = builder.newAppender("syslog1",
"Syslog")
        .addAttribute("protocol", "UDP")
        .addAttribute("host", hostname)
        .addAttribute("port", port2)
        .addAttribute("appName", "serviceName")
        .addAttribute("id", "serviceName")
        .addAttribute("facility", "LOCAL0")
        .addAttribute("newLine", true)
        .addAttribute("format", "RFC5424")
        .addAttribute("ignoreExceptions", false);

 syslogAppender.add(builder.newFilter("ThresholdFilter",
Filter.Result.ACCEPT, Filter.Result.DENY)
        .addAttribute("level", Level.DEBUG));
 builder.add(syslogAppender);

 builder.add(builder.newLogger("client2", Level.DEBUG)
               .add(builder.newAppenderRef("syslog1"))
               .addAttribute("additivity", false));

LoggerContext logContext = LoggerContext.getContext(false);
org.apache.logging.log4j.core.config.Configuration configurationcore =
logContext.getConfiguration();
List<AbstractConfiguration> configurationList = new ArrayList<>();
if (configurationcore != null)
configurationList.add((AbstractConfiguration) configurationcore);
org.apache.logging.log4j.core.config.Configuration newconfig =
builder.build();
configurationList.add((AbstractConfiguration) newconfig);
CompositeConfiguration compositeConfiguration = new
CompositeConfiguration(configurationList);
logContext.reconfigure(compositeConfiguration);
logContext.updateLoggers();

 Logger logger1 = LogManager.getLogger("client2");
 logger1.info("client2 message1");
 logger1.info("client2 message2");
 logger.info("client1 message2");
 logger1.info("client2 message3");
 logger.info("client1 message3");


Thank you,
Ganesh S