Actually created new logger from scratch through code:
Here is relevant code
where pLogFilename is something like "MyServer.log"
public static void initialize(String pLogFilename, String
pConfigurationFilename) throws IOException {
// Make sure the filename has the proper date format and is escaped
to
// allow passing through a SimpleDateFormat
String _strPrefix = "";
String _strSuffix = "";
int i = pLogFilename.lastIndexOf('.');
if (i >= 0) {
_strPrefix = pLogFilename.substring(0, i);
_strSuffix = pLogFilename.substring(i);
} else {
_strPrefix = pLogFilename;
}
pLogFilename = "'" + _strPrefix + "'yyyyMMdd";
if (_strSuffix.length() > 0)
pLogFilename += "'" + _strSuffix + "'";
createLogger(pConfigurationFilename, _strPrefix, "yyyyMMdd",
_strSuffix);
}
public static void createLogger(String pConfigFilename,
String plogFilenamePrefix,
String pLogFilenameDateFormat,
String pLogFileNameSuffix) throws
IOException {
SimpleDateFormat _sdf = new
SimpleDateFormat(pLogFilenameDateFormat);
String _filename = plogFilenamePrefix + _sdf.format(new Date()) +
pLogFileNameSuffix;
createLogger(pConfigFilename, _filename,
plogFilenamePrefix + "%d{" + pLogFilenameDateFormat + "}" +
pLogFileNameSuffix);
}
/**
* @param pConfigurationFilename
* @param pLogFilename
* @param pLogFilenamePattern
* @throws IOException
*/
public static void createLogger(String pConfigurationFilename,
String pLogFilename,
String pLogFilenamePattern) throws
IOException {
FileInputStream fileInputStream = new
FileInputStream(pConfigurationFilename);
ConfigurationSource configurationSource = new
ConfigurationSource(fileInputStream);
ConfigurationBuilder<BuiltConfiguration> configurationBuilder =
ConfigurationBuilderFactory.newConfigurationBuilder();
configurationBuilder.setConfigurationSource(configurationSource);
AppenderComponentBuilder log4jFileAppenderBuilder =
configurationBuilder.
newAppender("DailyRollingFileAppender", "RollingFile");
log4jFileAppenderBuilder.addAttribute("filename", pLogFilename);
log4jFileAppenderBuilder.addAttribute("filePattern",
pLogFilenamePattern);
// set up roll-over
ComponentBuilder triggeringPolicy =
configurationBuilder.newComponent("Policies")
.addComponent(configurationBuilder.newComponent("TimeBasedTriggeringPolicy").addAttribute("interval",
"1"));
log4jFileAppenderBuilder.addComponent(triggeringPolicy);
// Configure the PatternLayout
LayoutComponentBuilder layoutComponentBuilder =
configurationBuilder.newLayout("PatternLayout").addAttribute("pattern",
"%d{ABSOLUTE} %-5p %m%n");
log4jFileAppenderBuilder.add(layoutComponentBuilder);
// Add it back into configuration
configurationBuilder.add(log4jFileAppenderBuilder);
// Set up root
RootLoggerComponentBuilder rootLogger =
configurationBuilder.newRootLogger().
add(configurationBuilder.newAppenderRef("DailyRollingFileAppender"));
configurationBuilder.add(rootLogger);
// Actually use it
Configurator.reconfigure(configurationBuilder.build());
//System.out.println("\n*******************************************
LOG CONFIG ************************");
// this is for debug - will print out what was created
configurationBuilder.writeXmlConfiguration(System.out);
}
On Fri, Aug 12, 2022 at 6:18 PM Gary Gregory <garydgreg...@gmail.com> wrote:
> Joel,
>
> Is it possible to use Log4j 2's much richer feature set as is? Perhaps you
> could explain what is it your old appender does that requires custom code.
>
> Gary
>
> On Fri, Aug 12, 2022, 15:35 Joel Griffith <jgrif...@nd.edu> wrote:
>
> > I have a Java application containing a package written to use Log4j v1.
> I
> > am struggling to update this package to use Log4j v2 to remediate its
> > security vulnerabilities.
> >
> > The package contains a custom Appender that subclasses Log4j v1's
> > FileAppender. I am stumped at how to convert this file to Log4j v2. In
> > Log4j v2, the FileAppender class is 'final' and cannot be subclassed, so
> I
> > cannot create a new version of the custom Appender that mirrors the
> first.
> > More importantly, perhaps, is that the Log4j v2 FileAppender is a Plugin
> > and completely different in structure from the Log4j v1 FileAppender.
> >
> > I found this page that ostensibly explains how to extend Log4j:
> > https://logging.apache.org/log4j/2.x/manual/extending.html#Appenders
> > but it contains no information about actually extending Appenders or
> > procedures for accomplishing an equivalent goal.
> >
> > Is there any reasonable way of converting this custom Appender from Log4j
> > v1 to v2?
> >
> > Thanks,
> > Joel
> >
>
--
☮
