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Editorial Team
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Asked: 2026-05-29T05:57:03+00:00

My class code is as below. public class LogLevelFilterFileAppender extends FileAppender implements Cloneable{ private

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My class code is as below.

public class LogLevelFilterFileAppender extends FileAppender implements Cloneable{

    private final static String DOT = ".";
    private final static String DASH = "-";
    private static final String ORIGINAL_FILE_NAME = "OrginalLogFileName";

    public LogLevelFilterFileAppender() {}

    public LogLevelFilterFileAppender(Layout layout, String fileName,
                                      boolean append, boolean bufferedIO, int bufferSize)
    throws IOException {
        new FileAppender(layout, fileName, append, bufferedIO, 10);
        new RollingFileAppender(layout, fileName,append);
    }

    public LogLevelFilterFileAppender(Layout layout, String fileName,
                                      boolean append) throws IOException {
        super(layout, fileName, append);
        new RollingFileAppender(layout, fileName,append);
    }

    public LogLevelFilterFileAppender(Layout layout, String fileName)
    throws IOException {
        super(layout, fileName);
        new RollingFileAppender(layout, fileName);
    }

    @Override
    public void activateOptions() {
        MDC.put(ORIGINAL_FILE_NAME, fileName);
        super.activateOptions();
    }

    @Override
    public void append(LoggingEvent event) {
        try {
            setFile(appendLevelToFileName((String) MDC.get(ORIGINAL_FILE_NAME),
                    event.getLevel().toString()), fileAppend, bufferedIO,
                    bufferSize);
        }
        catch (IOException ie) {
            errorHandler
            .error(
                    "Error occured while setting file for the log level "
                    + event.getLevel(), ie,
                    ErrorCode.FILE_OPEN_FAILURE);
        }
        super.append(event);
    }

    private String appendLevelToFileName(String oldLogFileName, String level) {
        if (oldLogFileName != null) {
            final File logFile = new File(oldLogFileName);
            String newFileName = "";
            final String fn = logFile.getName();
            final int dotIndex = fn.indexOf(DOT);
            if (dotIndex != -1) {
                newFileName = fn.substring(0, dotIndex) + DASH + level + DOT
                + fn.substring(dotIndex + 1);
            }
            else {
                newFileName = fn + DASH + level;
            }
            return logFile.getParent() + File.separator + newFileName;
        }
        return null;
    }
}

And my configuration of log4j.properties are as follows.

log4j.rootLogger = DEBUG, fileout
log4j.appender.fileout = com.elitecore.mediation.util.log.LogLevelFilterFileAppender
log4j.appender.fileout.layout.ConversionPattern = %d{MMMMM dd,yyyy HH:mm:ss} %-5p [ %C{1} - %M() - %L ] - %m%n
# log4j.appender.fileout.layout.ConversionPattern = %d{MMMMM dd,yyyy HH:mm:ss} %-5p %c %M():%L - %m%n
# %r [%t] %-5p %c %x - %m%n
# %d{MMMMM dd HH:mm:ss} %-5p %c %M():%L - %m%n
#%d{MMMMM dd HH:mm:ss} %6p %c %M() : %m%n
log4j.appender.fileout.layout = org.apache.log4j.PatternLayout
log4j.appender.fileout.File = /usr/local/mediation/logs/mediation-logs.log

This is creating a log for different types, for example, DEBUG, ERROR, and INFO in different log files. But what limitation is it? It is creating larger and larger log files. I want to make log files for, say, of 5 MB, and previous logs should be removed. How can I do that? When I try with RollingFile Appender, I get the below log files only.

[root@manage logs]# ls -1
mediation-logs-DEBUG.log
mediation-logs-ERROR.log
mediation-logs-INFO.log
mediation-logs-INFO.log.1
mediation-logs-INFO.log.2
mediation-logs.log

Rolling of log files ERROR,DEBUG is not done, but INFO is done.

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1 Answer

  1. Editorial Team

    I suggest you derive from RollingFileAppender instead of FileAppender. This will give you the possibility to define how large the log-files will grow, and how many “old” ones you want to keep. Check out the manual on how to use it later in your log4j.propertiers.

    If I understand correctly, you want one file per log-level, is that correct? If so, I suggest you follow this FAQ-Entry rather than “rolling” your own solution 🙂

    Matching exact log-levels

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