How to save log output in a file in linux

Question

I need to create an accessible log file in our linux server. A java program is used to create a log.

In my console

Sep 11, 2014 3:03:05 PM com.gsis.bom.Log appLog
SEVERE: test 1
Sep 11, 2014 3:03:06 PM com.gsis.bom.Log appLog
INFO: test 2
Sep 11, 2014 3:03:06 PM com.gsis.bom.Log appLog
INFO: test 3

But this messages should be saved in a file in linux. For e.g. /home/logs How can I do it?

THANK YOU

EDIT

LogManager lm = LogManager.getLogManager();
          Logger logger;
          FileHandler fh = new FileHandler("log_test.txt");

          logger = Logger.getLogger("LoggingExample1");

          lm.addLogger(logger);
          logger.setLevel(Level.INFO);
          fh.setFormatter(new XMLFormatter());

          logger.addHandler(fh);
          logger.log(Level.SEVERE, "test 1");
          logger.log(Level.INFO, "test 2");
          logger.log(Level.INFO, "test 3");
          fh.close();

This is the code that I am using. Ok I can see it in my console. But I need the messages to be saved in a file. For example at /home/logs/log.txt in our linux server

Use output redirection operator with your java program. e.g. `your_java_prog_binary > /home/logs.txt` — iqstatic, Sep 11 '14 at 07:08

score 2 · Answer 1 · answered Sep 11 '14 at 07:12

2

You can use class something like below,

import org.apache.log4j.Logger;

public class CreateLog{

    static Logger logEntry = Logger.getLogger(
                  CreateLog.class.getName());

    public void testLog(){
        logEntry.info("some information message");
        logEntry .error("some error message");
    }
}

answered Sep 11 '14 at 07:12

shrishinde

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I edited my question and put some codes. I need a code that will save it to our linux server – user3264438 Sep 11 '14 at 07:19
As far as log4j is concerned, you have to specify key(log4j.appender.FILE.File) for file name and path in configuration file(log4j.properties) – shrishinde Sep 11 '14 at 07:29

score 0 · Answer 2 · edited May 23 '17 at 11:57

0

Seems that you are using java.util.logging. In that case, you can add an appender programmatically as in the following example.

// the maximum number of bytes to write to any one file
int limit = 5 * 1024 * 1024; 

// the number of files to use
int count = 10;              

Handler handler = new FileHandler("/home/logs/log_test.txt", limit, count);
Logger.getLogger("").addHandler(handler);

You may want to see Where does java.util.logging.Logger store their log, Java logging opening "too many" logfiles and Java Logging API generating empty log files

edited May 23 '17 at 11:57

Community

1
1

answered Sep 11 '14 at 07:21

Paul Vargas

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Im going to try this @Paul Vargas – user3264438 Sep 11 '14 at 07:42
It's not working. I've got an exception `Exception thrown: java.io.IOException: Couldn't get lock for /home/logs/log_test.txt java.io.IOException: Couldn't get lock for /home/logs/log_test.txt` – user3264438 Sep 11 '14 at 07:59
@user3264438 See http://stackoverflow.com/questions/20111525/java-io-ioexception-couldnt-get-lock-for – Paul Vargas Sep 11 '14 at 12:32

How to save log output in a file in linux

2 Answers2