Dynamically defined output log file in log4j

I am trying to generate an output log file dynamically using log4j. I have standard configuration XML file for log4j where I have an appender configuired. In my java code I am trying to add appender to the logger and then change an output file:
<code>
Logger logger = Logger.getLogger(ClassFSTest.class);
Appender rfa =logger.getAppender("rolling");
rfa.setFile(myFileName);
rfa.activateOprions();
</code>
However getAppender method returns NULL, but at the same time I have an Appender named "rolling" in my confuiguration. And if I use standard output mechanism like "logger.info()" the message is being written into the defined file.
thanks in advance.

Hope the following link will address the solution for your problem:
http://cognitivecache.blogspot.com/2008/08/log4j-writing-to-dynamic-log-file-for.html

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I assume that when you change the name of the expected log file in the properties file, the new empty file is that name, correct?
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You have to configure the temp logger so that it does not send its info on to the root logger.
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FinancialUtilService, downloadESSJobExecutionDetails method is not uploading ESS job output/log files to UCM.

Hi,
We are invoking financialUtilService web service using HTTP Proxy Client to upload data files and submit ESS and to get ESS job log files. We are able to successfully upload and submit ESS job. But downloadESSJobExecutionDetails is not uploading logs/out files to UCM.
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Below output is returned:
Ess Job status:SUCCEEDED
Ess Job output:[com.oracle.xmlns.apps.financials.commonmodules.shared.financialutilservice.DocumentDetails@5354a]
Account: fin$/payables$/import$
File Name: null
Document Title: Uma Test Import
DocumentName: 84037.zip
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Hey
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Dynamic bad and Log file names!!

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Hi
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I want to logs to be redirected to the RootDir/logs/Error.log.
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Please follow the following steps, will work.
To enable log4j logging to a file on lunar pages do the following:
1) Create a servlet class that will initialize log4j. Here is
the code:
package logging;
import org.apache.log4j.PropertyConfigurator;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Log4jInit extends HttpServlet {
public
void init() {
String prefix = getServletContext().getRealPath("/");
String file = getInitParameter("log4j-init-file");
// if the log4j-init-file is not set, then no point in trying
if(file != null) {
PropertyConfigurator.configure(prefix+file);
public
void doGet(HttpServletRequest req, HttpServletResponse res) {
2) In your web.xml file add the following entry:
<servlet>
<servlet-name>log4j-init</servlet-name>
<servlet-class>logging.Log4jInit</servlet-class>
<init-param>
<param-name>log4j-init-file</param-name>
<param-value>WEB-INF/classes/log4j.lcf</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
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4) Add logging to your class. Here is an example:
import org.apache.log4j.Logger;
public class Example {
static Logger logger = Logger.getLogger(Example.class);
public void doSomething() {
logger.debug("testing logging");
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Log4j problem for backing up the log file

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Thanks..
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Hello again Tom and thanks for your help!
No, I didn't optimize any media though I've rendered proxies for all media. I have about 14TB of R3D footage on five external harddrives, it's a feature. The proxies and sound files which I copied to the library makes the library file that big. I can't consolidate all media, as far as I know, since I don't have a drive even close to the size of all the R3D footage.
In terms of copying I have only tried the good old "copy/paste" method. I have never used any of those programs you mentioned. Can those programs be used to copy certain files or will they copy an entire drive?
Will the automatic back-ups FCPX does every 15 minutes save my timelines if something would go wrong and the library file would dissappear? I don't fully understand how that back-up process works. I could always render new proxies, though it would take time, but re-editing all those timelines is a whole other thing. Important to note here is that I'm used to Premiere Pro and the "old" FCP which is why all of this is so confusing.
Thank you again!

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Dear all,
I get every day 3 log files with ftp from a Solaris Server to a Windows 2000 Server machine. In this Windows machine, we have an Oracle Database 9.2. These log files are in the following format: in<date>.log i.e. in20070429.log.
I would like to load this log file's data to an Oracle table every day and I would like to use SQL Loader for this job.
The problem is that the log file name is different every day.
How can I give this variable log file name in the Control file, which is used for the SQL Loader?
file.ctl
LOAD DATA
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APPEND INTO TABLE CHAT_SL
FIELDS TERMINATED BY WHITESPACE
TRAILING NULLCOLS
(SL1 DATE "Mon DD, YYYY HH:MI:SS FF3AM",
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SL3 DATE "Mon DD, YYYY HH:MI:SS FF3AM",
SL4 char,
SL5 char,
SL6 char,
SL7 char,
SL8 char,
SL9 char,
SL10 char,
SL11 char,
SL12 char,
SL13 char,
SL14 char,
SL15 char)
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I thought of renaming the log file to an instant name, such as in.log, but how can I distinguish the desired log file, from the other two?
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I don't have a direct solution for your problem.
However if you invoke the SQL loader from an Oracle stored procedure, it is possible to dynamically set control\log file.
# Grant previleges to the user to execute command prompt statements
BEGIN
dbms_java.grant_permission('bc4186ol','java.io.FilePermission','C:\windows\system32\cmd.exe','execute');
END;
* Procedure to execute Operating system commands using PL\SQL(Oracle script making use of Java packages
CREATE OR REPLACE AND COMPILE JAVA SOURCE NAMED "Host" AS
import java.io.*;
public class Host {
public static void executeCommand(String command) {
try {
String[] finalCommand;
finalCommand = new String[4];
finalCommand[0] = "C:\\windows\\system32\\cmd.exe";
finalCommand[1] = "/y";
finalCommand[2] = "/c";
finalCommand[3] = command;
final Process pr = Runtime.getRuntime().exec(finalCommand);
new Thread(new Runnable() {
public void run() {
try {
BufferedReader br_in = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String buff = null;
while ((buff = br_in.readLine()) != null) {
System.out.println("Process out :" + buff);
try {Thread.sleep(100); } catch(Exception e) {}
catch (IOException ioe) {
System.out.println("Exception caught printing process output.");
ioe.printStackTrace();
}).start();
new Thread(new Runnable() {
public void run() {
try {
BufferedReader br_err = new BufferedReader(new InputStreamReader(pr.getErrorStream()));
String buff = null;
while ((buff = br_err.readLine()) != null) {
System.out.println("Process err :" + buff);
try {Thread.sleep(100); } catch(Exception e) {}
catch (IOException ioe) {
System.out.println("Exception caught printing process error.");
ioe.printStackTrace();
}).start();
catch (Exception ex) {
System.out.println(ex.getLocalizedMessage());
public static boolean isWindows() {
if (System.getProperty("os.name").toLowerCase().indexOf("windows") != -1)
return true;
else
return false;
* Oracle wrapper to call the above procedure
CREATE OR REPLACE PROCEDURE Host_Command (p_command IN VARCHAR2)
AS LANGUAGE JAVA
NAME 'Host.executeCommand (java.lang.String)';
* Now invoke the procedure with an operating system command(Execyte SQL-loader)
* The execution of script would ensure the Prod mapping data file is loaded to PROD_5005_710_MAP table
* Change the control\log\discard\bad files as apropriate
BEGIN
Host_Command (p_command => 'sqlldr system/tiburon@orcl control=C:\anupama\emp_join'||1||'.ctl log=C:\anupama\ond_lists.log');
END;Does that help you?
Regards,
Bhagat

Regarding Log4.xml to add timestamp in log file

Dear Sir,
Could you guide me how to append the timestamp got appeared in log file which has been generated from Log4j.xml?? This is my Log4j.xml.
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thanks in advance mani

Dear Sir,
Could you guide me how to append the timestamp got appeared in log file which has been generated from Log4j.xml?? This is my Log4j.xml.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration
xmlns:log4j="http://jakarta.apache.org/log4j/">


<appender name="CM" class="org.apache.log4j.FileAppender">
     <param name="File" value="customer_master.log"/>
     <param name="Threshold" value="DEBUG"/>
     <param name="Append" value="true"/>
     <param name="MaxFileSize" value="1MB"/>
     <param name="MaxBackupIndex" value="1"/>
    <layout class="org.apache.log4j.PatternLayout">
      
      <param name="ConversionPattern" value="%C:%M:%L - %m%n"/>
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</appender>
<appender name="stdout" class="org.apache.log4j.ConsoleAppender">
    <param name="Threshold" value="INFO"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%C:%M:%L - %m%n"/>
    </layout>
</appender>


<logger name="com.tf" additivity="true">
    <priority value="DEBUG"/>
    <appender-ref ref="CM"/>
</logger>


<root>
    <appender-ref ref="stdout"/>
</root>
</log4j:configuration>It would be great, if you could give the solution for this. There is no probs in getting timestamp from the folowing properties file Log4j.properties:
# Configure the logger to output info level messages into a rolling log file.
log4j.rootLogger=DEBUG, R
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.DatePattern='.'yyyy-MM-dd
# Edit the next line to point to your logs directory.
# The last part of the name is the log file name.
log4j.appender.R.File=c:/temp/log/${log.file}
log4j.appender.R.layout=org.apache.log4j.PatternLayout
# Print the date in ISO 8601 format
log4j.appender.R.layout.ConversionPattern=%d %-5p %c %L - %m%nthanks in advance

Node.js loss of permission to write/create log files

We have been operating Node.js as a worker role cloud service. To track server activity, we write log files (via log4js) to C:\logs
Originally the logging was configured with size-based roll-over. e.g. new file every 20MB. I noticed on some servers the sequencing was uneven
socket.log <-- current active file
socket.log.1
socket.log.3
socket.log.5
socket.log.7
it should be
socket.log.1
socket.log.2
socket.log.3
socket.log.4
Whenever there is uneven sequence, i realise the beginning of each file revealed the Node process was restarted. From Windows Azure event log, it further indicated worker role hosting mechanism found node.exe to have terminated abruptly.
With no other information to clue what is exactly happening, I thought there was some fault with log4js roll over implementation (updating to latest versions did not help). Subsequently switched to date-based roll-over mode; saw that roll-over happened every
midnight and was happy with it.
However some weeks later I realise the roll-over was (not always, but pretty predictably) only happening every alternate midnight.
socket.log-2014-06-05
socket.log-2014-06-07
socket.log-2014-06-09
And each file again revealed that midnight the roll-over did not happen, node.exe was crashing again. Additional logging on uncaughtException and exit happens showed nothing; which seems to suggest node.exe was killed by external influence (e.g. process
kill) but it was unfathomable anything in the OS would want to kill node.exe.
Additionally, having two instances in the cloud service, we observe the crashing of both node.exe within minutes of each other. Always. However if we had two server instances brought up on different days, then the "schedule" for crashing would
be offset by the difference of the instance launch dates.
Unable to trap more details what's going on, we tried a different logging library - winston. winston has the additional feature of logging uncaughtExceptions so it was not necessary to manually log that. Since winston does not have date-based roll-over it
went back to size-based roll-over; which obviously meant no more midnight crash.
Eventually, I spotted some random midday crash today. It did not coincide with size-based rollover event, but winston was able to log an interesting uncaughtException.
"date": "Wed Jun 18 2014 06:26:12 GMT+0000 (Coordinated Universal Time)",
"process": {
"pid": 476,
"uid": null,
"gid": null,
"cwd": "E:
approot",
"execPath": "E:\\approot
node.exe",
"version": "v0.8.26",
"argv": ["E:\\approot\\node.exe", "E:\\approot\\server.js"],
"memoryUsage":
{ "rss": 80433152, "heapTotal": 37682920, "heapUsed": 31468888 }
"os":
{ "loadavg": [0, 0, 0], "uptime": 163780.9854492 }
"trace": [],
"stack": ["Error: EPERM, open 'c:\\logs\\socket1.log'"],
"level": "error",
"message": "uncaughtException: EPERM, open 'c:\\logs\\socket1.log'",
"timestamp": "2014-06-18T06:26:12.572Z"
Interesting question: the Node process _was_ writing to socket1.log all along; why would there be a sudden EPERM error?
On restart it could resume writing to the same log file. Or in previous cases it would seem like the lack of permission to create a new log file.
Any clues on what could possibly cause this? On a "scheduled" basis per server? Given that it happens so frequently and in sync with sister instances in the cloud service, something is happening in the back scenes which I cannot put a finger to.
thanks
The melody of logic will always play out the truth. ~ Narumi Ayumu, Spiral

Hi,
It is strange. From your description, how many instances of your worker role? Do you store the log file on your VM local disk? To avoid this question, the best choice is you could store your log file into azure storage blob . If you do this, all log
file will be stored on blob storage. About how to use azure blob storage, please see this docs:
http://azure.microsoft.com/en-us/documentation/articles/storage-introduction/
Please try it.
If I misunderstood, please let me know.
Regards,
Will
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Very weird issue with server logging when using log4j.properties file

I'm using log4j logging. In log4j.properties the root logger is set up to use the ServerLoggingAppender class so that all our application logs go to the main server logfile. In addition, there are several appenders defined for specific components, with output going to specific per-component log files. Everything is going fine until I launch the server console. At this point all of those per-component log files get wiped out (zero length) and some non-ASCII lines are written to at least one of these files, after which the logs appear to be fine. The main server log file does not appear to be affected (because the root logger is set to "warn" level, while component-specific loggers are set to trace, the contents in these files is different; however I tried disabling all the other appenders and turning the root logger up to trace, and that still did not re-create the problem in the main server log file.
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Figured it out.
We were passing in the configuration for log4j as -Dlog4j.configuration=file:/<properties file> and this was added to the command line for both the managed and admin servers. Problem is that the console app starts its own instance of log4j, and when it reads the configuration for the appenders it initializes or rolls over the files. At some point we have two JVMs accessing the same files, so some corruption is bound to happen.
I'm not clear why the .xml file made a difference, but earlier we had been passing the log4j configuration as a jar file placed in the domain/lib folder, so perhaps the designer reverted to that (placed the log4j.xml file in a jar in lib, and not simply changed the -Dlog4j.configuration=file:/ option.

Configure log4j to write to different log files conditionally

Hi folks,
Is there is way log4j could be configured to write to multiple log files conditionally? Let me try to explain what i am trying to do.
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I've seen how to configure log4j based on classes from different package, but not sure on this one. Any clue would be much appreciated.

lgmqy2000 wrote:
I have two classes DatabaseChecker and FTPChecker extends Checker class. Within Checker class, there is a method logTestResult(CheckerType c, boolean isFailed, int retry, int isMaxRetryExceeded). Depending on the CheckerType(database or FTP), I need to write log outputs to different files (dbchecker.log or ftpchecker.log). How do i configure log4j to do this?
if (checker.isType(CheckerType.DATABASE)) {
    dbLogger.info(someMessage);
} else if (checker.isType(CheckerType.FTP)) {
    ftpLogger.info(someMessage);
} else {
    defaultLogger.info(someMessage);
}~

Dynamically defined output log file in log4j

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