CODEWITHSUNDEEP
javalog4j
Pradeep Gamage
Pradeep Gamage

Reputation: 615

Log4j Log is not created when jar file run

This is my Student class that used to test log4j. 

public class Student{    
    private static final Logger logger = Logger.getLogger(Student.class.getName());   

    public Student() {  
         PropertyConfigurator.configure("log4j.properties");  
    }

    public static void main(String args[]){  
        logger.log(Level.INFO, "My log4j Test");    
    } 
}

This is my log4j.properties file 

log4j.rootLogger=INFO,Appender1,Appender2
log4j.appender.Appender1=org.apache.log4j.ConsoleAppender
log4j.appender.Appender2=org.apache.log4j.RollingFileAppender
log4j.appender.Appender2.File=C:/Log4j/MyLogExample.log

log4j.appender.Appender1.layout=org.apache.log4j.PatternLayout`  
log4j.appender.Appender1.Target=System.out`   
log4j.appender.Appender1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n`  

log4j.appender.Appender2.layout=org.apache.log4j.PatternLayout`  
log4j.appender.Appender2.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n`  

log4j.appender.Appender2.MaxFileSize=50KB`  
log4j.appender.Appender2.MaxBackupIndex=10`

When I run this program using Eclipse MyLogExample.log file gets created. But after I have created a jar file and run it using the command prompt, the log file is not created.

in console i can see this error. 

log4j:ERROR Could not read configuration file [log4j.properties]. 
java.io.FileNotFoundException: log4j.properties (The system cannot find the file specified)

After I add the following code example, the log file is created even when the jar file run with command prompt. 

PropertyConfigurator.configure("C:\\eclipeworkspace\\Log4jTest\\log4j.properties");

How I can give relative path instead of exact path?

Upvotes: 5

Views: 14165

Answers (3)

akshay
akshay

Reputation: 1

add this plugin if using maven to make your jar runnable wilth all depenencies

<plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>cnnc.bcyr.nvnvn.nch.MainclassName</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
            </plugin>

Upvotes: 0

kjp
kjp

Reputation: 3116

log4j.properties should be in your classpath. Add it to the classpath when running from command line.

A better alternative is to specify the property file using

-Dlog4j.configuration=relative path/log4j.properties

from the command line. In this case you can remove the line PropertyConfigurator.configure("log4j.properties"); from your code - you don't need to do anything in the code to specify the property file.

Upvotes: 2

Rudy
Rudy

Reputation: 7044

Use this : 

ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
URL url = classLoader.getResource("log4j.properties");
File file = new File(url.toURI());

Upvotes: 4

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