CODEWITHSUNDEEP
configurationlog4j
Caffeinated
Caffeinated

Reputation: 12484

How do I get log4J to work - I'm getting "package org.apache.log4j does not exist"

i know this may be a newbie qestion, but I'm having issues with setting up Log4J:

I want to run a log4j demo, and here's my code:

import org.apache.log4j.Logger;
import org.apache.log4j.BasicConfigurator;

public class HelloLOG4j {

  private static final Logger logger = Logger.getLogger(Hello.class);

  public static  void main(String argv[]) {
 BasicConfigurator.configure();
 logger.debug("Hello world.");
 logger.info("What a beatiful day.");
  }
}

I set my Classpath: C:\Users\Adel\Downloads\apache-log4j-1.2.17\log4j-1.2.17.jar in both System and User var's

enter image description here

But when I run my program I still get

errors found:
File: C:\Users\Adel\Desktop\various_topics\JavaProjects\HelloLOG4j.java  [line: 2]
Error: package org.apache.log4j does not exist

I know that I set classpath right - if I run cmd line:

C:\Program Files\Java\jdk1.6.0_20>print %LOG4J_HOME%
C:\Users\Adel\Downloads\apache-log4j-1.2.17\log4j-1.2.17.jar is currently bein
g printed

Upvotes: 10

Views: 29230

Answers (3)

林果皞
林果皞

Reputation: 7823

Just want to remind that don't capitalized Log4j keyword , unlike Logger:

import org.apache.Log4j.Logger; //typo
import org.apache.log4j.Logger; //correct

/usr/share/java/log4j-1.2-api-2.8.2.jar path can be located by issue dpkg -L liblog4j2-java(debian-based) command, then do:

$ sudo javac -cp .:xxx.jar:/usr/share/java/log4j-1.2-api-2.8.2.jar xxx.java

Upvotes: 0

tgkprog
tgkprog

Reputation: 4598

You need to add log4j home to the classpath as the JVM needs the path to the log4j classes

if on windows, you can use 

set classpath=%classpath%;%LOG4J_HOME%

On linux/ ubuntu (much better than windows for development & servers) 

export classpath=$classpath:$LOG4J_HOME

then run your app after adding other paths to classpath like 

set classpath=%classpath%;c:\users\adel\....

You do not need to add log4JHOME again - as %classpath%; will add to the current classpath.

LOG4J_HOME is not known to Java. It is just used by log4j in case of auto config/default config.

On a side note try using the new log4j2 !

Upvotes: 2

Amith Koujalgi
Amith Koujalgi

Reputation: 10952

Can you show how you are trying to compile the code?

And also, try adding the log4j.jar to 'lib' directory and compile with the classpath referencing this jar

Upvotes: 0

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