CODEWITHSUNDEEP
java
vikeng21
vikeng21

Reputation: 531

Executing Jar File in JDK 1.6 giving issues

I have created a simple project in java using eclipse ide to test the log4j functionality. I need to run the application from the command prompt using the jar tool in java. The logtest.java file is simple java file which defines a logger as below. It is referencing a Logger which is in another Jar file. below is directory structure.

package com;

import org.apache.log4j.Logger;

public class logtest {

    private static Logger logger = Logger.getLogger(logtest.class);

    public static void main(String[] args) {
        System.out.println("---------------HIIIIII-----------");
    }

Below is the directory structure that i have created in the project in eclipse.

src/com/logtest.java

lib/log4j-1.2.17.jar

the manifest files entries are as below and i have manually created the maifest file.

Manifest-Version: 1.0
Main-Class: com.logtest
Class-Path: lib/log4j-1.2.17.jar

The contents of the Jar file are as below which i unzipped using the jar utility.

META-INF/MANIFEST.MF
.project
com/logtest.class
manifest.mf
lib/log4j-1.2.17.jar
.classpath

I have exported the jar file and when i try to run using the commond java -jar JarTest2.jar i am getting the following error

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logger
    at com.logtest.<clinit>(logtest.java:6)

Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 1 more

I know its a class not found exception but strange thing is that the same jar when i create using jdk1.5 and run command tool the jar runs successfully and the java class executes without any error.

I have no idea why this is going as everything is the same.

mine is a 64 bit windows 7 machine and the other machine where it is running is a 32 bit XP machine.

Of course the version of eclipse ide is different on both machines.

Can you please let me know is there something wrong about what i am doing or am i missing something else.

Thanks Vikeng21

Upvotes: 2

Views: 1502

Answers (2)

MadProgrammer
MadProgrammer

Reputation: 347314

I'm pretty sure that Java doesn't support embedded Jars. I'd recommend moving the lib/log4j-1.2.17.jar file out to the file system (so that it creates a sub folder ./lib within the same drctory as your executable Jar & see if that makes a difference.

If you really want to use embedded Jars, you could take a read of One-Jar

You should have a directory structure of

.\JarTest2.jar
.\lib\log4j-1.2.17.jar

On your file system. The log4j Jar shouldn't be imbedded (contained within) the JarTest2.jar file

Upvotes: 1

Sai Ye Yan Naing Aye
Sai Ye Yan Naing Aye

Reputation: 6738

Please check your log4j.jar is duplicated. For example one log4j.jar was under lib folder and other was under Referenced libraries of eclipse. If it is duplicated, remove one jar and redeploy again.

Upvotes: 0

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