Failed to load Main-Class manifest attribute from HelloWorld.jar - SOLVED

When i try to compile a jar file using the below command in command prompt,

java -jar HelloWorld.jar
i got an error like

Failed to load Main-Class manifest attribute from
HelloWorld.jar

This is due to the missing launch configuration. 

The Main-Class header needs to be in the manifest for the JAR file - this is metadata about things like other required libraries. See the Sun documentation for how to create an appropriate manifest.

Simply, i followed the eclipse for exporting the jar file instead of remembering all the commands.
















and choose as specified below.























and choose the following options below.

1. Choose your class that contains MAIN method.
2. Choose the destination of Jar file
3. Once, one and two steps are done, Click Finish.
























Now run the same command via command prompt, 

java -jar HelloWorld.jar
This will not throw any Main-Class error.


Enjoy Learning!

Comments

Post a Comment

Popular posts from this blog

[SOLVED] - RSYNC not executing via CRON

The below error was faced and tried for online answers, made my head to heat for couple of days and finally i was able to crack the solution for the below issue. umasarath@ubuntu:~$ tail -50 cron_alc.log Cronjob started for back-up files + rsync -v umasarath@xx.xx.xx.xx:/tmp/compressed_logfiles/*.zip /home/umasarath/archive/ Permission denied, please try again. Permission denied, please try again. Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password). rsync: connection unexpectedly closed (0 bytes received so far) [Receiver] rsync error: unexplained error (code 255) at io.c(601) [Receiver=3.0.7] umasarath@ubuntu:~$ Please follow the below steps inorder to avoid the above error. My script contains the below code. umasarath@ubuntu:~$ cat transfer_files.sh #!/bin/sh set -xv echo "Cronjob started for back-up files" `date` /usr/bin/rsync -vv umasarath@xx.xx.xx.xx:/tmp/compressed_logfiles/*.zip /home/umasarath/archive/ echo "Cronjob ended for back-u
Read more

RSYNC command without authentication - 8 simple steps

Initially, when i try to sync the files from remotehost to localhost, i have to execute manually by executing in command prompt. I thought of executing the command by shell script and then call this script from cronjob. When i do this, the script was asking for authentication which is seems no difference between manual effort and an automated one. In order to avoid this, the following steps will explain how to perform RSYNC from localhost to remote host without entering password. umasarath@localhost:~$ rsync -v umasarath@remotehost:/home/umasarath/test/* test/ umasarath@remotehost's password: test11.txt umasarath.txt sent 61 bytes received 144 bytes 82.00 bytes/sec total size is 18 speedup is 0.09 umasarath@localhost:~$ Verify that localhost and remotehost is running openSSH umasarath@local:~$ ssh -V OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009 umasarath@remote:~$ ssh -V OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009 Generate key-pair on the lo
Read more

Install JDK on Ubuntu

Installing Open JDK from Command Prompt Issue command apt-get install openjdk-7-jdk to install JDK7. Ubuntu will auto download JDK and start the installation, wait a few minutes for the downloading process. umasarath @ ubuntu:~ $ sudo apt-get install openjdk- 7 -jdk Verifying Java after installation Ubuntu installs JDK at /usr/lib/jvm/jdk-folder, for example /usr/lib/jvm/java-7-openjdk-amd64/. In additional, Ubuntu also puts the JDK bin folder in the system path, via symbolic link.  For example, /usr/bin/java. To verify if JDK is installed properly, type java -version in the command prompt. umasarath@ubuntu:~$java-version java version "1.7.0_25" OpenJDK Runtime Environment (IcedTea 2.3.10) (7u25-2.3.10-1ubuntu0.12.04.2) OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode) umasarath@ubuntu:/usr/lib/jvm/java-7-openjdk-amd64/bin$ Post-Installation Setup To configure JAVA_HOME in system path each time the terminal is started, you can append the expor
Read more