executing jar file through cmd

Question

I have created a folder named "Thank" in c drive and in that folder, I have 2 java files namely T1 and myApp.

class T1 { void display() { System.out.println("Hey I am working"); } }

and

class myApp { public static void main(String args[]) { T1 t=new T1(); t.display(); } }

Now I created a jar file of this folder by:

 c:\>jar cf myApp.jar Thank

This creates a Jar file named myApp.

I even wrote Main-Class: myApp in the manifest.mf file.

When I try to run this by:

c:\>java -jar myApp.jar

I get an error -

An unexpected error occurred while trying to open file myApp.jar

Please tell me how to run jar file so that I get an output:

Hey I am working

What does your complete manifest file look like and where is it stored? — tbsalling
– tbsalling, Commented Jun 18, 2013 at 7:26
@tbsalling myApp.jar is stored in c drive. It further has 2 folders namely: META-INF & Thank. META-INF has a MANIFEST.MF file which contains: Main-Class: myApp; Manifest-Version: 1.0 Created-By: 1.7.0_21 (Oracle Corporation) — Neha Gupta
– Neha Gupta, Commented Jun 18, 2013 at 16:39
I have updated my answer below, showing how to make it work. — tbsalling
– tbsalling, Commented Jun 19, 2013 at 17:04

tbsalling · Accepted Answer · 2013-06-19 17:03:21Z

You should use jar cfm myApp.jar manifest.txt *.class to create the jar, so that the manifest file gets located correctly in the jar.

The right location of the manifest is META-INF/MANIFEST.MF.

Update

I have made your code work, basically by taking the files you had prepared; adding a package declaration to the java files and the manifest, and upper-casing the MyApp class from myApp. The files are arranged in this folder structure:

tbsmac:17162802-executing-java-file-through-cmd tbsalling$ ls -lR total 0 drwxr-xr-x 3 tbsalling staff 102 19 Jun 18:48 META-INF drwxr-xr-x 4 tbsalling staff 136 19 Jun 18:57 thank ./META-INF: total 8 -rw-r--r-- 1 tbsalling staff 46 19 Jun 18:49 MANIFEST.MF ./thank: total 16 -rw-r--r-- 1 tbsalling staff 124 19 Jun 18:49 MyApp.java -rw-r--r-- 1 tbsalling staff 98 19 Jun 18:48 T1.java

The contents of the three files are:

MyApp.java:

package thank; class MyApp { public static void main(String args[]) { T1 t=new T1(); t.display(); } }

T1.java:

package thank; class T1 { void display() { System.out.println("Hey I am working"); } }

MANIFEST.MF:

Main-Class: thank.MyApp Manifest-Version: 1.0

Then I run this series of commands:

tbsmac:17162802-executing-java-file-through-cmd tbsalling$ javac thank/T1.java thank/MyApp.java tbsmac:17162802-executing-java-file-through-cmd tbsalling$ jar cfm myApp.jar META-INF/MANIFEST.MF thank/*.class tbsmac:17162802-executing-java-file-through-cmd tbsalling$ java -jar myApp.jar Hey I am working

^^^ and it works ;-)

The Badak · Accepted Answer · 2013-06-18 07:21:10Z

0

try by typing: java.exe -jar "(full path to jar)"

example: java.exe -jar "C:\TestFolder\Project Java\myApp.jar"

answered Jun 18, 2013 at 7:21

The Badak

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1 Comment

Neha Gupta Over a year ago

It again says that an unexpected error occurs while opening c:\myApp.jar

Juned Ahsan · Accepted Answer · 2013-06-18 07:23:58Z

Couple of things:

Make sure you add the complete class name along with package names in manifest file.
Also make sure to add a newline at the end of your jar manifest file. If not do so.

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