CODEWITHSUNDEEP
javabashscriptingcygwin
Swoogan
Swoogan

Reputation: 5558

How do I run a java program from a different directory?

I have a java program that I would like to be able to run from anywhere on my machine. I would like to run it from my Cygwin command prompt. I've made scripts to call the java program. I added the location of the java program to the classpath, and the scripts work when I run them from the java program's directory. However, when I try to run from any other directory, I get:

java.lang.NoClassDefFoundError: commandprogram/CommandProgram

This is my script:

#!/bin/sh
CWD=`dirname "$0"`
java -cp "$CWD/classes;$CWD/lib/AJarFile.jar" commandprogram/CommandProgram

Changing the java line to the following:

java -cp "$CWD/classes;$CWD/classes/commandprogram;$CWD/lib/AJarFile.jar" CommandProgram

produces the same results.

Upvotes: 23

Views: 53359

Answers (4)

Kaushik
Kaushik

Reputation: 1

The usual way of running a java file is to save it in the Java/Bin folder and Run cmd

C:\Program Files\Java\jdk1.7.0_05\bin> javac filename.java && java classname

If you save the file in different directory such as D:, you can use the following on the cmd prompt:

D:\Project java> set path=%path%;C:Program Files\Java\jdk1.7.0_05\bin

Upvotes: -10

Swoogan
Swoogan

Reputation: 5558

After trying just about everything I could think of, I echoed out the command and saw that there was mixing of Cygwin paths and Windows paths. The solution was to change the script to:

#!/bin/sh
CWD=`dirname "$0"`
CWD=`cygpath -w "$CWD"`
java -cp "$CWD/classes;$CWD/lib/AJarFile.jar" commandprogram/CommandProgram

Then CWD changed to "C:\Program Files\..." instead of "/cygdrive/c/Program\ Files/..."

I had previously encountered this problem and solved it with the cygpath -w solution, but then changed my script slightly and didn't notice that the path problem came back.

Upvotes: 4

cd1
cd1

Reputation: 16534

you have to use a dot to separate packages, not a slash.

java -cp "$CWD/classes;$CWD/lib/AJarFile.jar" commandprogram.CommandProgram

Upvotes: 1

woakas
woakas

Reputation: 5646

add your directory to classpath example:

java -classpath commandprogram CommandProgram

or 

java -classpath directory_to_program Program

Upvotes: 32

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