Running Java Program from Command-line

Question

I downloaded a java program that consists of two folders src and classes containing the source files and class files respectively. Now, the src and classes folders contain a several nested sub-folders wherein the last sub-folder contains the source and class files respectively. More precisely, the path to a source and class file is src/edu/univ/.java and classes/edu/univ/.class. Given that the file containing the main function is Main.java, how can I run this program from command-line.

I have tried:

 java  src/edu/univ/Main but I get Exception in thread "main" java.lang.NoClassDefFoundError: src/edu/univ/Main

I have also tried: java src.edu.univ.Main but I encounter a similar error

try java edu.univ.Main you have to use the fully qualified name of the class. — reto
– reto, Commented Nov 21, 2013 at 21:42
The src folder contains the Java source files. The executable clases are in classes/edu/... — Jim Garrison
– Jim Garrison, Commented Nov 21, 2013 at 21:44

Dave Newton · Accepted Answer · 2013-11-21 21:44:44Z

6

From the root of the project:

java -cp classes edu.univ.Main

This tells the JRE that the classes directory is the root of your package hierarchy. The JRE will load packages from there, following the directory/package naming hierarchy.

answered Nov 21, 2013 at 21:44

Dave Newton

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2 Comments

Amir Afghani Over a year ago

clean this up for colon seperated paths

Dave Newton Over a year ago

@AmirAfghani Irrelevant for the OP at this time.

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