Compiling / running Java from one folder up

Question

I have the following directory structure:

folder1/
    folder2/
        compiler.java

For a school assignment, we have to be able to run the following commands from folder1:

javac folder2/compiler.java
java  folder2/compiler

The compilation with javac works. When I try to run it with the above java command, I get a

Exception in thread "main" java.lang.NoClassDefFoundError: folder2/compiler (wrong name: compiler)

javac should be emiting the .class files to the same folder (unless yours is configured differently). You should be able to just java compiler in the same directory that the compiler.class file is in. — Visionary Software Solutions
– Visionary Software Solutions, Commented Jan 29, 2012 at 21:15
Are you sure you are not running java folder2.compiler.java instead of java folder2.compiler? — Piotr Praszmo
– Piotr Praszmo, Commented Jan 29, 2012 at 21:20
Banthar: I was running java folder2/compiler.java. When I run java folder2/compiler, I still get an error message (see edited error in question) — user1022241
– user1022241, Commented Jan 29, 2012 at 21:23

ThinkingStiff · Accepted Answer · 2012-01-29 21:36:16Z

2

You have two options.

If your class compiler is in the default package do this. (No package declaration)

javac folder2/compiler.java
java -cp folder2/ compiler

Otherwise, if your class compiler is in the package folder2 then do this.

javac folder2/compiler.java
java -cp . folder2.compiler

You can put complier in the folder2 package by putting a package declaration at the top of compiler.java

package folder2;

edited Jan 29, 2012 at 21:36

ThinkingStiff

65.4k31 gold badges148 silver badges241 bronze badges

answered Jan 29, 2012 at 21:25

Dev

12.3k3 gold badges45 silver badges56 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

user1022241 Over a year ago

Is there no way to be able to run javac folder2/compiler.java then java folder2/compiler? I have to get those to commands working exactly for a grading script...

Dev Over a year ago

@gonzoc0ding You may omit the -cp argument if you set the CLASSPATH in the environment. So using my first example, after the javac you can do export CLASSPATH="folder2/" then java compiler. This is assuming a unix-like sh or bash is what you are working from.

Aditya Naidu · Accepted Answer · 2012-01-29 21:25:37Z

0

Try

java -cp . folder2.compiler

make sure class compiler is in the folder2 package

answered Jan 29, 2012 at 21:25

Aditya Naidu

1,3709 silver badges12 bronze badges

Collectives™ on Stack Overflow

Compiling / running Java from one folder up

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related