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)

Answer 1

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;