执行Java程序而不设置类路径

Question

I have a program that resides in a directory that is not set in the path/classpath - and I want to execute it using the -cp option on my console. But I get the NoClassDefFoundException , regardless of what I set as -cp

- out
 `- de
  `- my
   `- package
    `- MainClass.class

I navigate into the package directory and try to execute the main class using

MyBook-Pro:out flopes$ java -cp . de.my.package.MainClass

What am I doing wrong here?

Answer 1

The classpath must contain

• jar files
• directories containing the roots of the package tree.

If your package is de.my.package , the root is de , and the directory containing de must be in the classpath.

So, if you're in the package directory, the classpath should be set to ../../.. : the out directory is the one that should be in the classpath.

Or you should use . as the classpath, but launch your program from the out directory.