Java – import javax.comm*; error

Have you tried RXTX? I've had successf with that API on Windows/XP. I'n not sure what you mean by "starting to beat me".

There has been a lot of recent activity on the RXTX project and a new release incorporating a number of fixes and additional support is imminent. The mailing list is also relatively active. javax.comm has been more or less dead for a while.

Let's say we need to use the class Classname that is contained in the jar file org.example.jar

And your source is in the file mysource.java Like this:

import org.example.Classname;

public class mysource {
    public static void main(String[] argv) {
    ......
   }
}

First, as you see, in your code you have to import the classes. To do that you need import org.example.Classname;

Second, when you compile the source, you have to reference the jar file.

Please note the difference in using : and ; while compiling

• If you are under a unix like operating system:

  javac -cp '.:org.example.jar' mysource.java
  

• If you are under windows:

  javac -cp .;org.example.jar mysource.java
  

After this, you obtain the bytecode file mysource.class

Now you can run this :

• If you are under a unix like operating system:

  java -cp '.:org.example.jar' mysource
  

• If you are under windows:

  java -cp .;org.example.jar mysource