JNA example program java.lang.NoClassDefFoundError

Question

I can compile this JNA example code (from step 2 of https://github.com/twall/jna/#getting_started):

package com.sun.jna.examples;

import com.sun.jna.Library         


        

Answer 1

This example (as well as vast majority of java classes) uses packages:

package com.sun.jna.examples;

In order to compile / run it properly you need to run javac / java from the "root" folder (e.g. folder where "com" is located):

Let's say you have a folder called examples. You'd put both the jna.jar and the source code in it preserving folder structure:

/examples
 jna.jar
 /com
   /sun
      /jna
         /examples
           HelloWorld.java

You compile and run using:

javac -classpath .:jna.jar -g com/sun/jna/examples/HelloWorld.java

java -classpath .:jna.jar com.sun.jna.examples.HelloWorld

Note the path separators in the former case and dots in the latter.