Installing Doug Lea's concurrent Package (easy)

Question

Hi,
I'm having trouble getting Doug's package to work, probably because I didn't install correctly. I unzipped into the folder "C:\Java", which created "C:\Java\concurrent", containing all the files. I added this latter folder to my classpath and compiled, from the concurrent directory, using "javac *.java" which successfully created all the .class files. However, a simple test program which begins with the recommended import statement:
import EDU.oswego.cs.dl.util.concurrent.*;
refuses to compile, giving this error:
$ javac Test.java
Test.java:1: package EDU.oswego.cs.dl.util.concurrent does not exist
import EDU.oswego.cs.dl.util.concurrent.*;
^
Test.java:6: cannot access QueuedExecutor
bad class file: C:\Java\concurrent\QueuedExecutor.class
class file contains wrong class: EDU.oswego.cs.dl.util.concurrent.QueuedExecutor
Please remove or make sure it appears in the correct subdirectory of the classpa
th.
QueuedExecutor exec = new QueuedExecutor();
^
2 errors
Can anyone tell me what I'm doing wrong?
Thanks,
John

Answer 1

I created the directory structure and got my test class to compile. However, I'm now getting a NoClassDefFoundError at runtime at the line where I first create my QueuedExecutor. Test code follows. Thanks for any hints on how to fix it.
John
import EDU.oswego.cs.dl.util.concurrent.*;
public class Test {
     public static void main (String[] args) {
          QueuedExecutor myExec = new QueuedExecutor();
          try {
               myExec.execute(new MyRunnable("hello"));
          } catch (InterruptedException ignored) {}
          try {
               myExec.execute(new MyRunnable("hi"));
          } catch (InterruptedException ignored) {}
class MyRunnable implements Runnable {
     private String mMessage;
     public MyRunnable(String str) {
          mMessage = str;
     public void run() {
          for (int i=0; i<1000; i++) {
               System.out.println(mMessage);