Question

I have a Timer class and a Test class to test this timer:

package tools;

public class Timer extends Thread 
{
    public boolean isRunning = true;
    private long timeout = 0;

    public Timer(long aTimeout)
    {
        timeout = aTimeout;
    }

    // Run the Thread
    public void run()
    {
        int i = 1000;
        while(i <= timeout)
        {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            i = i + 1000;
        }
        isRunning = false;
    }
}

And the Test Class:

public class Test 
{
    public static void main(String[] args) 
    {
        Timer myTimer = new Timer(10000);
        myTimer.start();

        while(myTimer.isRunning)
        {
            System.out.println("Running");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

In Eclipse this works well. When I include it to another project on a Solaris Server, I get the following exception:

Exception in thread "main" java.lang.NoSuchMethodError: tools.Timer.<init>(J)V 

I googled it but I could not find any answer – why is this not working ? Cheers, Tim.

Answer 1

You’re constructing timer like this:

Timer myTimer = new Timer();

And your constructor declaration is:

public Timer(long aTimeout)

Obvious, isn’t it? You must either construct the timer like new Timer(1234), or add a parameterless constructor to it.