Why doesn't this code work in Netbeans 7.0?

[Michael Kenning]

When I run the following code which I got from Head First Java (it uses Java 5.0, by the way), I get the following error:
run:
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: Accum.getAccum
at ThreadOne.<init>(TestThreads.java:27)
at TestThreads.main(TestThreads.java:18)
Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)

Here is the code:

@interface ClassInfo{
    
   String created();
   String createdBy();
   String lastModified();
   String lastModifiedBy();
   int revision();
   
}

@ClassInfo(
        
        created = "Head First Java, pp. 524-525, 2006", // line 18
        createdBy = "Kathy Sierra & Bart Bates",
        lastModified = "5/26/2011",
        lastModifiedBy = "Michael Kenning",
        revision = 5
        
        )

public class TestThreads {
// line 27     
  public static void main(String [] args){
     
    ThreadOne t1 = new ThreadOne();
    ThreadTwo t2 = new ThreadTwo();
    Thread one = new Thread(t1);
    Thread two = new Thread(t2);
    one.start();
    two.start();
    }

 }  // close outer class

class Accum {
    private static Accum a = new Accum();
        private int counter = 0;
        private Accum(){}
        
        public static Accum getAccum(){
            return a;
        }
        
        public void updateCounter(int add){
        counter += add;    
        }
        
        public int getCount(){
        return counter;
        }
        
} // close class Accum

class ThreadOne implements Runnable{
       Accum a = Accum.getAccum();
     
       
       public void run(){
        
            for (int x = 0; x< 98; x++){
                a.updateCounter(1000);
            try{
                Thread.sleep(50);
            }(catch InterruptedException ex){}
        } 
     
        System.out.println("one " + a.getCount());
    } // close Runnable
} // close ThreadOne


class ThreadTwo implements Runnable {
       Accum a = Accum.getAccum();
    public void run(){
        for (int x = 0; x< 99; x++){
                a.updateCounter(1);
            try{
                Thread.sleep(50);
            }(catch InterruptedException ex){}
        } 
     
        System.out.println("two " + a.getCount());
    } // close Runnable
} // close ThreadTwo

Can anybody help me with this problem? I have marked the problem lines, by the way.

[Andrey Kozhanov]

Errors are at lines 64 and 79. They both are

}(catch InterruptedException ex) {}

, but should be

} catch (InterruptedException ex) {}

[Michael Kenning]

Andrey Kozhanov wrote:Errors are at lines 64 and 79. They both are

}(catch InterruptedException ex) {}

, but should be

} catch (InterruptedException ex) {}

Thanks! That helped a lot! But now I am getting the following error:

run:
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: Accum.getAccum
at ThreadOne.<init>(TestThreads.java:27)
at TestThreads.main(TestThreads.java:18)
Java Result: 1
BUILD SUCCESSFUL (total time: 1 second)

What does "Erroneous sym type" mean?

[Rob Spoor]

No idea. After fixing those two catch errors the code compiles just fine on my system (Windows 7, JDK 1.6.0_25). The results are random though, but that makes sense since there is no synchronization on the updating of the counter.

[agilemanoj kumar]

No exceptions/errors found. I tried on windows xp with jdk 1.6