[GROOVY-4056] Scope problem with anonymous classes

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Compiler
• Environment: Ubuntu Karmic , OpenJDK , Groovy Trunk 2010-02-14 11:28+00:00
• Assignee: Unassigned
• Reporter: Dr. Russel Winder
• Created: 14/Feb/10 05:29
• Updated: 25/Nov/13 07:12

Description

In the code fragment:

  for ( int i = 0 ; i < numberOfTasks ; ++i ) {
    final int taskId = i
    processes[taskId] = new CSProcess ( ) {
      public void run ( ) {
        double sum = 0.0 ;
        final long start = 1 + taskId * sliceSize
        final long end = ( taskId + 1 ) * sliceSize
        for ( long j = start ; j <= end ; ++j ) {
          final double x = ( j - 0.5d ) * delta
          sum += 1.0d / ( 1.0d + x * x )
        }
        channels[taskId].out ( ).write ( sum )
      }
    }
  }

The outer loop uses i and in Java the loop in the run method uses i as well since there is no scope conflict. In Groovy, as noted above you cannot use i in the run method of the anonymous class as it is reported as a scoping violation.