[DrJava] [ drjava-Bugs-757409 ] Marine Biology Case Study problems

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Bugs item #757409, was opened at 2003-06-19 13:15
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Category: Interactions
Group: Serious
Status: Open
Resolution: None
Priority: 5
Submitted By: Dave Musicant (musicant)
Assigned to: Nobody/Anonymous (nobody)
Summary: Marine Biology Case Study problems

Initial Comment:
I am experiencing the following "show stopper" behavior
with the Advanced Placement Marine Biology Case Study,
with all recent versions of DrJava as well as the last
stable release, under JDK 1.4.1_03.

Here is my sample program:

class ExerciseSet1 {
  public static void main(String[] args) {
    BoundedEnv env = new BoundedEnv(20,20);
    
    Location loc1 = new Location(7,3);
    Location loc2 = new Location(7,4);
    Direction dir1 = env.getDirection(loc1,loc2);

  }
}

This code compiles just fine. When I try to run it in
the Interactions Pane by saying "java ExerciseSet1", I
get the error:

"Error: Undefined class 'ExerciseSet1'"

This error goes away if I comment out the last line of
my sample program, i.e. the one that runs the
getDirection method. The code also runs just fine if I
use different methods in the BoundedEnv class instead,
such as env.numCols(). The only difference that I can
see between these methods and getDirection is that the
getDirection method is not explicitly contained in the
BoundedEnv, but is instead inherited from the abstract
superclass SquareEnvironment.

I have my classpath in DrJava set up to include the two
jar files provided by the Marine Biology case study,
namely mbsgui.jar and mbsbb.jar. The code for
BoundedEnv is explictly provided, but SquareEnvironment
is provided as "black box" code and only its compiled
class file is provided in mbsbb.jar.

The above code runs just fine both from the command
line and within JCreator.

Could this be a problem with Dynamic Java?

The above code is a fragment of the very first program
that the students are asked to write within the case
study. 

I have included the zip file containing the Marine
Biology Case Study, which is also available for
download from the College Board.

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