Program: 75709
Project: 75709
Buggy source:
public DatagramWriter(CompositeEntity container,String name) throws NameDuplicationException, IllegalActionException {
  super(container,name);
  remoteAddress=new TypedIOPort(this,"String_Node_Str");
  remoteAddress.setInput(true);
  remoteAddress.setMultiport(true);
  remoteAddress.setTypeEquals(BaseType.STRING);
  remoteSocketNumber=new TypedIOPort(this,"String_Node_Str");
  remoteSocketNumber.setInput(true);
  remoteSocketNumber.setMultiport(true);
  remoteSocketNumber.setTypeEquals(BaseType.INT);
  data=new TypedIOPort(this,"String_Node_Str");
  data.setInput(true);
  data.setTypeEquals(BaseType.GENERAL);
  defaultRemoteAddress=new StringAttribute(this,"String_Node_Str");
  defaultRemoteAddress.setExpression("String_Node_Str");
  defaultRemoteSocketNumber=new Parameter(this,"String_Node_Str");
  defaultRemoteSocketNumber.setTypeEquals(BaseType.INT);
  defaultRemoteSocketNumber.setExpression("String_Node_Str");
  localSocketNumber=new Parameter(this,"String_Node_Str");
  localSocketNumber.setTypeEquals(BaseType.INT);
  localSocketNumber.setToken(new IntToken(4003));
  encoding=new StringAttribute(this,"String_Node_Str");
  encoding.setExpression("String_Node_Str");
  triggerOutput=new TypedIOPort(this,"String_Node_Str");
  triggerOutput.setTypeEquals(BaseType.GENERAL);
  triggerOutput.setOutput(true);
}

Fixed version (ground truth):
/** 
 * Construct a DatagramWriter actor with given name in the given container.  Set up ports, parameters and default values.  Two of the parameters are used in a funny way.  They give default values for the  <i>remoteAddress</i> and <i>remoteSocketNumber</i> ports in case no tokens are available there.
 * @param container The container.
 * @param name The name for this actor.
 * @exception NameDuplicationException If the container already has anactor with this name.
 * @exception IllegalActionException If the actor cannot be contained bythis container
 */
public DatagramWriter(CompositeEntity container,String name) throws NameDuplicationException, IllegalActionException {
  super(container,name);
  remoteAddress=new TypedIOPort(this,"String_Node_Str");
  remoteAddress.setInput(true);
  remoteAddress.setMultiport(true);
  remoteAddress.setTypeEquals(BaseType.STRING);
  remoteSocketNumber=new TypedIOPort(this,"String_Node_Str");
  remoteSocketNumber.setInput(true);
  remoteSocketNumber.setMultiport(true);
  remoteSocketNumber.setTypeEquals(BaseType.INT);
  data=new TypedIOPort(this,"String_Node_Str");
  data.setInput(true);
  data.setTypeEquals(BaseType.GENERAL);
  defaultRemoteAddress=new StringAttribute(this,"String_Node_Str");
  defaultRemoteAddress.setExpression("String_Node_Str");
  defaultRemoteSocketNumber=new Parameter(this,"String_Node_Str");
  defaultRemoteSocketNumber.setTypeEquals(BaseType.INT);
  defaultRemoteSocketNumber.setExpression("String_Node_Str");
  localSocketNumber=new Parameter(this,"String_Node_Str");
  localSocketNumber.setTypeEquals(BaseType.INT);
  localSocketNumber.setToken(new IntToken(4003));
  encoding=new StringAttribute(this,"String_Node_Str");
  encoding.setExpression("String_Node_Str");
  triggerOutput=new TypedIOPort(this,"String_Node_Str");
  triggerOutput.setTypeEquals(BaseType.GENERAL);
  triggerOutput.setOutput(true);
}