Program: 186323
Project: 186323
Buggy source:
@Override public void perform(){
  VectorXYZ[] points=new VectorXYZ[4];
  DelaunayTriangle[] neighbors=new DelaunayTriangle[4];
  points[0]=originalTriangles[0].getPoint(1);
  neighbors[0]=originalTriangles[0].getNeighbor(1);
  points[1]=originalTriangles[0].getPoint(2);
  neighbors[1]=originalTriangles[0].getNeighbor(2);
  int i=originalTriangles[1].indexOfNeighbor(originalTriangles[0]);
  points[2]=originalTriangles[1].getPoint((i + 1) % 3);
  neighbors[2]=originalTriangles[1].getNeighbor((i + 1) % 3);
  points[3]=originalTriangles[1].getPoint((i + 2) % 3);
  neighbors[3]=originalTriangles[1].getNeighbor((i + 2) % 3);
  createdTriangles=new DelaunayTriangle[2];
  createdTriangles[0]=new DelaunayTriangle(points[1],points[2],points[3]);
  createdTriangles[1]=new DelaunayTriangle(points[3],points[0],points[1]);
  createdTriangles[0].setNeighbor(0,neighbors[1]);
  createdTriangles[0].setNeighbor(1,neighbors[2]);
  createdTriangles[0].setNeighbor(2,createdTriangles[1]);
  createdTriangles[1].setNeighbor(0,neighbors[3]);
  createdTriangles[1].setNeighbor(1,neighbors[0]);
  createdTriangles[1].setNeighbor(2,createdTriangles[0]);
  if (neighbors[0] != null)   neighbors[0].replaceNeighbor(originalTriangles[0],createdTriangles[1]);
  if (neighbors[1] != null)   neighbors[1].replaceNeighbor(originalTriangles[0],createdTriangles[0]);
  if (neighbors[2] != null)   neighbors[2].replaceNeighbor(originalTriangles[1],createdTriangles[0]);
  if (neighbors[3] != null)   neighbors[3].replaceNeighbor(originalTriangles[1],createdTriangles[1]);
  triangles.remove(originalTriangles[0]);
  triangles.remove(originalTriangles[1]);
  triangles.add(createdTriangles[0]);
  triangles.add(createdTriangles[1]);
}

Fixed version (ground truth):
@Override public void perform(){
  VectorXYZ[] points=new VectorXYZ[4];
  DelaunayTriangle[] neighbors=new DelaunayTriangle[4];
  points[0]=originalTriangles[0].getPoint(1);
  neighbors[0]=originalTriangles[0].getNeighbor(1);
  points[1]=originalTriangles[0].getPoint(2);
  neighbors[1]=originalTriangles[0].getNeighbor(2);
  int i=originalTriangles[1].indexOfNeighbor(originalTriangles[0]);
  points[2]=originalTriangles[1].getPoint((i + 1) % 3);
  neighbors[2]=originalTriangles[1].getNeighbor((i + 1) % 3);
  points[3]=originalTriangles[1].getPoint((i + 2) % 3);
  neighbors[3]=originalTriangles[1].getNeighbor((i + 2) % 3);
  createdTriangles=new DelaunayTriangle[2];
  createdTriangles[0]=new DelaunayTriangle(points[2],points[3],points[1]);
  createdTriangles[1]=new DelaunayTriangle(points[3],points[0],points[1]);
  createdTriangles[0].setNeighbor(0,neighbors[2]);
  createdTriangles[0].setNeighbor(1,createdTriangles[1]);
  createdTriangles[0].setNeighbor(2,neighbors[1]);
  createdTriangles[1].setNeighbor(0,neighbors[3]);
  createdTriangles[1].setNeighbor(1,neighbors[0]);
  createdTriangles[1].setNeighbor(2,createdTriangles[0]);
  if (neighbors[0] != null)   neighbors[0].replaceNeighbor(originalTriangles[0],createdTriangles[1]);
  if (neighbors[1] != null)   neighbors[1].replaceNeighbor(originalTriangles[0],createdTriangles[0]);
  if (neighbors[2] != null)   neighbors[2].replaceNeighbor(originalTriangles[1],createdTriangles[0]);
  if (neighbors[3] != null)   neighbors[3].replaceNeighbor(originalTriangles[1],createdTriangles[1]);
  triangles.remove(originalTriangles[0]);
  triangles.remove(originalTriangles[1]);
  triangles.add(createdTriangles[0]);
  triangles.add(createdTriangles[1]);
}