Program: 7277
Project: 7277
Buggy source:
public boolean collide(GameEntity ge){
  ge.grounded=false;
  Node[] nodes=new Node[5];
  ArrayList<Node> collnodes=new ArrayList<Node>();
  nodes[0]=getLeaf(ge.boundingBox.getX(),ge.boundingBox.getY());
  nodes[1]=getLeaf(ge.boundingBox.getX() + ge.boundingBox.getWidth(),ge.boundingBox.getY());
  nodes[2]=getLeaf(ge.boundingBox.getX(),ge.boundingBox.getY() + ge.boundingBox.getHeight());
  nodes[3]=getLeaf(ge.boundingBox.getX() + ge.boundingBox.getWidth(),ge.boundingBox.getY() + ge.boundingBox.getHeight());
  boolean collision=false;
  float points[]=ge.boundingBox.getPoints();
  forwards[0]=new Polygon();
  forwards[0].addPoint(points[0],points[1]);
  forwards[0].addPoint(points[2],points[3]);
  forwards[0].addPoint(points[2] + ge.velocity.getX(),points[3] + ge.velocity.getY());
  forwards[0].addPoint(points[0] + ge.velocity.getX(),points[1] + ge.velocity.getY());
  forwards[0].setClosed(true);
  forwards[1]=new Polygon();
  forwards[1].addPoint(points[2],points[3]);
  forwards[1].addPoint(points[4],points[5]);
  forwards[1].addPoint(points[4] + ge.velocity.getX(),points[5] + ge.velocity.getY());
  forwards[1].addPoint(points[2] + ge.velocity.getX(),points[3] + ge.velocity.getY());
  forwards[1].setClosed(true);
  forwards[2]=new Polygon();
  forwards[2].addPoint(points[4],points[5]);
  forwards[2].addPoint(points[6],points[7]);
  forwards[2].addPoint(points[6] + ge.velocity.getX(),points[7] + ge.velocity.getY());
  forwards[2].addPoint(points[4] + ge.velocity.getX(),points[5] + ge.velocity.getY());
  forwards[2].setClosed(true);
  forwards[3]=new Polygon();
  forwards[3].addPoint(points[6],points[7]);
  forwards[3].addPoint(points[0],points[1]);
  forwards[3].addPoint(points[6] + ge.velocity.getX(),points[7] + ge.velocity.getY());
  forwards[3].addPoint(points[0] + ge.velocity.getX(),points[1] + ge.velocity.getY());
  forwards[3].setClosed(true);
  for (  Polygon forward : forwards) {
    for (    Node n : nodes) {
      if (n != null && n.filled && (forward.contains(n.rect) || forward.intersects(n.rect) || n.rect.contains(forward)) && !collnodes.contains(n)) {
        collnodes.add(n);
      }
    }
  }
  Vector2f target=null;
  for (  Node n : collnodes) {
    if (Math.abs(n.rect.getCenterX() - ge.boundingBox.getCenterX()) >= Math.abs(n.rect.getCenterY() - ge.boundingBox.getCenterY())) {
      if (ge.velocity.getX() > 0 && ge.position.getX() != n.rect.getMaxX()) {
        target=new Vector2f(n.rect.getX() - ge.boundingBox.getWidth(),ge.position.getY());
      }
 else       if (ge.velocity.getX() < 0) {
        target=new Vector2f(n.rect.getMaxX(),ge.position.getY());
      }
      ge.velocity.set(0,ge.velocity.getY());
      System.out.println("String_Node_Str");
    }
 else {
      if (ge.velocity.getY() < 0) {
        target=new Vector2f(ge.position.getX(),n.rect.getMaxY());
        ge.velocity.add(new Vector2f(ge.velocity.getX(),Main.GRAVITY.getY()));
      }
 else       if (ge.velocity.getY() > 0 && ge.position.getY() != n.rect.getMaxY()) {
        target=new Vector2f(ge.position.getX(),n.rect.getY() - ge.boundingBox.getHeight());
        ge.grounded=true;
        ge.velocity.set(ge.velocity.getX(),0);
        System.out.println("String_Node_Str");
      }
    }
  }
  if (target != null) {
    ge.position.set(target);
    ge.boundingBox.setLocation(ge.position);
  }
  if (collnodes.size() > 0) {
    System.out.println("String_Node_Str");
    return true;
  }
  return false;
}

Fixed version (ground truth):
public boolean collide(GameEntity ge){
}