Program: 106209
Project: 106209
Buggy source:
private void deleteGuestNetworkRouters(Network network){
  long accountID=network.getAccountId();
  boolean isVpc=getIsVpc(network);
  long id=getRouterId(network,isVpc);
  Router tenantRouter=getGuestNetworkRouter(id,accountID,isVpc);
  for (  Port peerPort : tenantRouter.getPeerPorts((new MultivaluedMapImpl()))) {
    if (peerPort != null && peerPort instanceof RouterPort) {
      RouterPort checkPort=(RouterPort)peerPort;
      if (checkPort.getType().equals("String_Node_Str")) {
        checkPort.vifId(null).update();
      }
 else       if (checkPort.getType().equals("String_Node_Str")) {
        checkPort.unlink();
      }
      checkPort.delete();
    }
 else     if (peerPort != null && peerPort instanceof BridgePort) {
      BridgePort checkPort=(BridgePort)peerPort;
      if (checkPort.getType().equals("String_Node_Str")) {
        checkPort.vifId(null).update();
      }
 else       if (checkPort.getType().equals("String_Node_Str")) {
        checkPort.unlink();
      }
      checkPort.delete();
    }
  }
  if (tenantRouter != null) {
    for (    RouterPort p : tenantRouter.getPorts(new MultivaluedMapImpl())) {
      if (p.getType().equals("String_Node_Str")) {
        p.vifId(null).update();
      }
      if (p.getType().equals("String_Node_Str")) {
        p.unlink();
      }
      p.delete();
    }
    String accountIdStr=String.valueOf(accountID);
    String routerName=getRouterName(isVpc,id);
    RuleChain pre=api.getChain(tenantRouter.getInboundFilterId());
    RuleChain preFilter=getChain(accountIdStr,routerName,RuleChainCode.TR_PREFILTER);
    RuleChain preNat=getChain(accountIdStr,routerName,RuleChainCode.TR_PRENAT);
    RuleChain post=api.getChain(tenantRouter.getOutboundFilterId());
    pre.delete();
    preFilter.delete();
    preNat.delete();
    post.delete();
    for (    Route r : tenantRouter.getRoutes(new MultivaluedMapImpl())) {
      r.delete();
    }
    tenantRouter.delete();
  }
}

Fixed version (ground truth):
private void deleteGuestNetworkRouters(Network network){
  String accountUuid=getAccountUuid(network);
  boolean isVpc=getIsVpc(network);
  long id=getRouterId(network,isVpc);
  Router tenantRouter=getGuestNetworkRouter(id,accountUuid,isVpc);
  for (  Port peerPort : tenantRouter.getPeerPorts((new MultivaluedMapImpl()))) {
    if (peerPort != null && peerPort instanceof RouterPort) {
      RouterPort checkPort=(RouterPort)peerPort;
      if (checkPort.getType().equals("String_Node_Str")) {
        checkPort.vifId(null).update();
      }
 else       if (checkPort.getType().equals("String_Node_Str")) {
        checkPort.unlink();
      }
      checkPort.delete();
    }
 else     if (peerPort != null && peerPort instanceof BridgePort) {
      BridgePort checkPort=(BridgePort)peerPort;
      if (checkPort.getType().equals("String_Node_Str")) {
        checkPort.vifId(null).update();
      }
 else       if (checkPort.getType().equals("String_Node_Str")) {
        checkPort.unlink();
      }
      checkPort.delete();
    }
  }
  if (tenantRouter != null) {
    for (    RouterPort p : tenantRouter.getPorts(new MultivaluedMapImpl())) {
      if (p.getType().equals("String_Node_Str")) {
        p.vifId(null).update();
      }
      if (p.getType().equals("String_Node_Str")) {
        p.unlink();
      }
      p.delete();
    }
    String accountIdStr=String.valueOf(accountUuid);
    String routerName=getRouterName(isVpc,id);
    RuleChain pre=api.getChain(tenantRouter.getInboundFilterId());
    RuleChain preFilter=getChain(accountIdStr,routerName,RuleChainCode.TR_PREFILTER);
    RuleChain preNat=getChain(accountIdStr,routerName,RuleChainCode.TR_PRENAT);
    RuleChain post=api.getChain(tenantRouter.getOutboundFilterId());
    pre.delete();
    preFilter.delete();
    preNat.delete();
    post.delete();
    for (    Route r : tenantRouter.getRoutes(new MultivaluedMapImpl())) {
      r.delete();
    }
    tenantRouter.delete();
  }
}