What is the cause of the error from the overhead crane component?
04:14 05 Jan 2026

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I dynamically generated crane markup in code and used the MoveByCrane block to control crane selection, with a custom priority logic for crane assignment.

double scaleUnit = scale.pixelsPerUnit(METER);
List cranes = new ArrayList();

this.models.addAll(devices);

// 天车安全间隔
final double safetyGap = 1.5d;

for (DeviceModel device: devices) {
    if (device.getType()!=DeviceModel.Type.OVERHEAD_CRANE) {
        continue;
    }
    if (!device.getEnable()) continue;
    device.setRotationCenter(DeviceModel.RotationCenter.TOP_LEFT);
    var pos = device.getPosition();
    List bridgeDevices = devices.stream().filter(e->e.getType()==DeviceModel.Type.CRANE_BRIDGE && e.getParentId().equals(device.getId())).collect(Collectors.toList());
    if (bridgeDevices.isEmpty()) Logger.error("The bridge of the overhead crane("+device.getId()+") is empty, please check the configuration");
    // 桥
    List bridges = new ArrayList();
    List bridgeOffsets = new ArrayList();
    for (DeviceModel bridgeDevice: bridgeDevices) {
        // 桥的位置、车的位置、桥的颜色
        double bridgeLocation = device.getPosition().distance(bridgeDevice.getPosition());
        bridgeOffsets.add(bridgeLocation);
        OverheadCraneBridge bridge = new OverheadCraneBridge(bridgeLocation, device.getWidth()/2, goldenRod);
        bridges.add(bridge);
        
        bridgeStatusListMap.put(bridge, new ArrayList());
        craneModelMap.put(bridge, bridgeDevice);
        idCraneMap.put(bridgeDevice.getId(), bridge);
    }
    // 天车
    OverheadCraneDescriptor descriptor = buildCraneDescriptor(device);
    OverheadCrane crane = new OverheadCrane(this, SHAPE_DRAW_2D3D, true, true, descriptor,
        pos.getX()*scaleUnit, pos.getY()*scaleUnit, pos.getZ()*scaleUnit, pos.getYaw()*PI/180,
        // 轨道长度,吊车宽度，吊车高度
        device.getLength(), device.getWidth(), device.getHeight(), 
        // 桥架宽度，桥架安全间隙
        2, safetyGap,
        // 轨道颜色，车颜色
        lightSlateGray, gray,
        // OVERHEAD_CRANE_GANTRY, OVERHEAD_CRANE_GIRDER_DOUBLE_TIE,
        OVERHEAD_CRANE_BRIDGE, OVERHEAD_CRANE_GIRDER_DOUBLE_TIE,
        bridges.toArray(OverheadCraneBridge[]::new)
    );
    // OVERHEAD_CRANE_MOVEMENT_STEP_BY_STEP，OVERHEAD_CRANE_MOVEMENT_CONCURRENT， OVERHEAD_CRANE_MOVEMENT_INDEPENDENT_HOIST
    crane.setMovementMode(OVERHEAD_CRANE_MOVEMENT_INDEPENDENT_HOIST); 
    crane.setAccelerationEnabled(descriptor._accelerationEnabled_DefaultValue_xjal());
    
    // 检查安全距离
    bridgeOffsets.sort(Comparator.naturalOrder());
    double lastOffset = bridgeOffsets.get(0);
    for (int i=1; i

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When the number of crane tasks increases, an error "No feasible target for bridge" occurs during the "On seize crane" action of the MoveByCrane block. I haven’t found any logical issues in my implementation.

Could you please advise how to diagnose the root cause of this error?

Additionally,

  1. the same error still occurs even when I do not customize the crane selection priority!
  2. the error still occurs regardless of whether I set the crane selection to return type OverheadCrane or OverheadCraneBridge!
anylogic