Getting a NullPointerException after update to latest version (2021-04-08_04-19-29.d3a4c39))

[Kim Lindberg]

Hope someone can help me. I updated to the latest OpenPnP version on a working setup, but now I get a NullPointerException when trying to pick a part from a feeder.

I cannot seem to find out why :(

[tony...@att.net]

Can you post your machine.xml?

[tony...@att.net]

By any chance do you have a part assigned to any feeder that doesn't exist in your parts.xml file? 

I suspect the highlighted code is returning a null pointer in that case:

            // add property listener for recycle button

            // enable recycle only if part on current head

            PropertyChangeListener recyclePropertyListener = (e) -> {

                    boolean canTakeBack = false;

                    Part part = machineControlsPanel.getSelectedNozzle().getPart();

                    if (part != null) {

                        for (Feeder feeder : Configuration.get().getMachine().getFeeders()) {

                            if (feeder.isEnabled() && feeder.getPart().equals(part) && feeder.canTakeBackPart()) {

                                canTakeBack = true;

                            }

                        }

                    }

                    recycleAction.setEnabled(canTakeBack);

                };

A quick workaround, if that is the case, is to disable any feeders that may be assigned non-existent parts.

[Kim Lindberg]

Hi Tony,
Thanks for the input. It turns out that all the StripFeeders where enabled, but no parts where assigned. Thank a lot that did the trick.

I guess this is new, because I never used the strip feeders, hence I never enabled them!

I attached my Machine.xml (after I turned off the strip feeders)

[ma...@makr.zone]

Hi

FYI, it comes from

https://github.com/openpnp/openpnp/pull/1143

I fixed that in here

https://github.com/openpnp/openpnp/pull/1169

_Mark

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