Perspective - Unexpected problem unregistering listener from session event bus

Ignition
1

Hi all,

I'm getting the below error in my gateway logs referring to an expression binding on a Perspective label component. It seems to populate the error anytime I have the page active. Wondering if anyone has seen this before? The expression binding on props.text is:

{view.params.Label} + ": " + {view.params.Value} + " " + {view.params.Units}

I'm currently running 8.1 RC2 so it's possible it is related to that.

Unexpected problem unregistering listener from session event bus

java.lang.IllegalArgumentException: missing event subscriber for an annotated method. Is com.inductiveautomation.perspective.gateway.binding.expression.ExpressionBindingTagListener$SessionEventListener@64bd4089 registered?
at com.google.common.eventbus.SubscriberRegistry.unregister(SubscriberRegistry.java:111)
at com.google.common.eventbus.EventBus.unregister(EventBus.java:201)
at com.inductiveautomation.perspective.gateway.binding.expression.ExpressionBindingTagListener.shutdown(ExpressionBindingTagListener.java:69)
at com.inductiveautomation.ignition.common.expressions.BoundTagExpression.shutdown(BoundTagExpression.java:102)
at com.inductiveautomation.ignition.common.expressions.AbstractExpression.shutdown(AbstractExpression.java:52)
at com.inductiveautomation.ignition.common.expressions.AbstractExpression.shutdown(AbstractExpression.java:52)
at com.inductiveautomation.ignition.common.expressions.FunctionExpression.shutdown(FunctionExpression.java:56)
at com.inductiveautomation.ignition.common.expressions.AbstractExpression.shutdown(AbstractExpression.java:52)
at com.inductiveautomation.ignition.common.expressions.FunctionExpression.shutdown(FunctionExpression.java:56)
at com.inductiveautomation.perspective.gateway.binding.PerspectiveExpression.shutdown(PerspectiveExpression.java:174)
at com.inductiveautomation.perspective.gateway.binding.expression.ExpressionBinding.shutdown(ExpressionBinding.java:61)
at com.inductiveautomation.perspective.gateway.model.AbstractBindingHarness.shutdown(AbstractBindingHarness.java:161)
at com.inductiveautomation.perspective.gateway.model.DesignerPageModel$BindingPreviewSupport.modify(DesignerPageModel.java:132)
at com.inductiveautomation.perspective.gateway.model.DesignerPageModel$DesignerHandlers.lambda$new$8(DesignerPageModel.java:310)
at com.inductiveautomation.ignition.common.util.ExecutionQueue$PollAndExecute.run(ExecutionQueue.java:210)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)

2

Same issue on my system for any screen object that has logic tied to it such as if this then “Running” else “Stopped” or tag + “:” +tag

It look like this error occurs if the same tag is used in a binding expression more then once such as Tag1/Tag1 or Tag1+Tag2/Tag1

3

I had this same issue, with a binding that had multiple references to the same tag.
Reorganizing the binding expression to only reference the tag once seemed to have made the problem go away.

4

We stumbled across the same problem in version 8.1.4 when having multiple references to the same tag on a Perspective component.
Is this the intended behavior or is this a bug? Why do expressions work differently here than they work somewhere else?

5

Yep, i’m running into the same issue.

6

Same issue here, with version 8.1.9

7

We have the same issue with Ignition 8.1.7. Is the IA team working on resolving this or is this an expected behaviour? If it is, is there a reference in the user manual?

8

Hi, no one news about it?

Thx

9

This issue is still persisting. Using Version 8.1.14. Is this going to be addressed by someone from @inductiveautomation?

10

I think I found an issue describing this and the dev work is in progress. I’ll add this thread to the issue.

3 Likes
11

I just started to see this issue.

I am on 8.1.0 though.

Does it stop your reads? I get the issue in the logs, but the binding seems to be working.

12

AFAIK this is resolved as of 8.1.17. I don’t think it made your bindings stop working, it was more a bookkeeping issue when shutting them down, I think.

1 Like