Errors excecuting a process do not show in UI with docker image.

[noels]

Describe the bug When I running the docker image of the flowable ui, error messages are not correctly displayed in the task app.

I am using the following command to start flowable-ui:

docker run -p 8080:8080 flowable/flowable-ui

I then create a simple process which I expect to raise a runtime exception, e.g. trying to send an email with no recipient.

When I start the process, I see the red error bar pop up but there is no text in the message. When I look a the 500 response from the server, I see that there is no message: property in the returned json.

Expected behavior If instead I run the flowable-ui application in my IDE (I am using Intellij Idea with a spring boot application configuration), then the flowable-ui task application shows the correct error message when a runtime exception is raised.

If I inspect the 500 response from the server I can see that it contains a message: property and a trace: property in the returned json.

Code This 500 response is from flowable running with docker:

{"timestamp":"2022-07-26T10:30:02.002+00:00","status":500,"error":"Internal Server Error","path":"/flowable-ui/app/rest/task-forms/5eeceaec-0ccc-11ed-a089-0242ac110002"}

This 500 response is from flowable running in my IDE: {"timestamp":"2022-07-26T10:38:41.100+00:00","status":500,"error":"Internal Server Error","trace":"org.flowable.common.engine.api.FlowableException: No recipient could be found for sending email\n\tat ...java.base/java.lang.Thread.run(Thread.java:833)\n","message":"No recipient could be found for sending email","path":"/flowable-ui/app/rest/task-forms/34d0311d-09d0-11ed-809e-0242f7c1f792"}

Additional context

I am running the docker image from the flowable repository and I am using the same jre version in my IDE. I imagine there is some configuration parameter preventing the trace and message from being returned but I can't find it and I believe the default behaviour should be to show this message to users running the docker image to test out flowable.