[BUG] NullPointerException when trying to return variables

[pmanu93]

Hi,

When we try to get variables and one of them are of type List with null value(s), the engine throws a NullPointerException, leading to the impossibility of returning any variable.

The problem is happening in the following line:

camunda-spin/dataformat-json-jackson/src/main/java/org/camunda/spin/impl/json/jackson/format/ListJacksonJsonTypeDetector.java

Line 46 in 28099c1

return typeFactory.constructType(object.getClass());

This happens every time we save some variable with the value [null].

Could you guys add the validation to check if object is null before trying to get its class type?
Or instead add some validation to prevent persisting variables in that situation?

Thanks in advance,
Pedro Silva

[niekname]

related to: https://jira.camunda.com/browse/CAM-14331