Matt Burgess created NIFI-8266:
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Summary: InvokeScriptedProcessor can throw NPE during custom
property validation
Key: NIFI-8266
URL: https://issues.apache.org/jira/browse/NIFI-8266
Project: Apache NiFi
Issue Type: Bug
Components: Extensions
Reporter: Matt Burgess
If a script in InvokeScriptedProcessor (ISP) specifies additional properties to
be added to the configuration dialog, a NullPointerException can occur during
validation:
This appears to be the result of the ValidationContext for the ISP being
created before the script is loaded, and thus the properties are not present in
the context during validation. However the list iterated over in
AbstractConfigurableComponent.validate() is the list of supported property
descriptors, which may or may not include the script's properties when
validate() is called.
The list to be iterated over should be the list of properties in the
ValidationContext, to avoid an NPE. Having said that, for components that can
provide properties dynamically (via script, e.g.) the ValidationContext should
be recreated rather than reusing the first one created. This could be
accomplished with a component annotation (ProvidesCustomProperties or
something). If the annotation exists for the component, the ValidationContext
should be recreated before validation; otherwise, the first one created should
be retained for performance purposes.
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