bbende commented on a change in pull request #4852:
URL: https://github.com/apache/nifi/pull/4852#discussion_r583882100
##########
File path:
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/ExtensionBuilder.java
##########
@@ -463,10 +524,12 @@ private ControllerServiceNode
createGhostControllerServiceNode() {
Thread.currentThread().setContextClassLoader(detectedClassLoader);
final Object extensionInstance = rawClass.newInstance();
+ final T cast = nodeType.cast(extensionInstance);
+ verifyControllerServiceReferences(cast, bundle.getClassLoader());
Review comment:
When testing creating some processors I decided to try adding PutHDFS
since it has `@RequiresInstanceClassLoading`, and it produced a ghost component
with this exception in the logs...
```
Caused by: java.lang.NullPointerException: null
at java.util.ArrayList.<init>(ArrayList.java:178)
at
org.apache.nifi.processors.hadoop.PutHDFS.getSupportedPropertyDescriptors(PutHDFS.java:202)
at
org.apache.nifi.components.AbstractConfigurableComponent.getPropertyDescriptors(AbstractConfigurableComponent.java:247)
at
org.apache.nifi.controller.ExtensionBuilder.verifyControllerServiceReferences(ExtensionBuilder.java:433)
at
org.apache.nifi.controller.ExtensionBuilder.createLoggableComponent(ExtensionBuilder.java:528)
at
org.apache.nifi.controller.ExtensionBuilder.createLoggableProcessor(ExtensionBuilder.java:485)
... 170 common frames omitted
```
I think the issue is that verify is calls
`getSupportedPropertyDescritptors`, but we haven't called `initialize` on the
component yet and we don't know if initialize is what sets up the component's
property descriptors.
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