ADDITIONAL SYSTEM INFORMATION :
Windows 11, using NetBeans, JDK 19

A DESCRIPTION OF THE PROBLEM :
Please refer to https://github.com/apache/netbeans/issues/5774 for the original post, where I was advised to report this against OpenJDK

Attachments can be found in the above GitHub issue.

When creating a BeanInfo using netbeans, in the getBdescriptor() method, we can set the value "containerDelegate" using the following line of code to delegate to another container.

beanDescriptor.setValue("containerDelegate", "getInnerPanel");
These examples work with all previous JDK versions, except for JDK 19
I also tested JDK 13, 14, 15, 16, 17 and 18 and they all work fine.

REGRESSION : Last worked in version 17.0.6

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Having NetBeans installed, any version, 17 as reference.

Using the Dummy Projects ( From GitHub issue mentioned above)

With any new JPanel, or using MainPanel:

Drag or add a SectionPanel instance to MainPanel
Then add any other widget (i.e. JLabel) from the palette in the SectionPanel instance


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
SectionPanel should be recognized as a Container, therefore the widget should get added into the SectionPanel instance
ACTUAL -
SectionPanel is not recognized as a Container, and no other widget can be added to it when using the widgets palette in NetBeans

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Attached to https://github.com/apache/netbeans/issues/5774
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FREQUENCY : always