Hierarchy of the layers created using Spire.pdf for Java

[chaitest]

We are trying to create a pdf with 2 layers Sprire pdf for java . The layers are getting created but they are not the top level layers as we expected.
The layers created are under Layer1 when pdf is opened in Adobe Illustrator.(shown in current layers.png)

The hierarchy we are trying to achieve with layering is shown in (expected.png). Please let us know if/how we can achieve this.

Thanks

[Brian.Li]

Hello,

Thanks for your inquiry.
Kindly note that Adobe Illustrator is not a tool specifically used to view PDF documents, it is not based on the PDF Standard to parse PDF documents.
Our Spire.PDF for Java follows PDF Standard. For the PDF file generated by our Spire.PDF, if you open it with a PDF reader tool (e.g. Adobe Reader), it will display layers similar to your first screenshot.

We are sorry that our Spire.PDF is unable to achieve your requirement. If you have any other questions, please feel free to contact us.

Sincerely,
Brian
E-iceblue support team