Hi Xiangyu:
Since OEAPI is implemented as COM objects, you would need a Java-COM
bridge.
We do not have any special documentation about this but there are free
and commercial options for
this.
Here is the link to a free option in SourceForge:
http://sourceforge.net/projects/jacob-project/
This is the project's website:
http://danadler.com/jacob/
Thank you for contacting Nektra's OEAPI Support.
Regards,
Federico