Yes, it is possible. Because the isCOBOL runtime framework uses a dynamic file handler and the COBFILEIO generated routines rely on that file handler directly.

The generation and compilation of the COBFILEIO OOP COBOL and Java Exception classes is the same as if you were going to access JISAM files.
It is at runtime that you need to set the following property to access the C-tree file system instead of JISAM:

   iscobol.file.index=ctreej

Create an iscobol.properties in that folder and include the following lines in it:

   iscobol.file.index=ctreej
   iscobol.file.prefix=[full path to the test c-tree files folder]

Then use the test-cobfileio.bat under Windows or test-cobfileio.sh under Linux to generate and compile the COBFILEIO classes and run the java test class.

The following screenshot shows how that test can be run. (It has the Javadoc generation commented out to make it simpler.)

1. Where do I get additional information about file status 9D?
2. How do I set up c-tree client/server file access?
3. Why do I get Internal error 19:133:0 when using c-treeRTG?
4. Does c-treeRTG support live backup (without needing to get users off the system)?
5. How do I configure remote file paths when using c-treeACE?
6. Do you have a simple test program to see if c-treeRTG is working?
7. To use encryption do I need to set the c-tree config variable before I run ISMIGRATE?
8. Can I use the same version of c-treeRTG when using different versions of isCOBOL?
9. Why do I get the error message "faircom.rtg.CtreeEnv.ct_config2(IJJ[Ljava/lang/String;)J" when using c-treeRTG?
10. Why do I get 'ct_init ERROR 19:530:0' trying to work with the c-tree Server?